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Keanekaragaman Jenis Burung Air di Hutan Mangrove Karang Sewu, Gilimanuk, Bali. Dhira Alfiah R. Pettalolo; Ni Luh Watiniasih; Alfi Hermawati Waskita Sari
Current Trends in Aquatic Science Vol 3 No 2 (2020)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Water bird is a bird species that most of their lives depend on water for their habitat. The purpose of this research was to find out the types of waterbirds that are often encountered, the diversity of waterbird species and the types of water birds that are protected based on the IUCN Red List that found in Karang Sewu Mangrove Forest, Bali. The birds are identified and counted twice a day, from 07.00-09.00 am and from 04.00-06.00 pm. There were 11 species of waterbirds were found belong to 7 families, with a total of 181 individuals. The species of water bird whcih often found was the Trinil Bedaran (Xenus cinereus), followed by the Trinil Ekor Kelabu (Tringa brevipes) and the Cekakak Sungai (Todiramphus chloris). The species diversity index (H’) on Burung Island and Kalong Island was classified as medium, while in Gadung Island it was classified as low. All species of water birds found in Karang Sewu Mangrove Forest are included in the IUCN Red List, there are eight species of birds in Least Concern (LC) category consisting of Cangak Laut (Ardea sumatrana), Cangak Australia (Ardea novaehollandae), Cekakak Sungai (Todiramphus chloris), Cerek Asia (Charadrius veredus), Dara Laut Jambul Besar (Thalasseus bergii), Kokokan Laut (Butorides striata), Kowak Malam Merah (Nycticorax caledonicus) and Trinil Bedaran (Xenus cinereus), one species in Near Threatened (NT) category is Bangau Tong-Tong (Leptoptilos javanicus) and two species are in the Vulnerable (VU) category, namely Trinil Ekor Kelabu (Tringa brevipes) and Wili-Wili (Esacus neglectus).

Keanekaragaman Jenis Krustasea Kelas Malacostraca di Kawasan Mangrove Pulau Serangan, Denpasar, Bali Daniel Tri Lakona Sinamo; I Wayan Arthana; Ni Made Ernawati
Current Trends in Aquatic Science Vol 3 No 2 (2020)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Penelitian ini bertujuan untuk mengetahui keanekaragaman dan jenis Krustasea kelas Malacostraca di kawasan mangrove Pulau Serangan, Bali. Lokasi penelitian dibagi menjadi 3 stasiun, setiap stasiun terdiri dari 3 titik penelitian dan pengulangan sampling dilakukan sebanyak 3 kali. Penelitian ini dilakukan selama satu bulan pada bulan November-Desember 2018. Metode yang digunakan untuk pengambilan sampel adalah metode transek 1x1 m. Data yang diperoleh dianalisis secara deskriptif kuantitatif. Hasil penelitian mendapatkan 318 individu Krustasea dengan komposisi 5 famili dan 19 spesies yaitu Clibanarius infraspinatus, Clibanarius longitarsus, Diogenes avarus, Metopograpsus latifrons, Macrophthalmus definitus, Macrophthamus laevimanus, Macrophthalmus tomentosus, Uca bellator, Uca coarctata, Uca crassipes, Uca dussumieri, Uca jocelynae, Uca perplexa, Uca rosea, Uca triangularis, Uca vocans, Scylla serrata, Thalamita crenata, Thalassina anomala. Nilai kelimpahan Krustasea kelas Malacostraca yang didapatkan pada stasiun 1 sebesar 47 ind/m2, stasiun 2 sebesar 27 ind/m2, stasiun 3 sebesar 33 ind/m2. Indeks keanekaragaman Krustasea di kawasan mangrove Pulau Serangan berkisar antara 1,38 sampai 1,88 yang tergolong kategori keanekaragaman sedang. Nilai keseragaman Krustasea berkisar antara 0,93 hingga 0,95 dan tergolong keseragaman tinggi, sementara indeks dominansi Krustasea termasuk dominansi rendah dengan nilai indeks 0,18-0,22. Parameter perairan yang diukur pada lokasi penelitian berupa suhu berkisar 29,37-30,52°C, salinitas perairan berkisar 27,82-29,18 ppt, pH perairan berkisar 7,48-6,61, DO perairan berkisar 5,26-6,09 mg/l. Berdasarkan hasil yang diperoleh berupa indeks diversitas, kelimpahan serta parameter perairan kawasan mangrove Pulau Serangan masih cukup baik dan stabil untuk mendukung keberlangsungan hidup biota Krustasea kelas Malacostraca.

