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PERTUMBUHAN DAN LAJU PENANGKAPAN IKAN TONGKOL KOMO (EUTHYNNUS AFFINIS CANTOR 1849) YANG DIDARATKAN DI PELABUHAN PERIKANAN SAMUDERA BELAWAN SUMATERA UTARA GROWTH AND THE RATE OF CATCH OF EASTERN LITTLE TUNA (EUTHYNNUS AFFINIS CANTOR 1849) LANDED ON BELAWAN Putri, Febrina Rahmadanti; Bakti, Darma; Desrita, Desrita
AQUACOASTMARINE Vol 3, No 4 (2015): AQUACOASTMARINE
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Eastern Little Tuna is one of the fisheries commodity that has high economic value in Medan.This type of fish is the most demand in the local market, thus it becomes the main target forfisherman to catch. However, this activity has negative impact for the population of EasternLittle Tuna. This study was done at KUD Gabion on November 2014 until April 2015. Thisresearch aims to study about the growth pattern, factor condition of plumpness, and also therate of exploitation in order to determine management model for the fish resource. Theprimary data is the total length and weight of 371 samples of Eastern Little Tuna, while thesecondary data is the temperature of sea surface. The cohort length of fish is separated byBhattacarya method in FISAT II software. The Von Bertalanffy growth parameters estimatedwere asymtotic length (L?) = 628,95 mm, growth coefficient (K) = 0,24 year-1 and the age atzero length (t0) = -0,30 from Pauly?s empirical equation. Then, the growth equation forEastern Little Tuna is Lt = 628.95 (1?e[-0.24(t+0,30)]), whereas value of b obtained from relationsof lenght ? weight Eastern Little Tuna is 2,963. A growth pattern of Eastern Little Tuna isnegative allometric with an equation growth W=0,00002L2,963. The highest and the lowestvalue of factor condition are 0,40 and 2,11. The rate of total mortality (Z) Eastern Little Tunais 2,097 year-1 with natural mortality rate (M) 0,30 year-1 and fishing mortality rate (F) 1,79year-1 thus the rate of exploitation is obtained with the amount 0,85 and the value of thisexploitation rate has exceeded the value of the optimum exploitation, which is 0,5.Keywords: Eastern Little Tuna, Growth, Mortality, Malacca Strait
BIVALVIA DI PERAIRAN PANTAI CERMIN, KABUPATEN SERDANG BEDAGAI Hardianti, Nanda Mutia; Djayus, Yunasfi; Desrita, Desrita
AQUACOASTMARINE Vol 2, No 1 (2014): JURNAL AQUACOASTMARINE VOLUME 2, NO 1, AGUSTUS 2014
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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The Cermin Beach has a higher natural value such as biodiversity, one of them is bivalve. The objective this research is to study the community structure of bivalve and waters condition in Pantai Cermin of Serdang Bedagai Regency. This research was conducted since June - August 2013 using transec method at 3 station and 4 time interval of sampling. The observed physical and chemical parameter are temperature, salinity, pH, DO, TSS, and type of basic substrate.Bivalve are found in Cermin Beach of Serdang Bedagai Regency consists 15 species, i.e. The species with most value on each station is Donax cuneatus with the abudance in station I that is 150 ind/m2, the abudance in station II that is 331 ind/m2 and abudance in station III is 247 ind/m2. The species diversity index of bivalve range from 0,85 ? 1,22, uniformity index of bivalve range from 0,18 ? 0,30, domination index of bivalve range from 0,35 ? 0,57 and pollution index range from 1,23 ? 1,61 is lightly polluted.Keywords: Bivalvia,Cermin Beach, Community Structure
AKTIVITAS ANTIMIKROBA BIJI TERATAI (NYMPHAEA PUBESCENS L.) TERHADAP BAKTERI AEROMONAS HYDROPHILA, STREPTOCOCCUS AGALACTIAE DAN JAMUR SAPROLEGNIA SP. Widya, Dewi Roma; Suryanto, Dwi; Desrita, Desrita
AQUACOASTMARINE Vol 2, No 1 (2014): JURNAL AQUACOASTMARINE VOLUME 2, NO 1, AGUSTUS 2014
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Disease prevention in fish using chemicals or antibiotics leads to microbial resistance. One alternative to control the fish disease is to use plant extract. The aim of this study was to investigate the antimicrobial activity of lotus seeds (Nymphaea pubescens L.) on pathogenic bacteria and fungi in fish. The lotus seed was extracted with several solvent, such as n-hexsane, ethyl-acetate, and methanol. Antimicrobial activity assay was carried out using disc diffusion method. Phytochemical preliminary test was done to determine seed chemical compounds. The brine shrimp lethality test was utilised to determine the extract toxicity. The result showed that all extracts inhibited Aeromonas hydrophila, Streptococcus agalactiae, and Saprolegnia sp. growth to some extent. The extract was to inhibit more to S. agalactiae with inhibition zone of 10.72 mm. In general extract of n-heksana was to inhibit more to the test microbes. Cytotoxic activity (LC50) was <1000 ?g/ml. Preliminary test of phytochemical compound showed that extracts of lotus seed contains alkaloid, fenolic, glicoside, saponin and steroid/terpenoid.Keywords: Antimicrobial activity, microbial pathogenic, Nymphaea pubescens L.
