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Jurnal Iktiologi Indonesia (Indonesian Journal of Ichthyology)
Published by Masyarakat Iktiologi Indonesia
ISSN : 16930339     EISSN : 25798634     DOI : https://doi.org/10.32491
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology
Aims and Scope Aims: Jurnal Iktiologi Indonesia (Indonesian Journal of Ichthyology) aims to publish original research results on fishes (pisces) in fresh, brackish and sea waters including biology, physiology, and ecology, and their application in the fields of fishing, aquaculture, fisheries management, and conservation. Scope: This journal publishes high-quality articles dedicated to all aspects Aquaculture, Fish biodiversity, Fisheries management, Fish diseases, Fishery biotecnology, Moleculer genetics, Fish health management, Fish biodiversity.
Arjuna Subject : Biokimia, Genetika dan Biologi Molekuler - Biokimia, Genetika dan Biologi Molekuler (Lain-Lain)
Articles 420 Documents
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Feed conversion and seed survival of Nile tilapia (Oreochromis. niloticus Linnaeus, 1758) feed by recombinant growth hormone through immersion and feed Nurul Azzahra Lukman; Andi Aliah Hidayani; Asmi Citra Malina; Alimuddin Alimuddin; Muhammad Fuadi
Jurnal Iktiologi Indonesia Vol 22 No 1 (2022): February 2022
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v22i1.568

Abstract

Tilapia (Oreochromis niloticus) is one of the freshwater fish that is of great interest to the public, because its protein content is quite high, namely 55.58%. One of the problems in tilapia cultivation is that the need for feed is very high, where only 25% of the feed given is converted as a result of production and the rest is wasted as waste. This greatly affects the costs in the cultivation business. One alternative to overcome this problem is the use of Recombinant Growth Hormone (rGH). This study aimed to evaluate the effect of rGH administration on feed conversion ratio and survival of Tilapia (O. niloticus) given rGH through a combination method of submersion and feed rGH (oral boosting). The test animals used tilapia seeds with a size of 2-3 cm with 40 days of maintenance. A plastic jar with a volume of 10 L filled with 8 L of water and stocking density of 40 tilapia seeds. Test animals were given feed commercial made feed at a dose of 5% of body weight. This study used a completely randomized design (RAL) consisting of 4 treatments with 3 replications each, namely A (control), B (submersio), C (feed rGH oral boosting), and D (submersio+feed rGH oral boosting). The results showed that the effect of rGH administration gave the best results in treatment D, submersion+ feed rGH (oral boosting), the ratio feed conversion (FCR) was (0.77 ± 0.02) and survival rate was 92.50%. Provision of rGH through the combination method of submersion + feed rGH (oral boosting) can increase the efficiency of good utilization and high survival. Abstrak Recombinant Growth Hormone (rGH) merupakan salah satu metode alternatif untuk mengatasi masalah pertumbuhan dan tingginya kebutuhan pakan dalam budidaya ikan nila. Penelitian ini bertujuan untuk mengevaluasi pertumbuhan, nisbah konversi pakan dan sintasan benih ikan nila (O. niloticus) yang diberikan rGH melalui metode kombinasi perendaman dan pakan buatan. Ikan uji yang digunakan yaitu benih ikan nila ukuran 2-3 cm sebanyak 480 ekor dengan lama pemeliharaan 40 hari. Ikan dipelihara pada wadah plastik bening dengan volume 10 L yang diisi air sebanyak 8 L dengan padat tebar 40 ekor setiap wadahnya. Ikan diberi pakan buatan dengan dosis 5% dari bobot tubuh. Penelitian ini menggunakan rancangan acak lengkap yang terdiri atas 4 perlakuan dengan masing-masing 3 ulangan, yaitu A (kontrol), B (perendaman), C (pakan), dan D (kombinasi perendaman + pakan). Aplikasi rGH ke pakan buatan komersil dengan dosis 30 mL rGH dalam satu kg pakan, sementara untuk perendaman dengan dosis 100 mL larutan rGH untuk 120 ekor ikan dalam 10 L air. Hasil penelitian menunjukkan bahwa perlakuan perendaman + pakan rGH memberikan hasil yang terbaik, yaitu pertumbuhan spesifik sebesar 5,29 %/hari, nisbah konversi pakan sebesar (0,77 ± 0,02) dan sintasan 92,50%. Pemberian rGH dengan kombinasi perendaman dan oral berpotensi dalam meningkatkan produktivitas dan efisiensi biaya dalam budidaya ikan nila.
Color quality, behavioral response, and blood glucose levels of guppies Poecilia reticulata (Peters, 1859) with the addition of Indian almond leaves (Terminalia catappa) in fish containers Izhar Amirul Haq; Kukuh Nirmala; Yuni Puji Hastuti; Eddy Supriyono
Jurnal Iktiologi Indonesia Vol 22 No 1 (2022): February 2022
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v22i1.581