Pengaruh Ekstrak Daun Cincau Hijau (Cyclea barbata Miers) Terhadap Infeksi Bakteri Aeromonas hydrophila Pada Ikan Nila (Oreochromis niloticus) Aristiani Rusdi Oktaviyanti; Pande Gde Sasmita Julyantoro; Dewa Ayu Angga Pebriani
Current Trends in Aquatic Science Vol 3 No 2 (2020)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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This study aims to determine the ability of green grass jelly leaf extract in inhibiting the growth of Aeromonas hydrophila and improving the survival of Tilapia (Oreocrhomis niloticus). This research was conducted at Fisheries Laboratory of Udayana University and UPT Laboratory of Biosciences and Biotechnology of Udayana University from May to August 2019. This experiments were use a completely randomized design (CRD) with three replications for each treatment. Antibacterial activity test was conducted in vitro with five different concentration, namely 1,25%, 2,5%, 5%, 7,5% and 10%. The challenge test was conducted in vivo with five treatments, namely A, B, C, D and E. The research showed that the green grass jelly leaf extract can inhibit the growth of Aeromonas hydrophila in vitro at the smallest concentration (1,25%) and the stronger inhibition capability at higher concentrations. Green grass jelly leaf extract also improve the survival of tilapia fish when infected by Aeromonas hydrophila in the challenge test with a higher survival rate of 76,7% compared to those without green grass jelly leaf extract addition with a survival value of only 46,7%. The quality of water measured during the study such a temperature ranging from 27,7-28?C, pH 7,2 to 7,5, and DO 5,5 to 6,7 ppm. The value of water quality is still in the optimal range for the life of Tilapia. Keywords: Extract; green grass jelly; phatogen

The Struktur Komunitas Echinodermata di Area Padang Lamun Pantai Samuh, Kecamatan Kuta Selatan, Kabupaten Badung Fina Wahyuningsih; I Wayan Arthana; Suprabadevi Ayumayasari Saraswati
Current Trends in Aquatic Science Vol 3 No 2 (2020)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Pantai samuh termasuk dalam Kelurahan Tanjung Benoa, Nusa Dua. Pantai Samuh banyak dimanfaatkan sebagai kegiatan pariwisata, jalur transportasi kapal dan pendaratan kapal yang menyebabkan terganggunya keseimbangan ekosistem perairan. Tujuan dari penelitian ini adalah untuk mengetahui struktur komunitas Echinodermata dan kondisi kualitas air di Pantai Samuh. Penelitian ini dilaksanakan pada bulan Februari-Maret 2018. Penelitian menggunakan metode deskriptif. lokasi penelitian ditentukan menggunakan metode purposive sampling. Terdapat 3 stasiun pegamatan yaitu stasiun 1 merupakan area nelayan (pendaratan kapal), stasiun 2 merupakan area pariwisata, dan stasiun 3 merupakan area tidak ada aktivitas. Berdasarkan hasil penelitian yang dilaksanakan pada 3 stasiun didapatkan 15 spesies Echinodermata yang tergolong ke dalam 4 kelas yaitu kelas Asteroidea, Ophiuroidea, Echinoidea, dan Crinoidea. Kelimpahan total Echinodermata pada masing-masing stasiun yaitu stasiun 1 dengan nilai 1,8 ind/m2, stasiun 2 dengan nilai 0,74 ind/m2, dan stasiun 3 dengan nilai 3,34 ind/m2. Indeks keanekaragaman ketiga stasiun masing-masing sebesar 2,3670, 1,8193, dan 2,4575. Indeks keseragaman ketiga stasiun masing-masing sebesar 0,9228, 0,8749, dan 0,9075. Sedangkan indeks dominansi ketiga stasiun masing-masing sebesar 0,1128, 0,2008, dan 0,1099. Berdasarkan kriteria indeks keanekaragaman Shanon-Wiener (H’), indeks keaekaragaman pada ketiga stasiun mengindikasikan tingkat keanekaragaman sedang yaitu penyebaran jumlah individu sedang. Nilai rata-rata hasil pengukuran parameter fisika dan kimia perairan di Pantai Samuh tergolong optimum untuk biota laut yaitu suhu 27,7-28oC, DO 5,1-5,2 mg/L, pH 7,8-8, Salinitas 29,7-29,9 ppt.

