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Acta Aquatica: Aquatic Sciences Journal
Published by Universitas Malikussaleh
ISSN : 24069825     EISSN : 26143178     DOI : -
Core Subject : Science, Education,
Materials Science & Nanotechnology Other
Acta Aquatica: Aquatic Sciences Journal is a scientific open access journal in the field of aquatic sciences, published periodically (April and October) by the Institute of Research and Community Service (LPPM) Universitas Malikussaleh (Malikussaleh University) in cooperation with Marine Center Universitas Malikussaleh, Department of Aquaculture Universitas Malikussaleh and Department of Marine Science Universitas Malikussaleh. Acta aquatica are publish original research, overviews and reviews relating to aquatic environments (wetlands, freshwater and marine waters) and the border limits of these environmental systems and the impacts of human activities on the environmental systems. Acta Aquatica has a related studies in aquatic bioecology, aquaculture, hydrology, biodiversity of aquatic biosphere, oceanology, exploitation and exploration technology of aquatic resources, fisheries product technology, aquatic microbiology, aquatic modeling, aquatic geographic information systems, and socio-economic of aquatic resources.
Arjuna Subject : -
Articles 341 Documents
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Karakteristik nutrisi dan stabilitas pakan kombinasi ampel (ampas tahu dan pelet) Rusydi, Rachmawati; Hartami, Prama; Khalil, Munawwar
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Aquatic Sciences Journal, Vol. 4: No. 1 (April, 2017)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v4i1.316

Abstract

Tingginya biaya produksi akibat dari mahalnya harga pakan berprotein tinggi menyebabkan eksplorasi bahan pakan alternatif yang bernutrisi, murah dan tersedia sepanjang tahun terus dilakukan. Penelusuran bahan alternatif ini juga diharapkan dapat meningkatkan kandungan protein dari pakan komersil berprotein rendah yang murah. Metode penelitian terdiri atas tahap pembuatan pakan uji, analisis proksimat, dan uji ketahanan pakan di air. Adapun perlakuan dalam penelitian ini adalah: (A) kombinasi ampas tahu 80% + pelet 20%, (B) kombinasi ampas tahu 60% + Pelet 40%, (C) kombinasi ampas tahu 40% + pelet 60%, (D) kombinasi ampas tahu 20% + pelet 80%, (E) kontrol (penggunaan pelet 100%). Hasil penelitian menunjukkan bahwa pakan ampel dengan kombinasi ampas tahu 40% + pelet 60% memiliki karakteristik nutrisi paling baik terutama protein sebesar 28,92%. Karakteristik fisik pakan terbaik melalui uji ketahanan pakan di air ditunjukkan oleh pakan pelet.Increment of aquaculture production cost caused by expensive feed containing high protein has made exploration of feed stuffs having high nutrition, low cost, and annually available continuously to be done. Investigation of alternative stuffs was expected to increase protein content of cheap commercial feed containing low protein. The methods of this research consisted of producing experimental feed, proximate analysis, and feed stability test in the water. The treatments were (A) combination of tofu waste 80% + feed 20%, (B) combination of tofu waste 60% + feed 40%, (C) combination of tofu waste 40% + feed 60%, (D) combination of tofu waste 20% + feed 80%, (E) control (feed 100%). This research resulted the best nutrition characteristic obtained from combination of tofu waste 40% + feed 60% in which its protein was 28,92%. The best physical characteristic through feed stability test in the water was obtained from commercial feed (control).
Tangkapan dan tingkat kematangan gonad Ikan selar kuning (Selariodes leptolepis) di Perairan Selat Malaka Tarigan, Adriana; Bakti, Darma; Desrita, Desrita
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Aquatic Sciences Journal, Vol. 4: No. 2 (October, 2017)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v4i2.300