Abstract

Guppies are ornamental fish that have economic value and can be cultivated. One of the problems in guppies cultivation is the poor quality of body color. The solution to this problem is to improve the environmental quality in guppy aquaculture. This study evaluates changes in color quality, behavioral response, and blood glucose levels of guppies using water immersion of Indian almond leaves on rearing media. Study was carried out using a completely randomized design consisting of five treatments. The rearing media was filled water with a total volume of 10 L from each treatment with different concentrations, namely, Control treatment (100% freshwater), A (75% freshwater + 25% Indian almond leaf water), B (50% freshwater + 50% Indian almond leaf), C (25% freshwater + 75% Indian almond leaf) and D (100% Indian almond leaf). Each treatment observed several test parameters such as color quality percentage, survival rate, chromatophores cells number, behavior, glucose levels, and the water physical-chemical parameters. Guppies' behavioral responses, in general, experienced an increasing change in each treatment for seven days. The highest color quality percentage by treatment D was 73.93±2.29%, and the highest glucose level was by the control treatment, which was 24.11±0.41 mg dL-1. The results of variance analysis showed that the water immersion of Indian almond leaves was significantly different on color quality, behavioral response, and blood glucose levels through Duncan's test (p<0.05). Abstrak Ikan guppy termasuk ikan hias yang memiliki nilai ekonomis dan dapat dibudidayakan. Salah satu masalah dalam budidaya ikan guppy yaitu kualitas warna tubuhnya yang tidak bagus. Upaya yang dapat dilakukan yaitu memperbaiki lingkungan budidaya ikan guppy. Studi ini bertujuan untuk mengevaluasi perubahan kualitas warna, respons tingkah laku, dan kadar glukosa ikan guppy menggunakan rendaman air daun ketapang pada media pemeliharaan. Evaluasi ini dilakukan dengan menggunakan rancangan acak lengkap yang terdiri atas lima perlakuan. Media pemeliharaan diisi air dengan total volume 10 L dari setiap perlakuan dengan konsentrasi yang berbeda yaitu, perlakuan Kontrol (100% air tawar), A (75% air tawar + 25% air daun ketapang), B (50% air tawar + 50% air daun ketapang), C (25% air tawar + 75% air daun ketapang) dan D (100% air daun ketapang). Setiap perlakuan diamati beberapa parameter uji seperti persentase kualitas warna, tingkat sintasan, jumlah sel kromatofora, tingkah laku, kadar glukosa, dan parameter fisik kimiawi perairan. Respons tingkah laku ikan guppy secara umum mengalami perubahan yang meningkat dalam setiap perlakuan selama tujuh hari. Persentase kualitas warna tertinggi pada perlakuan D yaitu sebesar 73,93±2,29% dan nilai kadar glukosa tertinggi pada perlakuan Kontrol yaitu 24,11±0,41 mg dL-1. Hasil analisis sidik ragam menunjukkan bahwa rendaman air daun ketapang berbeda nyata terhadap kualitas warna, respons tingkah laku dan kadar glukosa darah melalui uji Duncan (p0,05).
The relationship between small pelagic fish catches with sea surface temperature and chlorophyll in Makassar Strait waters Rini Sahni Putri; Hasrianti Hasrianti; Damis Damis; Muhammad Bibin; Andi Rani Sahni Putri; Muh Kasim; Suhartono Nurdin
Jurnal Iktiologi Indonesia Vol 22 No 1 (2022): February 2022
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v22i1.582

