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JURNAL PERIKANAN DAN KELAUTAN TROPIS

JPKT
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Published by Universitas Sam Ratulangi

ISSN : 2302609X EISSN : 23026081 DOI : https://doi.org/10.35800/jpkt

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management

Jurnal Perikanan dan Kelautan Tropis merupakan terbitan berkala ilmiah yang bertujuan menjadi sarana penyebarluasan hasil penelitian dan ilmu pengetahuan dalam bidang Perikanan dan Kelautan di daerah Tropis. Hasil penelitian akan diutamakan untuk diterbitkan. Namun demikian, redaksi juga menerima ulasan ilmiah berupa tinjauan teori, ulasan buku baru, komunikasi singkat dan karya ilmiah lainnya. Artikel bisa ditulis dalam bahasa Indonesia atau Inggris.

Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ecology, Evolution, Behavior and Systematics

Articles 137 Documents

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INTRASPECIFIC VARIATION IN THE REPRODUCTIVE EFFORT AMONG THREE POPULATIONS OF AN INTERTIDAL GASTROPOD, Nerita japonica (Dunker) Paruntu, Carolus
JURNAL PERIKANAN DAN KELAUTAN TROPIS Vol 8, No 1 (2012)
Publisher : Sam Ratulangi University

The aim of the present research is to figure out the reproductive effort of Nerita japonica occurring in three different intertidal habitats of Amakusa Shimoshima Island, western Kyushu, Japan. Rocky shore population and other two stony shore populations (the upper stony shore and the lower stony shore) were described based on: (a) its mean mature gonad dry weight, (b) reproductive effort, and (c) the relationship between reproductive effort and body size. Data recorded in the period of spawning season. The results revealed that there were mean mature gonad dry weight and reproductive effort variations among three snail populations. Mean mature gonad dry weight and reproductive effort were larger for the Rocky shore population, intermediate for lower stone shore population, and smaller for the upper stone shore population. In one out of three populations, i.e., the upper stone shore population, reproductive effort of mature females increased significantly with an increase in body size. The data showed that reproductive effort is related to adult body size of N. japonica. There was an intraspecific variation in reproductive effort among three populations of N. japonica over even small geographic distances. Keywords: mature body size, mature gonad dry weight, reproductive effort, intraspecific variation, Nerita japonica. Â Variasi Indeks Kematangan Gonad Interspesies pada Tiga Populasi Gastropoda Intertidal, Nerita japonica (Dunder)) Penelitian ini bertujuan untuk mendeskripsikan indeks kematangan gonad dari gastropoda intertidal, Nerita japonica yang hidup di tiga habitat yang berbeda di Pulau Shimoshima Amakusa, Kyushu bagian barat, Jepang. Parameter yang diamati pada setiap populasi adalah: (a) nilai rata-rata berat kering gonad matang, (b) indeks kematangan gonad, dan (c) hubungan antara indeks kematangan gonad dan ukuran tubuh. Data dicatat pada periode musim pemijahan. Ketiga populasi memperlihatkan nilai rata-rata berat kering gonad yang matang dan indeks kematangan gonad yang berbeda. Populasi pantai berbatu memiliki nilai rata-rata berat kering matang gonad dan indeks kematangan gonad yang paling besar, diikuti oleh nilai dari populasi pantai berbatu bagian bawah dan populasi pantai berbatu bagian atas memiliki nilai yang paling kecil. Selanjutnya, satu dari tiga populasi, yaitu populasi pantai berbatu bagian atas memperlihatkan indeks kematangan gonad dari individu-individu betina N. japonica berhubungan dengan ukuran tubuhnya. Sekalipun indeks kematangan gonad dari individu-individu N. japonica meningkat secara signifikan dengan bertambahnya ukuran tubuh, namun terdapat variasi intraspesifik pada N. japonica dalam hal indeks kematangan gonad menurut habitat walaupun secara geografis berdekatan.Kata kunci: ukuran tubuh matang kelamin, berat kering gonad matang, indeks kematangan gonad, variasi intraspesifik, Nerita japonica.