Abstract

Biologi reproduksi meliputi distribusi frekuensi panjang, hubungan berat-panjang tubuh, rasio jenis kelamin, tingkat kematangan gonad (TKG), indeks somatic gonad (IKG), diameter telur. Data primer yang digunakan adalah panjang dan berat tubuh, bobot dan gonad Ikan yang diperoleh dari 360 ekor sampel. Data sekunder dikumpulkan dari Laporan Statistik Perikanan PPS Belawan berupa jumlah produksi, dan jumlah tangkapan ikan tahun 2011-2016. Hasil penelitian menunjukkan distribusi frekuensi panjang ikan berkisar antara 110 mm - 163 mm. pola pertumbuhan ikan adalah alometrik negatif dengan koefisien korelasi jantan dan betina mendekati 1 yaitu 0,812 dan 0,733. Indeks kematangan gonad untuk ikan betina adalah lebih besar dibanding ikan jantan. Tingkat kematangan gonad diperoleh dari tingkat I, II, III, dan IV.Reproductive biology including length frequency distribution, long weight relationship, sex ratio, gonadal maturity level, gonadal somatic index and egg diameters. Primary data used is lenght and body weight. Weighting obtained as many as 360 samples. Secondary data was collected from Fishing Statistical Report of PPS Belawan, which were the amount of production, and fishing effort of the year 2011-2016. The results showed the frequency distribution of fish length of 110 mm - 163 mm. Character growth negative allometric with a correlation coefficient males and females approximate to 1 whereas 0.812 and 0.733. Gonadal maturity index for females fish than large from males fish. Gonadal maturity index obtained by the I, II, III, and IV.
Efek surfaktan terhadap pertumbuhan, kelangsungan hidup dan struktur jaringan insang benih Ikan Nila (Oreochromis niloticus) Magfirah, Magfirah; Adhar, Saiful; Ezraneti, Riri
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Aquatic Sciences Journal, Vol. 2: No. 2 (October, 2015)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v2i2.340

Abstract

Penelitian ini bertujuan untuk mengetahui bagaimana pengaruh surfaktan terhadap pertumbuhan, kelangsungan hidup dan histologi insang benih ikan nila. Penelitian dilaksanakan pada bulan Oktober hingga November 2014 diLaboratorium Hatchery dan Teknologi Program Studi Budidaya Perairan Fakultas Pertanian Universitas Malikussaleh Aceh Utara. Ikan diberi perlakuan dengan konsentrasi deterjen yang berbeda, perlakuan yang diberikan yaitu: perlakuan A (Kontrol), B (deterjen 3 %), C (Konsentrasi deterjen 6 %) dan D (Konsentrasi deterjen 9 %). Pengambilan data dilakukan setiap 7 hari sekali. Adapun rancangan yang digunakan pada penelitian ini adalah Rancangan Acak Lengkap (RAL) dengan 4 perlakuan 3 ulangan dan dilanjutkan dengan Uji Beda Nyata Jujur jika terdapat perbedaan. Parameter yang diamati adalah parameter pada laju pertumbuhan, kelangsungan hidup, histologi insang dan efisiensi pakan serta parameter kualitas air (suhu dan pH). Hasil penelitian menunjukkan bahwa ikan nila yang diberi perlakuan konsentrasi deterjen 3 %, 6 %, 9 % berpengaruh terhadap pertumbuhan dan kelangsungan hidup. Perlakuan kontrol menghasilkan nilai, laju pertumbuhan dan efisiensi paling baik, yaitu masing-masing sebesar 2,84 gram, 97,36 %, sedangkan untuk kelangsungan hidup menunjukkan hasil yang terbaik pada perlakuan konsentrasi deterjen 3 % yaitu 100 %. Parameter kualitas air selama penelitian yang diukur antara lain adalah suhu air dengan kisaran 26,6-28,1 áµ’C, dan pH 7,1-7,8. This study aimed to know the effect of surfactant on growth, survival rate and gill histology of tilapia fingerling. It carried out on October to November 2014 at Hatchery and Aquaculture Technology Laboratory, Aquaculture Department Agriculture Faculty Malikussaleh University North Aceh. Experimented fish was given different concentrations of detergent. The treatments were A: control, B (detergent 3%), C (detergent 6%), and D (detergent 9%). Sampling data was done every seven days. Experimental design used was Completely Randomized Design with four treatments and three replications then it was continued by BNT test. Observed parameters were growth rate, survival rate, gill histology, feed efficiency, and water quality (temperature and pH). The result showed that different concentrations of detergent (3%, 6%, 9%) affected on growth and survival rate of tilapia fish. Control gave the best growth rate and feed efficiency which were 2,84 grams and 97,36%. While the highest survival rate was obtained in treatment of detergent 3% which was 100%. The water quality parameters during experiment were temperature ranged 26,6-28,1 áµ’C and pH ranged 7,1-7,8.
Efektivitas penambahan nano CaO cangkang kepiting bakau (Scylla serrata) kedalam pakan komersial terhadap pertumbuhan dan frekuensi molting udang galah (Macrobrachium rosenbergii) Zufadhillah, Saidi; Thaib, Azwar; Handayani, Lia
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Aquatic Sciences Journal, Vol. 5: No. 2 (October, 2018)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v5i2.811