STUDI ASPEK REPRODUKSI IKAN BAUNG (MYSTUS NEMURUS CUVIER VALENCIENNES) DI SUNGAI BINGAI KOTA BINJAI PROVINSI SUMATERA UTARA Manurung, Vindy Rilani; Djayus, Yunasfi; Desrita, Desrita
AQUACOASTMARINE Vol 1, No 1 (2013): JURNAL AQUACOASTMARINE VOLUME 1, NO 1, DESEMBER 2013
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Baung fish (Mystus nemurus CV) is a fish of high economic value. Thepurpose of research to reproductive aspects (sex ratio, gonad maturity level (TKG),gonad maturity index (IKG), first time size mature gonad, fecundity and eggdiameter). The study was conducted from March to May 2013 at three locations . Themethod used descriptive analytic .Sex ratio of Baung fish with unbalanced sex ratio with a value of 4.5>3.8.Gonad maturity level (TKG) found I- IV, while the male fish only I- III. gonadmaturity index (IKG) female fish 0.01-7.33% and 0.01-0.26% for male fish . The firstgonad size mature female fish is 268 mm . Fecundity of Baung fish is 18229-44 392eggs . Distribution diameter on the distribution of fish eggs female 0.38 to 2.05 mm.Keyword : Baung fish, Bingai river, Fish reproduction, Mystus nemurus CV.
LAJU DEKOMPOSISI SERASAH DAUN RHIZOPHORA APICULATA DAN ANALISIS UNSUR HARA C, N DAN P DI PANTAI SERAMBI DELI KECAMATAN PANTAI LABU KABUPATEN DELI SERDANG Murni, Fatimah; Djayus, Yunasfi; Desrita, Desrita
AQUACOASTMARINE Vol 3, No 2 (2015): JURNAL AQUACOASTMARINE VOLUME 3, NO 2, APRIL 2015
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Mangrove ecosystems have ecological functions, one of them is the contributor organic matter in aquatic through the production litter that being decomposed. This study aims to measure the rate leaf litter decomposition and nutrient content C, N and P. The research was conducted from July - October 2014 at the Serambi Deli Beach Pantai Labu distric, Sumatera Utara. The rate of leaf litter decomposition were used 21 bags litter bag at each station. Methods for determining the elements C is a Walkley and Black method, element N is a Kjehdahl method and element P is dry ashing method with HCL 25% extracting. The results measurements of litter decomposition rate was highest on day 15 and 30 was 1.01 g/day and the lowest at day 105 was 0.41 g/day. The value of the decomposition rate constant (k) leaf litter on the station I, II and III respectively amounted to 0.023, 0.024 and 0.025. Results highest nutrient is 28.75% for c analysis, and the lowest is 15.42%, the highest N element content is 0.92% and 0.28% low, the nutrient content highest P is 0.25% and the lowest is 0.17%.Keyword: Decomposition rate, mangrove, Rhizophora apiculata, element
STUDI KLOROFIL-A DI KAWASAN PERAIRAN BELAWAN SUMATERA UTARA STUDY OF CHLOROPHYLL-A AROUND SEA OF BELAWAN, NORTH SUMATERA Paramitha, Amanda; Utomo, Budi; Desrita, Desrita
AQUACOASTMARINE Vol 2, No 2 (2014): JURNAL AQUACOASTMARINE VOLUME 2, NO 2, DESEMBER 2014
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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There many activities around marine Belawan alters the marine water quality of Belawan. The information and understanding of environmental change are indispensable in ecosystem monitoring efforts. This research aims for knowing the study of chlorophyl-a, and the relationship between physical and chemical factors was done on Desember 2013 ? February 2014 in sea of Belawan, North Sumatera. The sampling was determined based on four location which is in various activities. There are 4 sampling in 3 months. The analysis of other factor, such as water temperature, pH, brightness, salinity, DO, nitrate, phosphate, and chlorophyll. The result of research showed there was a relation of physical chemical factors in sea of Belawan, North Sumatera. The range of the chlorophyll-a is 1,93 ? 5,96 mg/ m3. The highest concentration of chlorophyll-a was located in floating net cages in the range of 4,06 ? 5,96 mg/m3. The lowest concentration of chlorophyll-a was located in offshore in the range of 1,93 ? 2,53 mg/m3. The average value chlorophyll top are on the location 4 and the lowest in the location.Keywords : Chlorophyll-a, sea of Belawan