HUBUNGAN UKURAN DAN KEMAMPUAN MUAT KAPAL PUKAT CINCIN KECIL PADA BEBERAPA DAERAH DI SULAWESI UTARA Pamikiran, Revols DCh
JURNAL PERIKANAN DAN KELAUTAN TROPIS Vol 9, No 1 (2013)
Publisher : Sam Ratulangi University

Kapal pukat cincin kecil merupakan kapal ikan yang umum digunakan untuk menangkap ikan pelagis kecil pada beberapa lokasi perairan di Sulawesi Utara. Penelitian ini bertujuan untuk mengetahui hubungan antara sesama dimensi ukuran utama dan antara dimensi ukuran utama dengan kemampuan muat pada 41 sampel kapal pukat cincin yang tersebar di beberapa lokasi di Sulawesi Utara. Hasil penelitian menunjukkan bahwa antara dimensi utama kapal pukat cincin memiliki model persamaan B=1,855+1,149L dengan r=0,74; D=-3,817+9,277L dengan r=0,70, dan hubungan antara panjang (L) dan kapasitas muat (GT) kapal pukat cincin menuruti model persamaan GT pukat cincin=2,154L0,043L dengan r=0,95. Kata kunci: muatan kotor, kapal pukat cincin, Sulawesi Utara. Â Small Purse-Seiner is a fishing vessel which is commonly used in catching small pelagic fish in several locations in North Sulawesi. The purpose of this study was to determine the relationship between the principle dimensions and between principle dimension with loading capacity (Gross Tonnage, GT). Â This research was conducted on 41 purse seiners from several locations in North Sulawesi. The results showed that relationship betÂween the principle dimensions followed the equation models B=1.855+1.149L, with r=0.74; D=-3.817+9.277L, with r=0.70, and the relationship between the length (L) and load capacity (GT) purse seiner is fitted by the following mathematical model: GT purse seiner=2.154L0.043L with r=0.95. Keywords: gross tonnage, small purse-seiner, North Sulawesi.

KANDUNGAN VITAMIN C PADA OVARIUM IKAN LELE (Clarias gariepinus) SAAT SIKLUS REPRODUKSI Sinjal, Hengky J
JURNAL PERIKANAN DAN KELAUTAN TROPIS Vol 6, No 3 (2010)
Publisher : Sam Ratulangi University

Vitamin C content in the ovarium of African Catfish (Clarias gariepinus) during reproductive cycle was investigated. One hundred twenty samples of females covering different stages of reproductive cycle were collected from fresh water ponds. The fishes were sacrifized and the ovarium were collected for analysis of gonad maturation stage (TKG), oocyt structure and vitamin C content in the ovarium. Â Results indicated that average of vitamin C content of ovarium at stage I was 74.33mg/g (wet weight). The maximum content was found in stage III at level of 155.98mg/g (wet weight) and afterwards in the next stage vitamin C content decreased. The maximum of oocyt stadium 3 (oocyt vitelogenesis) was also found at this stage III. The findings indicate that vitamin C has a role in the reproductive cycle of catfish and its content is related to ovarium development and oogenesis.

DAMPAK PERIKANAN TANGKAP TERHADAP SUMBERDAYA IKAN DAN HABITATNYA DI PERAIRAN PANTAI TABUKAN TENGAH KEPULAUAN SANGIHE Tamarol, Joneidi; Luasunaung, Alfret; Budiman, Johnny
JURNAL PERIKANAN DAN KELAUTAN TROPIS Vol 8, No 1 (2012)
Publisher : Sam Ratulangi University

Overfishing and environmental degradation from fishing activities result in changes in aquatic ecosystems, and almost all fishing gears could cause habitat damages. This study attempted to evaluate the impact of different fishing gears utilized by traditional fishermen on the fish resources and their habitats and formulate an environmenttal friendly fishing fisheries concept. Data collection used two approaches, through a long-term catch analysis and a direct field observation on the fishing process. Results found that several fishing gears used were potential to cause damages on bottom habitats due to the operational technique and the treatment to the gear itself. Beside that, some gears were also potential to unbalance the stability and the the sustainability of the fish resources due to the utilization of excessively small-sized mesh. Based on the internal factor analysis strategy (IFAS) and the external factor analysis strategy (EFAS), the use of fish traps, circling gill nets, and turtle targeting hand lines in the coral reef area weÂre potential to cause direct negative impact on the coral reefs and the sustainability of the fish resources.Keywords: impact, habitat damage, resources damage, over fishing, selectivity. Â Kelebihan tangkap dan degradasi lingkungan dari kegiatan perikanan mengakibatkan perubahan ekosistem perairan dan hampir semua alat tangkap ikan dapat menyebabkan kerusakan habitat. Penelitian ini bertujuan mengevaluasi dampak alat tangkap yang digunakan oleh nelayan di perairan pantai Tabukan Tengah, Kabupaten Kepulauan Sangihe terhadap sumberdaya dan lingkungan dan merumuskan konsep kebijakan pengembangan perikanan tangkap yang ramah lingkungan. Pengumpulan data dilakukan menggunakan dua pendekatan yakni menganalisis hasil tangkapan untuk jangka waktu yang panjang dan pengamatan langsung terhadap proses penangkapan ikan. Hasil menunjukkan bahwa beberapa alat tangkap yang digunakan berpotensi merusak habitat dasar perairan karena tehnik pengoperasiannya dan perlakuan terhadap alat tangkap tersebut. Di samping itu, beberapa jenis alat tangkap berpotensi merobah stabilitas dan keberlangsungan sumberdaya ikan karena penggunaan mata jaring berukuran sangat kecil. Berdasarkan strategi analisis faktor internal dan strategi analisis faktor eksternal, maka penggunaan bubu ikan, jaring insang lingkar, jala lempar dan ladung penyu di daerah terumbu karang memiliki dampak negatif bagi terumbu karang dan keberlanjutan sumberdaya ikan. Kata kunci: dampak, kerusakan habitat, kerusakan sumberdaya, tangkap lebih, selektivitas.