Abstract

AbstrakPenelitian ini dimulai pada bulan Agustus 2017 sampai dengan November 2017. Rancangan percobaan yang digunakan adalah dengan 4 perlakuan dan 2 ulangan. Pada perlakuan A (pakan komersial tanpa penambahan nano CaO, perlakuan B (pakan komersial dengan penambahan 1% nano CaO), perlakuan C (pakan komersial dengan penambahan 2% nano CaO), perlakuan D (pakan komersial dengan penambahan 3% nano CaO). Hasil penelian menunjukkan bahwa frekuensi molting yang dihasilkan masing-masing perlakuan yaitu A 1,33 kali/ekor, B 1,67 kali/ekor, C 197 kali/ekor dan D 2,14 kali/ekor. Pertumbuhan bobot yang dihasilkan pada masing-masing perlakuan yaitu A 1,77 g, B 2,02 g, C 2,39 g, dan D 2,58 g. Pertumbuhan panjang yang dihasilkan pada masing-masing perlakuan yaitu A 1,63 cm, B 1,76 cm, C 2,11 cm, dan D 2,29 cm.Kata kunci: penggantian cangkang; nano kalsium; pertumbuhan; udang galahAbstractThis research began in August 2017 until November 2017. The experimental design used was 4 treatments and 2 replications. In treatment A (commercial feed without addition of nano CaO), treatment B (commercial feed with the addition of 1% nano CaO), treatment C (commercial feed with the addition of 2% nano CaO), treatment D (commercial feed with the addition of 3% nano CaO). the results showed that the frequency of molting produced by each treatment was 1.33 times / head, B 1.67 times / head, C 197 times / head, and D 2.14 times / head. the weight growth produced in each treatment was A 1.77 g, B 2.02 g, C 2.39 g, and D2.58 g. Long growth produced in each treatment is A 1.63 cm, B 1.76 cm, C 2.11 cm, and D 2.29 cm.Keywords: molting; nano calcium; growth; prawn
Pemberian probiotik pada pakan komersil dengan protein yang berbeda terhadap kinerja ikan lele (Clarias sp.) menggunakan sistem bioflok Salamah, Salamah; Zulpikar, Zulpikar
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Aquatic Sciences Journal, Vol. 7: No. 1 (April, 2020)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v7i1.2388

Abstract

Dalam usaha budidaya ikan, pakan merupakan salah satu faktor yang menentukan keberhasilan dalam budidaya. Selain itu pakan juga memberikan kontribusi yang besar terhadap biaya mencapai 60-70% dari biaya produksi. Berdasarkan hal tersebut perlu dilakukan teknik untuk meningkatkan kadar protein dari pakan, salah satunya dengan cara fermentasi. Selanjutnya limbah dari pakan juga merupakan suatu kendala dalam usaha budidaya. Untuk mengatasi permasalahan tersebut perlu dilakukan terobosan dalam sistem budidaya, salah satunya dengan menggunakan system bioflok dengan memanfaatkan bakteri heterotrofik. Selain memperbaiki kualitas air, bioflok juga menyediakan pakan secara insitu, sehingga mampu mengurangi biaya pakan dengan meningkatkan nilai efesiensi pakan. Penelitian ini bertujuan untuk menganalisis aplikasi pakan berprotein terfermentasi terhadap pertumbuhan dan konversi pakan ikan lele (Clarias sp.) menggunakan sistem bioflok. Penelitian ini dilaksanakan ditempat pembudidayaan lele di desa mesjid punteut dengan menggunakan metode Rancangan Acak Lengkap (RAL) dengan mengaplikasikan 3 perlakuan dan 3 kali ulangan sehingga diperoleh 9 satuan percobaan. Parameter yang diamati dalam penelitian ini meliputi laju pertumbuhan ikan, kelangsungan hidup dan efesiensi pakan. Hasil penelitian menunjukkan bahwa pemberian probiotik pada pakan memberikan hasil terbaik terhadap laju pertumbuhan ikan 4.95%, tingkat kelangsungan hidup 97.77% dan efesiensi pakan 98.86%.Kata kunci: bioflok; ikan lele; kinerja; probiotik In aquaculture, fish feed is one of the factors that determine success in aquaculture. Besides, the feed also contributes significantly to costs reaching 60-70% of production costs. Based on this, it is necessary to use techniques to increase the protein of the feed; one of them is by fermentation. In addition, waste from the feed is also a problem in the aquaculture business. To overcome these problems, it is necessary to make a breakthrough in the aquaculture system, one of these is using a biofloc system by utilizing heterotrophic bacteria. Besides improving water quality, biofloc also provides in situ feed, so it would reduce feed costs by increasing the value of feed efficiency. This study aims to analyze the application of fermented protein feed on growth and feed conversion of catfish (Clarias sp.) using the biofloc system. This research was carried out in the catfish culture at punteut mosque village using the Completely Randomized Design (CRD) method by applying three treatments and three replications to obtain nine experimental units. Parameters observed in this study include fish growth rate, survival and feed efficiency. The results showed that the administration of probiotics in feed gives the best results on fish growth rate of 4.95%, survival rate of 97.77% and feed efficiency of 98.86%.Keywords: biofloc; catfish; performance; probiotics
Contribution to the current list of Nitzschia species (Bacillariophyceae) in Malaysia Pau, Suriyanti Su Nyun; Nasir, Dzulhelmi Muhammad; Usup, Gires
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Jurnal Ilmu Perairan, Vol. 8: No. 2 (August, 2021)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v8i2.4777