Kelimpahan dan Prevalensi Ektoparasit Ikan Kakatua (Famili Scaridae) di Pasar Ikan Kedonganan, Kabupaten Badung, Bali Handayani Sitorus; Pande Gde Sasmita Julyantoro; Dewa Ayu Angga Pebriani
Current Trends in Aquatic Science Vol 3 No 2 (2020)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Existence of parrotfish in Bali, especially at Kedonganan fish market, Badung Regency are already familiar for local society and visitors. However, the research about parrotfish specifically about parasites is still scarce. One factor that cause the decrease of fish quality is diseases caused by the presence of parasites in the fish body. This study aims to determine the various types of ectoparasite, abundance, prevalence, relationship between length or weight and number of parasites in the parrotfish (Family Scaridae). The sample of research were collected from Kedonganan fish market, Badung Regency, Bali from November until Desember 2019. The research was used a descriptive methods with purposive sampling technique. Ectoparasites found in the 35 gills of parrotfish were Gnathia sp. (492 ind), Hatschekia sp. (156 ind), and Haliotrema sp. (1.186 ind). The highest ectoparasite abundance is Haliotrema sp. (33.88 ind/fish) while the highest ectoparasite prevalence was Gnathia sp. (80.00%) and belong to a “usually” of infection level. The correlation between the length and number of parasites is in the “medium” level with the value of correlation (r) was 0,460 while the correlation between the weight and number of parasites was in the “medium” level with the value (r) was 0.502.

Jenis Makanan dan Area Makan Ikan Tongkol Abu-abu (Thunnus tonggol) yang didaratkan di PPI Kedonganan pada Musim Barat Putu Niken Ayu Saraswati; Pande Gde Sasmita Julyantoro; Gde Raka Angga Kartika
Current Trends in Aquatic Science Vol 3 No 2 (2020)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Kedonganan Fish Landing Port is part of Bali Strait which is one of longtail tuna habitat. There was no study about biological parameters on longtail tuna in Bali Strait especially in Kedonganan fish landing port. This study aims to determine fullness gastric contents of the longtail tuna landed at the Kedonganan Fish Landing Port and find out the composition and type of food contained in the stomach of the longtail tuna. This research was carried out for 5 months from October 2018 to January 2019. Analysis data used included percentage of 1 type of food, frequency of occurrence and index of gastric fullness. The results showed that the type of food found in the longtail tuna gut were small fish, squid and dissolved food. The frequency of occurrence of small fish has a percentage 80.5%, which means small fish is the main food of longtail tuna. The highest gastric fullness index was in November 2018 which showed that in November 2018 longtail tuna was actively looking for food. Longtail tuna is actively looking for food, but the eating activities decreased which is suspected at that time the availability of food decreased because of southwest monsoon. The food that contained in the longtail tuna gut were small fish, squid and dissolved food. Longtail tuna is a carnivorous fish because its main food was small fish and can be classified as stenophagic. Longtail tuna usually looking for food in the area around Uluwatu, Nusa Dua and Takacamung

Pengaruh Perbedaan Jenis Pakan Terhadap Pertumbuhan dan Kelangsungan Hidup Benih Ikan Lele Dumbo (Clarias gariepenus) Agus Wahyudi; Pande Gde Sasmita Julyantoro; I Wayan Darya Kartika
Current Trends in Aquatic Science Vol 3 No 2 (2020)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Feed is an important component in catfish farming activities. The feed cost can reach about 60-70% of the total production cost. This study aims to determine the effect of different types of feed on the growth and survival of African catfish (Clarias gariepinus) seeds. This research was conducted in June 2019 until July 2019 at Banyuwangi Kabat Fish Seed Center. This research was use experimental method by a Completely Randomized Design (CRD) consisting of three treatments and three replications, namely treatment A using silkworm feed (Tubifex sp.), Treatment B using frozen Daphnia sp., and C treatment using artificial crumble (PF-800) feed. The results showed that treatment A gave an absolute weight growth of 1,22 ± 0,14 grams, absolute length 4,41 ± 0,14 cm, SR value of 100 ± 0% and FCR 1,4, while treatment B gave an absolute weight of 0,94 ± 0,13 gram, absolute length 1,55 ± 0,22 cm, SR value of 100 ± 0%, FCR 1,8, and C treatment resulted in absolute weight of 0,97 ± 0,03 grams, absolute length of 2,83 ± 0,05 cm, SR value of 90 ± 10%, and FCR value of 1,6 The water quality parameters in each treatment namely temperatures ranged 26,50C-27,5°C, pH ranges 7,40-7,45, DO (Dissolved Oxygen) around 5,51-5,53 ppm, and ammonia values 0,78-2,72 ppm. Overall the measured water quality values are within the optimum range to support the growth of catfish seeds.