NIRA LONTAR SEBAGAI KANDIDAT DALAM MEMPERTAHANKAN KANDUNGAN PROTEIN SILASE JEROAN IKAN CAKALANG Hege, Yandres Nelson; Suwetja, I Ketut; Ijong, Frans G
JURNAL PERIKANAN DAN KELAUTAN TROPIS Vol 8, No 3 (2012)
Publisher : Sam Ratulangi University

Jeroan ikan sebagai limbah dari pengelolaan ikan cakalang panggang di Kupang, Nusa Tenggara Timur dapat dimanfaatkan untuk membuat silase dengan menambahkan bahan nira lontar (Borassus flabellifer) yang telah mengalami fermentasi. Fermentasi dilakukan selama 0â€“15 hari dan pengujian terhadap total asam, pH, serta kadar protein kasar dilakukan secara teratur. Hasil yang diperoleh menunjukkan bahwa penambahan nira lontar yang telah difermentasi ke dalam jeroan ikan cakalang pada semua konsentrasi secara nyata memberiÂkan pengaruh terhadap pertumbuhan bakteri asam laktat dan menekan pertumbuhan bakteri pembusuk, hal ini erat kaitannya dengan kandungan asam (total asam) nira lontar yang berkontribusi terhadap penurunan pH bahan fermentasi. Produk silase jeroan ikan cakalang terbaik, ditinjau dari aspek kadar protein kasar, adalah pada perlakuan konsentrasi nira lontar 10% dengan lama fermentasi 24 jam yang memiliki kandungan protein sebesar 15,46% dari berat basah bahan fermentasi (silase). Kata kunci: Silase, jeroan ikan cakalang, nira lontar, fermentasi Â The innards from fresh tuna fish grill in Kupang, Nusa Tenggara Timur can be used to make silage with addition of fermented sap of lontar palm (Borassus flabellifer). Fermentation was carried out for 0â€“15 days and regularly tested for total acid, pH, as well as the crude protein content. The results showed that the addition of palm sap that has been fermented into the innards of tuna at all concentrations significantly impact the growth of lactic acid bacteria and suppress the growth of spoilage bacteria, it is closely related to the acid content (total acid) that contribute to the palm sap decrease in pH of fermentation ingredients. Tuna offal silage products best viewed from the aspect of the content of crude protein in the treatment of palm sap concentration of 10% with a 24-hour fermentation time which has a protein content of 15.46% by weight of the wet ingredients fermentation (silage). Keywords: Silage, tuna offal, lontar palm sap, fermentation

Morphometric study of seagrass Thalassia hemprichii in the coastal area of the Bahoi Village, West Likupang Sub-distritct, North Minahasa District Yuneke Kansil; Khristin I.F. Kondoy; Joudy R.R. Sangari; Alex D. Kambey; Adnan S. Wantasen; Hermanto Manengkey
JURNAL PERIKANAN DAN KELAUTAN TROPIS Vol. 10 No. 3 (2021)
Publisher : Sam Ratulangi University