Abstract

Current occurrence of Nitzschia Hassall from marine and freshwater environment in Malaysia is compiled from current and previously published materials. Phytoplankton was collected using a 20 µm plankton net from waterfronts of Peninsular Malaysia and Borneo. Some Nitzschia cells were successfully isolated and established into clonal cultures. For morphology observation, organic matters of the net samples and cultures were oxidized and removed through acid treatment. Cleaned specimens were observed using light and electron microscopes. The morphology of the Nitzschia cells was described and micrographs are included. In addition to current field sampling, Nitzschia spp. records and distributions in Malaysia had also been compiled from secondary data. Sources of references whereby the Nitzschia species were listed in this article were cited accordingly. This article compiles a total of 11 Nitzschia spp. found in Malaysia including a few revisions and new records. This article could serve as an important reference for Nitzschia taxonomic and distributional study particularly in tropical region.Keywords: distribution, morphology, taxonomy, tropical
Identifikasi dan sebaran ukuran Ikan Bunga Air (Clupeichthys goniognathus, Bleeker 1855) di inlet Waduk Koto Panjang Kabupaten Kampar Provinsi Riau Desrita, Desrita; Affandi, Ridwan; Kamal, Muhammad Mukhlis
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Aquatic Sciences Journal, Vol. 3: No. 1 (April, 2016)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v3i1.330

Abstract

Waduk Koto Panjang dibangun dengan membendung Sungai Batang Mahat dan Sungai Kampar Kanan. Waduk ini selesai dibangun pada tahun 1996 dan terdapat di Kabupaten Kampar Provinsi Riau. Banyak biodiversitas jenis nekton ditemui baik di perairan mengalir yang menjadi inlet maupun waduknya sendiri. Salah satu nekton yang ditemui di Perairan Inlet Waduk Koto Panjang adalah Ikan Bunga Air. Penelitian ini bertujuan untuk mengidentifikasi dan mengetaui sebaran ukuran Ikan Bunga Air. Pengambilan sampel ikan dilakukan selama empat bulan yaitu dari April - Juli 2010 dengan mengambil 5 lokasi penelitian. Stasiun I Muara Takus, Stasiun II Gunung Bungsu I, Stasiun III Gunung Bungsu II, Stasiun IV Tanjung I dan Stasiun V Tanjung II. Dari hasil penelitian didapatkan bahwa Ikan Bunga Air kedalam Kelas Actinopterygii Ordo Clupeiformes Famili Clupeidae Genus Clupeichtyhs dan Spesies Clupeichthys goniognathus Bleeker, 1855. Sedangkan distribusi ukuran yang dominan secara keseluruhan, ikan jantan dan betina adalah 30 - 47 mm dan 30 - 48 mm.Koto Panjang reservoir built with dam of Batang Mahat and Kampar Kanan river. This reservoir finishing built at 1996 and location in Kampar regency province Riau. Many biodiversity species of necton that finded in this aquatic, in river stream and in reservoir. One of necton that finded in Inlet Koto Panjang reservoir is Sumatran River Sprat. This research aims are for identified and to know distributed size of Bunga Air fish. Take the fish sample during 4 months, from April until July 2010 with five location research, namely Muara Takus, Gunung Bungsu I, Gunung Bungsu II, Tanjung I and the Tanjung II. The result research show Bunga Air fish include Class Actinopterigii Order Clupeiformes Family Clupeidae Genus Clupeichthys and Species Clupeichthys goniognathus Bleeker, 1855. While for the size distributed that dominant for all of it, male fish and female fish are 30 - 47 mm and 30 - 48 mm.
The efficacy of sodium chloride application in the control of fish lice (Argulus sp) infection on tilapia (Oreochromis niloticus) Dewi, Rita Rosmala; Siallagan, Wordianti; Suryanto, Dwi
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Aquatic Sciences Journal, Vol. 5: No. 1 (April, 2018)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v5i1.584