Abstract

Makassar Strait is a waters area with a large and relatively fertile water resource potential. The Makassar Strait area represents the confluence zone between the Pacific Ocean and Indian Ocean fish populations. The fertility of the waters makes this area one of the breeding zones for most aquatic biota. This study aims to map the catch of small pelagic fishes with water conditions in the Makassar Strait. The data used in this study was fish catches data from Makassar Strait waters from June to September 2021. Data on environmental conditions in the form of Sea Surface Temperature and chlorophyll-a concentration in the waters during the study period were obtained from the AQUA satellite with MODIS sensors, then combined with the Geographic Information System (GIS). The results of this study indicate that the sea surface temperature range in Makassar Strait waters was between 26.7°C–31.3°C and the concentration of chlorophyll-a was between 0.7 mg/m³ - 1.30 mg/m³. The highest catch points were at two points with the same catch of the purse seine, namely 4,000 kg at 118°51'E and 5°10'59"S and at 118°52'59"E and 5°3'S, while the lowest catch was 5 kg at 118°19'E and 4°57'S. It can be concluded that the presence of fish may be influenced by the water’s conditions favored by the target fish in the Makassar Strait. Abstrak Selat Makassar merupakan kawasan perairan yang memiliki potensi sumberdaya perairan yang cukup besar dan relatif subur. Kawasan Selat Makassar merepresentasikan zona pertemuan antara populasi ikan Samudera Pasifik dan Samudera Hindia. Kesuburan perairannya menjadikan daerah ini sebagai salah satu zona berkembang biak bagi sebagian besar biota perairan. Penelitian ini bertujuan untuk memetakan hasil tangkapan ikan pelagis kecil dengan kondisi perairan di Selat Makassar. Data yang digunakan dalam penelitian ini merupakan data tangkapan ikan dari Perairan Selat Makassar pada bulan Juni-September 2021. Data kondisi lingkungan perairan berupa Suhu Permukaan Laut dan konsentrasi klorofil-a perairan pada periode penelitian diperoleh dari satelit AQUA dengan sensor MODIS, kemudian dikombinasikan dengan Sistem Informasi Geografis. Hasil penelitian ini menunjukkan bahwa kisaran suhu permukaan laut di Perairan Selat Makassar antara 26,7°C–31,3°C dan konsentrasi klorofil-a antara 0,7 mg/m³ - 1,30 mg/m³. Titik tangkapan tertinggi terdapat pada dua titik dengan hasil tangkapan pukat cincin yang sama yaitu 4000 kg pada 118°51’BT dan 5°10’59”LS serta pada titik 118°52’59”BT dan 5°3’LS, sedangkan tangkapan terendah sebanyak 5 kg pada titik 118°19’BT dan 4°57’LS. Disimpulkan bahwa keberadaan ikan kemungkinan dipengaruhi oleh kondisi perairan yang disukai ikan target tangkapan di Selat Makassar.
The effect of microorganisms combination as probiotics in feed for growth performance, gastric evacuation rates, and blood glucose levels of milkfish, Chanos chanos (Forsskal, 1775) Siti Aslamyah; Zainuddin Zainuddin; Badraeni Badraeni
Jurnal Iktiologi Indonesia Vol 22 No 1 (2022): February 2022
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v22i1.583