Kuantitas dan Kualitas Larva Ikan Nila (Oreochromis niloticus) Hasil Pemijahan Induk dengan Sex Ratio Berbeda Ade Angelia Atmanegara Sinaga; Pande Gde Sasmita Julyantoro; Ni Made Ernawati
Current Trends in Aquatic Science Vol 3 No 2 (2020)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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The prospect of developing freshwater fish farming development in Indonesia has been promising. One of the freshwater fish commodities that has a high economic value and market demand is tilapia (Oreochromis niloticus). This research aims to determine the optimal sex ratio for tilapia broodstock to produce the best quantity and quality of tilapia larvae. The research was conducted in December 2019 to February 2020 at Unit Pelaksana Teknis (UPT) Pasar Benih Ikan dan Balai Benih Ikan Denpasar. The method use is an experimental with complete random design with 3 treatments and 3 replicates. The sex ratio for this research was a ratio between males and females of 1:2, 1:3, 1:4. Observed parameters were fish larvae quantity, absolute weight and length tilapian larvae, survival rate tilapia larvae and water quality. The results of this research showed that sex ratio of tilapia has a significant effect (P < 0,05) on the quantity of tilapia larvae, with the highest quantity was obtained from the treatment B (sex ratio of 1:3) about 1305±393 individu, but the quality of the tilapia larvae e.g. absolute weight, length and survival rate were not significantly influenced by sex ratio of tilapia broodstock (P > 0,05). Water quality parameter including temperature, dissolved oxygen (DO) and potential of hydrogen (pH) were still at a range that supports tilapia life during the research period. Keywords: Tilapia; Larvae; Mating; Sex Ratio

Aspek Reproduksi Ikan Tongkol Abu-Abu (Thunnus tonggol) Yang Didaratkan Di Pelabuhan Pendaratan Ikan Kedonganan Hanif Abdullah; I Wayan Restu; Made Ayu Pratiwi; Gde Raka Angga Kartika
Current Trends in Aquatic Science Vol 3 No 2 (2020)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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Longtail tuna is one of the most important pelagic fish species found in Indo-Pacific waters, living in neritic areas. This study aimed to know about reproduction aspect of Longtail Tuna such as gonado somato index, fecundity and length of first maturity. This research was carried out for 5 months from October 2018 to January 2019. The research was conducted in Kedonganan fish landing port. Data analysis that used was the level of gonad maturity, gonad maturity index, fecundity, sex ratio and length of gonad maturity. Longtail tuna at Kedonganan fish landing port actively reproduce in October 2018. The highest value of maturity index of the gonad in October 2018 at Kedonganan fish landing port, shows that in that month is the peak of spawning season. This is in accordance with the number of fish caught more at the size of gonad maturity level III and IV in that month. Longtail tuna’s fecundity is around 18.000-24.000. Fish sex ratio of male and female is unbalanced. Differences in the number of Male and female is suspected because of differences in fish areas in spawning and foraging. The first length of maturity (Lm) of longtail tuna in the waters of the Kedonganan fish landing port were 488-496 mm fork length.

Struktur Komunitas dan Tingkah Laku Ikan Pada Karang Genus Acropora di Perairan Desa Bondalem, Provinsi Bali Fikri Huda Falah; I Wayan Arthana; Ni Made Ernawati
Current Trends in Aquatic Science Vol 3 No 2 (2020)
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Kelautan dan Perikanan, Universitas Udayana

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This study was conducted to determine the condition of reef fish communities and fish behavior at coral genus Acropora. Data retrieval was done in 3 observation points. The observations was done by stationary visual sensus method. The observations were made as 3 times during 3 months. The result of data collected on 3 observation points obtained 35 species. Diversity category in 3 locations tend to be moderated, the value was range of 2.20 to 2.75 related to the value of dominance indexs, was range of 0.07 to 0.14. The value of similarity indexs (E) was range of 0.89 to 0,99 indicated a stable reef fish community. Based on observations of the behavior of fish in the community at each fish station had solitary and schooling behavior. Fish swimming habits generally swim above, below, or beside the reef. But also observed several types of fish that have a habit of swimming in crevices of coral which was the fish family of Pomacentridae. As for feeding habits, fish which were observed had an eating activities swimming toward their food. The results of measurements of current speed range from 0.37 to 1.20 m/s, the visibility was reached to the bottom of the water, turbidity 1.30-1.40 NTU, temperature 29.33-29.67°C, Depth 4.2-13.7 m, and the range of salinity values were 30.00-31.67‰. This value was still in accordance with the standard quality of sea water for marine biota. This was in accordance with the quality standard value of Bali Governor Regulation No.16 Year 2016.

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Kota denpasar,

Bali

INDONESIA