Abstract

The Argulus sp infection in freshwater fish including tilapia (Oreochromis niloticus) causes the serious problem in aquaculture. Despite the scarce of the preventive action in parasite infection, the application of salt mostly have been done in fish farming to overcome these parasites. The sodium chloride (NaCl) was used in farm because it was safe for water environment as well as it was inherent therein. The effectiveness of sodium chloride to control ectoparasites Argulus sp in tilapia juvenile was tested in laboratory. The fishes were infected by Argulus sp. and they are treated short term dip with three doses of sodium chloride namely 3 ppm, 6 ppm and 9 ppm for ten days. The  prevalence of parasites, the parasites intensity, and survival rate were examined and the results  were evaluated using statistic. The result showed that the NaCl salt application significantly affected the prevalence, the parasite intensity and the survival rate of fishes. The best dose that give the lowest prevalence, the lowest parasite intensity and the highest survival rate was the G3 (9 ppm dose).
Pengaruh salinitas terhadap perkembangan ektoparasit pada ikan nila (Oreochromis niloticus) selama penanganan karantina Herlina, Tina; Susanti, Novi; Andias, Kukuh; Barzakh, Imam
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Aquatic Sciences Journal, Vol. 6: No. 2 (October, 2019)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v6i2.1890

Abstract

AbstrakEksperimen untuk menyelidiki efek salinitas terhadap patogen nila (Oreochromis niloticus). Percobaan dilakukan di laboratorium Stasiun Karantina Ikan, Kualitas Pengendalian dan Keamanan Hasil Perikanan Bengkulu selama 30 hari. Eksperimen ini menggunakan desain acak dengan empat perlakuan dan empat replikasi. Perlakuan A: ikan di pelihara di 0 0/00, perlakuan B: ikan di pelihara di 2 0/00, perlakuan C: ikan di pelihara di 4 0/00 dan perlakuan D: ikan di pelihara di 6 0/00. Ikan disimpan di akuarium yang diisi air 75 liter dan setiap akuarium terdiri dari sepuluh ikan, dengan ukuran ikan berkisar 10- 12 cm. Pengamatan untuk parasit ikan dilakukan setiap lima hari. Data dianalisis dengan menggunakan analisis deskriptif. Selain itu, pengukuran kualitas air dan pengamatan hematologi dilakukan setiap 5 hari. Hasil analisis deskriptif menunjukkan bahwa salinitas berpengaruh signifikan terhadap prevalensi dan intensitas parasit yaitu pada salinitas 6 g / L. Selain itu, salinitas juga memberikan dampak negatif terhadap tingkat kelangsungan hidup nila (Oreochromis niloticus).Kata kunci: salinitas; parasit; prevelensi; intensitas; kelangsungan hidupAbstractAn experiment to investigates the effect of salinity on pathogens of tilapia (Oreochromis niloticus). The experiment was conducted at the laboratory of Stasiun Karantina Ikan, Pengendalian Mutu dan Keamanan Hasil Perikanan Bengkulu for 30 days. This experiment used randomized designs with four treatment and four replications. Treatment A: fishes kept in 0 0/00, Treatment B: fishes kept in 2 0/00, Treatment C: fishes kept in 4 0/00 and Treatment D: fishes kept in 6 0/00.  Fish were kept on aquarium filled with 75-litre water and each aquarium consisted of ten fishes, with the size of fishes ranged 10 - 12 cm. The observation for fish parasites was conducted every five days. The data were analyzed by using the descriptive analyzed. Besides, water quality measurement and hematology observation were taking every 5 days. The descriptive analyzed result showed that salinity gives significance effect to the prevalence and intensity of parasites which was at salinity 6 g/L. Other, salinity also gave negative impact to survival rate of tilapia (Oreochromis niloticus).Keywords: salinity; parasites; prevalence; intensity; survival rate
Analisis stok rajungan (Portunus pelagicus Linnaeus, 1758) di pantai utara Jepara, Provinsi Jawa Tengah Setiyowati, Desti; Sulistyawati, Dwi Retna
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Aquatic Sciences Journal, Vol. 6: No. 2 (October, 2019)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v6i2.1367