Abstract

The use of combinations of microorganisms as feed additives can synergize to produce enzymes to help the digestive process of feed. This study aims to determine the best combination of microorganisms as probiotics in feeding on growth performance, gastric evacuation, and blood glucose levels of milkfish. Milkfish with an initial weight of 9.21±0.14 g, reared at a density of 20 fish in an aquarium measuring 50 x 40 x 35 cm3 containing 48 L of water with 20 ppt salinity and equipped with a recirculation system. The research design was Completely Randomized Design with five treatments, namely: control (feed without microorganisms), Bacillus sp. and Lactobacillus sp., Rhizophus sp. and Aspergillus sp., Saccharomyces sp. and Trichoderma sp., and Mixed microorganisms, Bacillus sp., Lactobacillus sp., Rhizophus sp., Aspergillus sp., Saccharomyces sp., and Trichoderma sp. During 50 days of rearing, the fish were given experimental feed three times a day at 07.00, 12.00, and 15.00 at 5% body weight. The results showed that the treatment significantly affected growth, feed efficiency, and hepatosomatic index. However, it did not affect milkfish's survival and liver and muscle glycogen levels. Absolute growth (30.79±0.87 g), relative growth rate (333.91±5.83%), biomass growth (615.76±17.48%), feed efficiency (57.26±0.39 %), and the best hepatosomatic index (0.99±0.01) were obtained in the mixed microorganism treatment, and mg/g, and muscle 5.45-5.72 mg/g. The gastric evacuation rate and the fastest peak and peak decrease in blood glucose levels were obtained in the mixed microorganisms treatment at 5 and 3-4 hours postprandial. The diverse microorganisms can be added to the feed at a dose of 10 mL/kg to support the intensification of milkfish culture Abstrak Pemanfaatan kombinasi mikroorganisme sebagai aditif pakan dapat saling bersinergi menghasilkan enzim untuk membantu proses pencernaan pakan. Penelitian ini bertujuan menentukan kombinasi mikroorganisme terbaik sebagai probiotik dalam pakan terhadap kinerja pertumbuhan, laju pengosongan lambung, dan kadar glukosa darah ikan bandeng. Ikan bandeng dengan bobot awal 9,21±0,14 g dipelihara dengan kepadatan 20 ekor pada akuarium berukuran 50 x 40 x 35 cm3 yang berisi 48 L air bersalinitas 20 ppt dan dilengkapi sistem resirkulasi. Penelitian didesain dalam rancangan acak lengkap dengan lima perlakuan, yaitu: kontrol (pakan tanpa mikroorganisme), Bacillus sp. dan Lactobacillus sp., Rhizophus sp. dan Aspergillus sp., Saccharomyces sp. dan Trichoderma sp., serta kombinasi mikroorganisme Bacillus sp., Lactobacillus sp., Rhizophus sp., Aspergillus sp., Saccharomyces sp., dan Trichoderma sp. Selama 50 hari pemeliharaan, ikan diberi pakan percobaan 3 kali sehari yakni pukul 07.00, 12.00, dan 15.00 sebanyak 5% dari bobot badan. Hasil penelitian menunjukkan bahwa perlakuan berpengaruh nyata terhadap pertumbuhan, efisiensi pakan, dan indeks hepatosomatik. Namun, tidak berpengaruh terhadap sintasan, kadar glikogen hati dan otot ikan bandeng. Pertumbuhan mutlak (30,79±0,87 g), laju pertumbuhan relatif (333,91±5,83%), pertumbuhan biomassa (615,76±17,48%), efisiensi pakan (57,26±0,39%), dan indeks hepatosomatik (0,99±0,01) terbaik diperoleh pada perlakuan kombinasi mikroorganisme dan terendah pada kontrol. Kisaran sintasan yang dihasilkan 93,33-100%, glikogen hati 6,60-6,89 mg/g, dan otot 5,45-5,72 mg/g. Laju pengosongan lambung, serta mencapai puncak dan penurunan puncak kadar glukosa darah tercepat pada perlakuan kombinasi mikroorganisme pada jam ke 5 dan jam ke 3-4 post prandial. Untuk mendukung intensifikasi budidaya ikan bandeng, kombinasi mikroorganisme dapat ditambahkan dalam pakan dengan dosis 10 mL/kg pakan.
The evaluation of glutamine supplementation into the diet on the growth performance, intestinal structure and function of striped catfish Pangasius hypophthalmus (Sauvage, 1878) fry Uttari Dewi; Dedi Jusadi; Mia Setiawati; Sri Nuryati
Jurnal Iktiologi Indonesia Vol 22 No 1 (2022): February 2022
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v22i1.598

Abstract

A triplicate experiment was conducted to evaluate the effect of glutamine supplementation in the diet on the structure and function of intestine and the growth performance of striped catfish Pangasius hypopthalmus. Forty fishes with an initial body weight of 0.82 ± 0.01 g were distributed into a rectangular aquarium with a size of 60×50×40 cm and a water volume of 70 L. Fish were fed on the diet supplemented with glutamine of either 0, 1, 2, or 3%, respectively. Fish were fed on the diet at satiation for 60 days. Results showed that fish fed on the diet supplemented with 1, and 2% of glutamine significantly had the highest growth performance, including specific growth rate, protein retention, and feed efficiency. On the other hand, feeding on a diet supplemented with 3% of glutamine did not significantly affect the growth performance of fish. Fish in 1% and 2% glutamine treatments had better structure and function of intestine than two other groups of fish, namely the ratio of intestine length with body length, villus surface area, and protease enzyme activity. Thus, supplementation of 1% and 2% glutamine in the diet improves the structure and function of intestine and the growth performance of striped catfish. Abstrak Percobaan dilakukan untuk mengevaluasi pengaruh penambahan glutamin pada pakan terhadap struktur dan fungsi usus, serta kinerja pertumbuhan ikan patin Pangasius hypopthalmus. Ikan uji yang digunakan sebanyak 40 ekor dengan bobot awal 0,82 ± 0,01 g dipelihara dalam akuarium berukuran 60 × 50 × 40 cm dan volume air 70 L. Ikan diberi pakan uji dengan penambahan glutamin 0, 1, 2, dan 3%. Ikan diberi pakan uji secara at satiation selama 60 hari. Hasil penelitian menunjukkan bahwa ikan yang diberi pakan dengan penambahan glutamin 1% dan 2% secara signifikan menghasilkan kinerja pertumbuhan tertinggi, termasuk laju pertumbuhan spesifik, retensi protein, dan efisiensi pakan. Di sisi lain, pakan yang ditambah dengan glutamin 3% tidak signifikan memengaruhi kinerja pertumbuhan ikan. Ikan uji pada perlakuan glutamin 1% dan 2% menghasilkan struktur dan fungsi usus yang lebih baik dibanding perlakuan lainnya, yakni rasio panjang usus dengan panjang tubuh, luas permukaan vili dan aktivitas enzim protease. Disimpulkan bahwa penambahan glutamin 1% dan 2% pada pakan meningkatkan struktur dan fungsi usus serta kinerja pertumbuhan benih ikan patin.
Community structure and genetic variation of freshwater fishes in stream and standing water in the Brantas River, Malang Regency Restu Fitriani; Fatchur Rohman; Mohamad Amin
Jurnal Iktiologi Indonesia Vol 22 No 2 (2022): June 2022
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v22i2.586