The purposes of the morphometrics of seagrass Thalassia hemprichii study (based on samples taken from the coast of Bahoi Village, Likupang Barat Sub-district, North MInahasa District) were as follow: (1) to know the environmental conditions (temperature, salinity, pH, substrate) on the coastal area of Bahoi Village, (2) to describe the morphometrics of seagrass T. hemprichii,Â and (3) to compare the morphometric of seagrass Thalassia hemprichii based on sampling stations. Data were collected using a survey method, to sample the seagrass T. hemprichii in three locations. As many as 30 individuals at each study location, were then measured using a digital caliper. The results of the measurement analyzed statistically show that the value was not significantly different. There is no significant difference in the size of the seagrass growth due to environmental conditions or environmental parameters that exist at these 3 stations and supposedly are still within the safe limits for seagrass growth. This evidence was gained based on the results of the ANOVA test (one way ANOVA) which was not significantly different.Keyword : Morphometrics; Thalassia hemprichii; Seagrass; Bahoi Village; CoastÂ ABSTRAKTujuan Penelitian ini adalah mengetahui morfometrik Lamun Thalassia hemprichii berdasarkan sampel yang diambil di Pesisir Pantai Desa Bahoi Kecamatan Likupang Barat. yaitu : (1) Mengetahui kondisi lingkungan perairan lamun (suhu, salinitas, pH, substrat) di Pesisir Pantai Desa Bahoi, (2) Mendeskripsikan morfometrik dari lamun Thalassia hemprichii, (3) Membandingkan morfometrik lamun Thalassia hemprichii berdasarkan stasiun pengambilan sampel. Pengambilan data dilakukan dengan menggunakaan metode survei jelajah, dengan menggunakan Global Positioning System (GPS) dan dilanjutkan dengan pengambilan sampel Lamun Thalassia hemprichii sebanyak 30 individu pada setiap lokasi penelitian,Â Â kemudianÂ diukur dengan menggunakan caliper digital. Hasil yang analisis diperoleh berdasarkan nilai statistik Thalassia hemprichii di Pesisr Pantai Desa Bahoi adalah tidak berbeda nyata. Tidak adanya perbedaan yang nyata dari ukuran pertumbuhanÂ lamun tersebutÂ disebabkan oleh kondisi lingkungan atau parameter lingkungan yang adaÂ pada ke 3 stasiun ini masih dalam batas yang aman bagi pertumbuhan Lamun. Dibuktikan dengan Hasil uji ANOVA satu jalur (one way ANOVA) diperoleh tidak berbeda nyata.Kata kunci : Morfometrik; Thalassia hemprichii; Lamun; Desa Bahoi; Pesisir

KOMUNITAS VEGETASI HUTAN MANGROVE DI DESA WORI KABUPATEN MINAHASA Rangan, Jety K
JURNAL PERIKANAN DAN KELAUTAN TROPIS Vol 6, No 1 (2010)
Publisher : Sam Ratulangi University

Hutan mangrove merupakan ekosistem khas pesisir yang dipengaruhi oleh pasang surut. Vegetasi mangrove ini merupakan salah satu potensi sumberdaya alam yang produktif. Penggunaan areal mangrove untuk berbagai kepentingan seperti lahan pertanian, pertambakan udang dan ikan, pengusahaan hutan dan pemukiman terjadi hampir di seluruh Indonesia, seringkali pemanfaatannya tidak terkontrol dan peranan hutan mangrove dalam rangkaian system ekologisnya diabaikan. Adapun tujuan penelitian ini untuk menggambarkan komunitas hutan mangrove dengan melihat komposisi spesies, kerapatan, dan keanekaragaman spesies. Dalam pengambilan sampel menggunakan metode transek . Dari kegiatan penelitian ini diperoleh empat spesies mangrove yang tersebar di tiga stasiun pengamatan masing-masing Avicennia marina, Bruguiera gymnorrhyza, Rhizophora stylosa dan Sonneratia alba.

RATIO PENGENCERAN SPERMA TERHADAP MOTILITAS SPERMATOZOA, FERTILITAS DAN DAYA TETAS IKAN LELE (Clarias sp.) Adipu, Yulianty; Sinjal, Hengky J; Watung, Juliaan
JURNAL PERIKANAN DAN KELAUTAN TROPIS Vol 7, No 1 (2011)
Publisher : Sam Ratulangi University

This study was aimed to determine the effect of the dilution ratio of sperm with optimal NaCl and fructose on the motility of the catfish, Clarias sp., spermatozoa, fertility and hatchability of eggs. Catfish used in this study consisted of one parent pairs (male and female weight of 1000 grams weight of 1500 g). NaCl and fructose solution were diluted with aquabidest. The observation was conducted on the motility of spermatozoa, fertility and hatchability of eggs. The experimental design used completely randomized design (CRD). Dilution ratio is 1: 0, 1, 20, 1: 40, 1; 60, 1: 80, and 1: 100 with replicated 3 times. Observations were carried out soon after the sperm mixed with diluents. Fertility occurred 12 hours after fertilization. Egg hatchability was observed after fertilization. The results showed that the ratio of dilution gave significant effect on the sperm motility, fertility and hatchability of the eggs. This research found that the dilution ratio 1: 60 was the best treatment with the average sperm motility of 96. 66%, fertility of 71, 66 5% and egg hatchability of 70%.