Abstract

AbstrakSumberdaya rajungan (Portunus pelagicus) di perairan Kabupaten Jepara menjadi salah satu komoditas yang banyak diminati oleh nelayan untuk ditangkap karena memiliki nilai jual yang tinggi, baik sebagai komoditas lokal maupun komoditas ekspor. Kebutuhan di pasar ekspor rajungan semakin meningkat sehingga menyebabkan kegiatan penangkapan rajungan ikut meningkat. Kenaikan upaya tangkap yang tidak terkendali dikhawatirkan menimbulkan penurunan produksi hasil tangkapan dan kondisi tangkap lebih pada stok rajungan. Potensi Kabupaten Jepara sebagai wilayah yang memberikan kontribusi pada penangkapan rajungan cukup tinggi untuk itu perlu adanya manajemen atas stok rajungan agar kontinuitas rajungan di pasar tetap terjaga dan stabil. Penelitian ini dilaksanakan pada bulan Januari hingga Desember 2017 disekitar pantai utara Jepara meliputi Desa Demaan, Kedung, dan Bondo Kabupaten Jepara. Tujuan penelitian ini adalah untuk mengkaji stok rajungan melalui analisis pola pertumbuhan, parameter pertumbuhan populasi, laju mortalitas, tingkat eksploitasi, dan pola rekrutmen rajungan di Pantai Utara Kabupaten Jepara. Pengambilan data dilakukan secara acak sederhana (simple random sampling). Pengambilan sampel menggunakan alat tangkap yang biasa di gunakan oleh nelayan rajungan di Jepara yaitu dengan menggunakan alat tangkap bubu lipat. Sampel yang terkumpul, dilakukan pengukuran parameter biologi rajungan yang meliputi ukuran lebar karapas. Hasil penelitian diperoleh bahwa ukuran lebar karapas rajungan yang paling banyak tertangkap di Pantai Utara Kabupaten Jepara adalah 136,70 mm. Secara umum pola pertumbuhan rajungan adalah allometrik negatif dengan persamaan pertumbuhan rajungan yang didapat adalah Lt = 172,09 [1- ]. Laju mortalitas alami (M) rajungan sebesar 0,91 per tahun dan laju mortalitas penangkapan (F) sebesar 3,25 per tahun, sehingga diketahui laju eksploitasi rajungan (E) sebesar 78% (overexploited). Pola rekruitmen rajungan di Pantai Utara Kabupaten Jepara tertinggi pada bulan Januari (15,02%)Kata kunci: Portunus pelagicus; stok; pertumbuhan; mortalitas; eksploitasi; rekruitmenAbstractBlue Swimming crab (Portunus pelagicus) resources in the waters of Jepara Regency are one of the commodities that are much in demand by fishers to be caught because they have a high selling value, both as a local commodity and an export commodity. The need for the crab export market is increasing so that it causes increased fishing activities. The increase in uncontrolled fishing efforts is feared to lead to a decrease in catch production and more catch conditions in the crab stock. The potential of Jepara Regency as a region that contributes to the capture of crabs is quite high, so that management of the crab stock is needed so that crab continuity in the market is maintained and stable. This research was conducted from January to December 2017 around the northern coast of Jepara including the villages of Demaan, Kedung, and Bondo, Jepara Regency. The purpose of this study is to study the crab stock through analysis of growth patterns, parameters of population growth, mortality rate, exploitation rate, and crab recruitment patterns on the North Coast of Jepara Regency. Data retrieval is done in simple random sampling. Sampling using fishing gear commonly used by crab fishermen in Jepara is by using a fishing trap. The collected samples were measured by the crab biological parameters which included the size of the carapace width. The results of the study showed that the width of the crab carapace most caught on the North Coast of Jepara Regency was 136.70 mm. In general, the crab growth pattern is negative allometric with the crab growth equation obtained is Lt = 172,09 [1- ].  The natural mortality rate (M) is 0.91 per year and the catch mortality rate (F) is 3.25 per year, so the crab exploitation rate (E) is known to be 78% (overexploited). The pattern of crab recruitment on the North Coast of Jepara Regency was highest in January (15.02%).Keywords: Portunus pelagicus; stock; growth; mortality; exploitation; recruitment

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