Abstract

Anthropogenic activities along the Brantas River may affect the community structure and cause changes in the genetic variation of native fishes. This study aimed to analyze and compare the community structure and the genetic diversity of fishes in the standing and streamwater areas of the Brantas River. The sampling method was purposive sampling and fish samples were collected using a gill net with a horizontal transect technique. Genetic variation analysis was conducted through DNA isolation, PCR, amplification, and sequencing. A total of 14 fish species represented six families namely Chanidae, Cyprinidae, Cichlidae, Butidae, Channidae, and Mastacembelidae were recorded. Fish community structure was categorized as a moderate level of diversity with values of 1.62 and 1.88; moderate evenness with values of 0.61 and 0.75; low species richness with values of 1.86 and 1.69; and low dominance with values of 0.34 and 0.19. The Hutcheson’s T-test found significant differences in the diversity between standing water and stream water locations. The results of genetic variation analysis using the COI gene in low-abundance fish species obtained genetic differences in the Mystacoleucus marginatus sequence in standing water, shown by the substitution of three nucleotides bases at 363, 381, and 601. Meanwhile, Macrognathus aculeatus samples from this study had a 99% nucleotide similarity percentage with Macrognathus aculeatus samples in the GenBank. Abstrak Aktivitas antropogenik yang dilakukan di Sungai Brantas dapat memengaruhi struktur komunitas dan menyebabkan perubahan variasi genetik ikan asli Sungai Brantas. Penelitian ini bertujuan untuk menganalisis dan membandingkan struktur komunitas ikan, serta membedakan variasi genetik ikan di daerah mengalir dan menggenang Sungai Brantas. Metode pengambilan sampel untuk struktur komunitas secara purposive sampling menggunakan alat tangkap jaring insang dengan teknik transek horizontal. Analisis variasi genetik dengan cara isolasi DNA, PCR, amplifikasi, dan skuensing. Penelitian ini berhasil memperoleh 14 jenis ikan dari enam suku, yaitu Chanidae, Cyprinidae, Cichlidae, Butidae, Channidae, dan Mastacembelidae. Struktur komunitas di Sungai Brantas Kabupaten Malang dapat dikategorikan dengan tingkat keanekaragaman sedang dengan nilai 1,62 dan 1,88, kemerataan yang sedang dengan nilai 0,61 dan 0,75, kekayaan jenis rendah dengan nilai 1,86 dan 1,69, serta dominasi yang rendah dengan nilai 0,34 dan 0,19. Berdasarkan hasil uji t-Hutcheson diperoleh perbedaan yang signifikan pada indeks keanekaragaman antara lokasi mengalir dan menggenang. Hasil analisis variasi genetik menggunakan gen COI pada jenis ikan berkelimpahan rendah diperoleh perbedaan genetik pada sekuen Mystacoleucus marginatus di lokasi menggenang yang ditandai dengan adanya substitusi pada tiga basa nukleotida yaitu pada basa ke 363, 381, dan 601. Sampel Macrognathus aculeatus dan penelitian ini memiliki persentase kesamaan 99% dengan sampel Macrognathus aculeatus pada GenBank.
Pre-settlement small pelagic larvae in Ambon Bay based on length distribution Grace Hutubessy
Jurnal Iktiologi Indonesia Vol 22 No 2 (2022): June 2022
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v22i2.649