Gastropods In Seagrass Beds Of Tongkeina Beach Waters, Manado North Sulawesi Alvira Y. Bulahari; Alex D. Kambey; Anneke V. Lohoo
JURNAL PERIKANAN DAN KELAUTAN TROPIS Vol. 10 No. 2 (2021)
Publisher : Sam Ratulangi University

The Tongkeina coastal waters have relatively extensive tidal areas. In addition to the seagrass community, there are also distinctive coastal communities such as mangroves and coral reefs. Coastal resources in this region are often used by the local community as a food source and have been used as a place of recreation and hotels as well. This is the reason for this study to find out the existence of gastropods on the seagrass beds in the Tongkeina area. It is expected that this study will provide information on the development and existence of the gastropods in coping with the pressure due to the construction of the hotel several years before. The methods of analysis used in this study including identification of gastropods, density, dominance, and diversity. The same research has been conducted several years before, and therefore this information was used as a comparison of the development of gastropods in the area. Thirty-five species (23 genera) were identified, with the highest density recorded was Nassarius gruneri, 0.8667 Individual/mÂ², the dominance of 0.13972, and diversity (H'= 2.6853) which is greater than the results of the previous study 5 years ago (Hâ€™=1,9382). These results indicate that these waters are in the process of improving from previous environmental conditions.Keywords : Gastropod, coastal, domination, diversity, Tongkeina.Â ABSTRAKPerairan pesisir Tongkeina memiliki wilayah pasang surut relatif luas. Selain komunitas Lamun,Â Â jugaÂ terdapat komunitas khas wilayah pesisir lainnya seperti Mangrove dan Terumbu karang. Sumber daya pesisir di wilayah iniÂ sering digunakanÂ untuk kebutuhan makanan masyarakat, di samping itu telah dimanfaatkan sebagai tempat rekreasi danÂ Hotel. Hal ini menjadi alasan untuk mengetahui keberadaan Gastropoda di hamparan Lamun di daerah Tongkeina.Â Diharapkan dapat memberikan informasi perkembangan keberadaan Gastropoda, setelah melewati tekanan akibat dibangunnya hotel sejak beberapa tahun sebelumnya. Metoda analisis yaitu jenis-jenis Gastropoda, kepadatan, dominasi, dan keanekaragaman. Hal yang sama juga telah dilakukan beberapa tahun sebelumnya, sehingga informasi ini dapat dijadikan pembanding perkembangan Gastropoda di daerah tersebut. Diperoleh 35 spesies (23 genera), kepadatan tertinggi adalah Nassarius gruneri, 0.8667 Ind/mÂ², dominasi sebesar 0.13972, dan keanekaragamannya (Hâ€™= 2.6853) lebih besar dari hasil penelitianÂ 5 tahun sebelumnya yaitu . 1,9382. Hasil ini menunjukkan bahwa perairan tersebut berada dalam proses perbaikan kondisi lingkungannya.Kata Kunci : Gastropoda, pesisir, dominasi, keanekaragaman, Tongkeina.

TRANSFER IPTEK KELOMPOK MASYARAKAT HILIR (DOWNSTREAM) DI KELURAHAN KOMO LUAR MANADO Pelle, Wilmy E; Wantasen, Adnan Sj
JURNAL PERIKANAN DAN KELAUTAN TROPIS Vol 6, No 2 (2010)
Publisher : Sam Ratulangi University

The district of Komo Luar is one of the downstream areas of River Tondano. Based on some researches, performance of physic-chemical parameters show under of Indonesian Water Quality Guidelines e.g. dissolved oxygen, nitrate, phosphate, and e. colii. Knowledge and Technology Transferring has chosen in order to implement the soft approaches. Some programme has been done for example, training related to water quality and awareness campaign. We expected this programme could be modify the way of thinking of people around the river.

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Alex Denny Kambey

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+6282196305145

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Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi Manado Indonesia 95115

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Sulawesi utara

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