Abstract

Larval occurrence in Ambon Bay is related to the larval settlement and indirectly affects the population of pelagic species which have nursery ground in Ambon Bay. The objective of this study is to analyze the factors that influence larval fish occurrence in Ambon Bay based on the length distribution. A lift net assisted by 6 LED lights was operated during the dark to catch larval fish and data was collected from 2016-2018 at Hative Besar, Ambon City. Length frequency with a 5 mm interval was set following the sampling dates. Two variables: length frequency and the number of new individuals (<20mm) together with information on tides and moon phase obtained from the website were collected for further analysis. The larval occurrence was associated with 4 moon phases (dark, first quarter, full and third quarter) and with 2 types of tides: semi-diurnal and mixed semi-diurnal. The normality test (Kolmogorov–Smirnov test) showed normal distribution on length data and the ANOVA showed no significant difference in larval occurrence among the moon phases (F=1.223, P=0.318) but between semi-diurnal and mixed semi-diurnal, and larval recruitment was significantly different (F=3.07; P=0.003), small size larvae were abundance during semi-diurnal tides while large larvae during mixed semi-diurnal tides. It is concluded that small pelagic larval occurred throughout the year and the new cohort occurred by the influence of the tidal current to Ambon bay. Our findings highlight the biological impacts of lift net siru-siru as priorities for the management of fisheries in Ambon bay. Abstrak Pola kehadiran larva ikan di Teluk Ambon berkaitan erat dengan proses menetap dan secara tidak langsung berkaitan juga dengan dinamika populasi ikan pelagis yang memilih daerah pembesaran di dalam Teluk Ambon. Penelitian ini bertujuan untuk menganalisis faktor lingkungan yang memengaruhi kehadiran pra-menetap larva ikan pelagis kecilberdasarkan frekuensi panjang. Larva ikan ditangkap dengan menggunakan siru-siru dengan bantuan lampu di malam hari. Sampling dilaksanakan dari tahun 2016 hingga 2018 di Negeri Hative Besar, Ambon. Frekuensi panjang total larva ditabulasi dalam bentuk histogram dengan kisaran 5 mm untuk setiap tanggal sampling. Dua variabel: panjang dan jumlah individu baru (≤ 20mm) bersama dengan hari bulan dan pasang surut digunakan untuk analisis selanjutnya. Kehadiran larva dihubungkan dengan hari bulan (4 fase: bulan baru, kwartir pertama, purnama dan kwartir terakhir) dan tipe pasang surut (harian ganda dan tipe campuran). Uji normalitas Kolmogorov–Smirnov test menunjukkan sebaran data panjang normal (P=0.20). Selanjutnya hasil ANOVA menunjukkan kehadiran pra-menetap larva di Teluk Ambon tidak dipengaruhi hari bulan (F=1,223, P=0,318), tetapi dipengaruhi oleh pasang surut (F=3,07; P=0,003) ketika larva berukuran kecil lebih banyak tertangkap pada tipe harian ganda, sedangkan larva yang lebih besar pada tipe campuran. Kehadiran pra-menetap larva ikan pelagis kecil terjadi sepanjang tahun dan kehadiran individu baru di Teluk Ambon dipengaruhi oleh arus pasang surut. Hasil penelitian ini menyorot dampak biologis dari perikanan siru-siru sebagai prioritas pengelolaan perikanan di Teluk Ambon.
Ichthyofauna from southwest coast of Bali Nyoman Dati Pertami; Prawira ARP Tampubolon; I Nyoman Y Parawangsa; Muhammad Bisma
Jurnal Iktiologi Indonesia Vol 22 No 2 (2022): June 2022
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v22i2.650

Abstract

The southwest coast of Bali is part of the waters of the Bali Strait. Information regarding ichthyofauna diversity around southwest coast of Bali is not yet done. This study aims to reveal the Ichthyofauna of fish in the waters of the southwest coast of Bali. The study was conducted from April 2017 to May 2018 at three sampling stations including the waters of Pengambengan and Pekutatan (Jembrana Regency), with waters of Yeh Leh (Tabanan Regency). Fish are caught using gill nets and ring trawls. This study succeeded in identifying 43 species of fish representing 24 families. Most types of fish caught are Goldstripe sardinella (Sardinella gibbosa) (36%), Shortfin scad (Decapterus macrosoma) (20%), Bali sardinella (Sardinella lemuru) (16%), and Bullet tuna (Auxis rochei) (7%). Abstrak Pantai barat daya Bali merupakan bagian dari kawasan perairan Selat Bali. Informasi terkait iktiofauna di pantai barat daya Bali belum pernah dilakukan. Penelitian ini bertujuan untuk mengungkap keberagamana ikan di perairan pantai barat daya Bali. Penelitian dilakukan pada bulan April 2017 hingga Mei 2018 di tiga stasiun pengambilan sampel meliputi perairan Pengambengan dan Pekutatan (Kabupaten Jembrana), serta perairan Yeh Leh (Kabupaten Tabanan). Ikan ditangkap dengan menggunakan jaring insang dan pukat cincin. Penelitian ini berhasil mengidentifikasi 43 jenis ikan yang mewakili 24 famili. Jenis ikan yang paling banyak tertangkap adalah tamban (Sardinella gibbosa) (36%), layang (Decapterus macrosoma) (20%), lemuru (Sardinella lemuru) (16%), dan tongkol (Auxis rochei) (7%).
Growth pattern and condition factor of the common silver-biddy Gerres oyena (Forsskål, 1775) juveniles from seagrass ecosystem of Karang Congkak Island, Kepulauan Seribu Adinda Kurnia Putri; Charles P.H Simanjuntak; M. Faris Nazal; Noviana Noviana; Endang Hilmi; Nabela Fikriyya; Ahmad Zahid
Jurnal Iktiologi Indonesia Vol 22 No 2 (2022): June 2022
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v22i2.651

Abstract

A seagrass bed of Karang Congkak Island has been known as the nursery habitat for many marine fishes. The common silver-biddy (Gerres oyena) is one of the temporary resident fishes that inhabits seagrass beds of Karang Congkak Island before they migrate to their adult habitat to join the adult population. The aims of this research are to analyze the growth pattern, condition factor and food preferences of the common silver-biddy while they utilized the seagrass beds of Karang Congkak Island as their nursery ground. Sampling was conducted from March 2018 to March 2019 with 10 times frequency of sampling in total. Sample was towed using a beach seine net with 10x1 m in dimension and 3 mm mesh size. Parameters that were analyzed in this research were a length-weight relationship, condition factor, and food preferences. A total of 2762 juveniles of the common silver-biddy were collected and were classified into 10 length classes. The results showed that in general, the growth pattern of the common silver-biddy was positive allometric (b>3), although some months were isometric (b=3). The overall condition factor ranged from 0.87 – 2,05 and it fluctuated throughout the months. The diet which has the main role in determining the fish growth of the common silver-biddy was dominated by the group of copepods. The positive allometric growth pattern of the common silver-biddy and the high value of condition factor describe that seagrass ecosystem of Karang Congkak Island is a suitable nursery ground for the juveniles of the common silver-biddy. Abstrak Ekosistem lamun Pulau Karang Congkak merupakan habitat pengasuhan yuwana berbagai spesies ikan laut. Ikan kapas-kapas (Gerres oyena) merupakan salah satu ikan penghuni sementara lamun Pulau Karang Congkak sebelum akhirnya beruaya ke habitat induknya untuk bergabung dengan populasi ikan dewasa. Penelitian ini bertujuan untuk menganalisis pola pertumbuhan dan faktor kondisi yuwana ikan kapas-kapas selama menghuni perairan ekosistem lamun Pulau Karang Congkak. Penelitian dilakukan dari Maret 2018 sampai Maret 2019 dengan total frekuensi pengambilan sampel selama 10 bulan. Contoh ikan diambil dengan menarik pukat tarik pantai berdimensi 10 m x1 m dan mata jaring 3 mm. Parameter yang diamati pada penelitian ini adalah hubungan panjang-bobot ikan, faktor kondisi, dan preferensi makanan ikan. Selama penelitian terkumpul sebanyak 2765 yuwana ikan yang dapat dikelompokkan menjadi 10 kelompok kelas ukuran panjang. Pola pertumbuhan panjang ikan kapas-kapassecara keseluruhan bertipe alometrik positif (b > 3), namun pada beberapa bulan tertentu ditemukan pola pertumbuhan isometrik (b=3). Faktor kondisi selama penelitian berkisar antara 0,87-2,05 dan berfluktuasi setiap bulan. Makanan ikan yang merupakan faktor penentu pertumbuhan ikan kapas-kapas didominasi oleh kelompok kopepoda. Pola pertumbuhan ikan kapas-kapas yang alometrik positif dengan faktor kondisi yang tinggi memberikan gambaran bahwa padang lamun Pulau Karang Congkak merupakan daerah asuhan yang baik bagi yuwana ikan kapas-kapas.
Feeding preferences and diet overlap of sciaenids fishes in Pabean Bay, Indramayu Charles P. H. Simanjuntak; Kustiyani Kustiyani; Ridwan Affandi; M. Fadjar Rahardjo; Tri Prabowo
Jurnal Iktiologi Indonesia Vol 22 No 2 (2022): June 2022
Publisher : Masyarakat Iktiologi Indonesia (Indonesian Ichthyological Society)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32491/jii.v22i2.652

Abstract

The trophic ecology of Sciaenid fishes, one group of the demersal fishes in Pabean Bay, Indramayu is described in our study. A total of 14 types of prey were identified belonging to three groups (Decapod Crustacean, Mollusca, and Bony fishes) to analyze the feeding preferences and diet breadth overlap. The preferred prey items of Johnius belangerii (Belanger's croaker) were Calappidae (Ii = 16.12), followed by Squilla sp. (15.5), and Penaeus sp. (14.6); while Johnius borneensis (Sharpnose hammer croaker) were Penaeus sp. (Ii = 86.5), followed by Calappidae (3.45), and Acetes sp. (1.38); Johnius macropterus (Largefin croaker) were Penaeus sp. (Ii = 35), followed by Callapidae (5); Nibea soldado (Soldier croaker) were Penaeus sp. (Ii = 25.63) followed by Squilla sp. (23.98), and Charybdis sp. (16.42); Otolithes ruber (Tigertooth croaker) was Penaeus sp. (Ii = 25.63). The diet breadth (BA) values indicate that Sharpnose hammer croaker (BA = 0.06) and Tigertooth croaker (BA = 0.07) are high specialist consumers, while Belanger's croaker (BA = 0.36) and Soldier croaker (BA =0.34) are considered as non-specialized feeders. Our study showed that sciaenid fishes have overlapping trophic niches intra and inter-specific due to their common feeding on decapod crustaceans. The high trophic overlap between predators suggests that Sciaenid fishes in Pabean Bay are competing with each other when food resources are limited. Abstrak Ekologi trofik famili Sciaenidae, salah satu kelompok ikan demersal di perairan Teluk Pabean, Indramayu dideskripsikan melalui studi ini. Sebanyak 14 jenis makanan dari tiga kelompok utama (Krustasea Decapoda, Moluska, dan ikan bertulang sejati) berhasil diidentifikasi untuk analisis preferensi dan tumpang tindih relung makanan ikan Sciaenidae. Mangsa yang diminati oleh ikan Johnius belangerii (Belanger's croaker) adalah Calappidae (Ii = 16,12), diikuti oleh Squilla sp. (15,5), dan Penaeus sp. (14,6); sementara ikan Johnius borneensis (Sharpnose hammer croaker) menyukai Penaeus sp. (Ii = 86,5), disusul oleh Calappidae (3,45), dan Acetes sp. (1,38); ikan Johnius macropterus (Largefin croaker) menyenangi Penaeus sp. (Ii = 35), diikuti oleh Callapidae (5); sedangkan ikan Nibea soldado (Soldier croaker) cenderung memilikih Penaeus sp. (Ii = 25,63), Squilla sp. (23,98), dan Charybdis sp. (16,42); sedangkan Otolithes ruber (Tigertooth croaker) lebih banyak mengonsumsi Penaeus sp. (Ii = 25,63). Nilai relung makanan (BA) mengindikasikan bahwa ikan Sharpnose hammer croaker (BA = 0,06) dan Tigertooth croaker (BA = 0,07) adalah termasuk pemangsa yang spesialis, sedangkan Belanger's croaker (BA = 0,36) dan Soldier croaker (BA = 0,34) lebih cenderung sebagai pemangsa yang bukan spesialis. Tumpang tindih relung makanan khususnya jenis krustasea decapoda terjadi baik antarspesies maupun antar individu dari spesies yang sama, termasuk antar kelompok ukuran. Tumpang tindih relung makanan yang tinggi antar ikan predator menunjukkan bahwa kelompok ikan Sciaenidae di Teluk Paben berkompetisi memperebutkan makanan saat terjadi kelangkaan sumberdaya makanan.

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