POTENSI, TINGKAT PEMANFAATAN DAN KEBERLANJUTAN IKAN TEMBANG (SARDINELLA SPP.) DI PERAIRAN SELAT MALAKA, KABUPATEN SERDANG BEDAGAI, SUMATERA UTARA Lubis, Rina Sari; Mulya, Miswar Budi; Desrita, Desrita
AQUACOASTMARINE Vol 1, No 1 (2013): JURNAL AQUACOASTMARINE VOLUME 1, NO 1, DESEMBER 2013
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Tembang fish (Sardinella spp.) is a small pelagic fish, which live inschooling. This fish can be caught using drift gill net gear, purse seine, handlinesand payang. The purpose of this study was to determine the potential ofsustainability with optimum fishing effort, utilization rates and insistence,sustainability and management of fish resources in Malacca Strait. The analysisof secondary data from 2008 to 2012 obtained from the Department of Marineand Fisheries Serdang Bedagai regency, and primary data obtained by performeda questionnaire related to the sustainability of tembang fish.The potential prediction performed with Fox model. The result shown thatMSY was 5.930,582 tons/year and optimum effort was 22.466 trips/year. Averageutilization rate of 44,95%, with an average rate of 77,26% insistence, whileallowable catch 4.744,465 tons/year. The sustainability of tembang fish,dimensional the ecological, technologies and institutions into unsustainablecategory. While economic and social dimensions included the category ofsustainable. The management efforts was by setting fishing season, the selectivityof fishing gear, prohibition of fishing gear and quota restrictions arrest.Keywords: Malacca Strait, Potential, Utilization, Sustainability, Sardinella spp.
IDENTIFIKASI BAKTERI POTENSIAL PATOGEN SEBAGAI INDIKATOR PENCEMARAN AIR DI MUARA SUNGAI DELI IDENTIFICATION OF POTENTIAL PATHOGEN BACTERIA AS INDICATOR OF POLLUTED WATER IN DELI RIVER ESTUARY. Meliala, Eunike Saron; Suryanto, Dwi; Desrita, Desrita
AQUACOASTMARINE Vol 3, No 2 (2015): JURNAL AQUACOASTMARINE VOLUME 3, NO 2, APRIL 2015
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Deli River has been used by people for a long time for washing clothes, utensils, bathing and as latrine. The human activity in the estuary of Deli River causes the river polluted with organic and inorganic pollutant and harm microorganism. The type of waste pollution in waters is related to the type and number of microorganism in the water. The urban and rural waste is not only increase the growth of coliform bacteria but also increase the number of other pathogen bacteria. Deli River Estuary has been polluted indicated by total bacteria count in the area is (811 x 105 cfu/ml). This exceeded threshold value determined by the Regulation of Minister of Living Environment (2004). There were 9 species of potential pathogen bacteria identified using API 20 E i.e: Escherichia coli, Klebsiella oxytoca, Klebsiella ornithinolytica, Cedecea lapegei, Aeromonas hydrophyla, Aeromonas sobria, Aeromonas caviae, Ewingella americana and Vibrio fluvialis.Keyword : Deli River, E.coli, Pathogen Bacteria.
KEANEKARAGAMAN IKAN DI SUNGAI BELUMAI KABUPATEN DELI SERDANG DIVERSITY OF FISH IN BELUMAI RIVER, DELI SERDANG DISTRICT Sagala, M Mahrozi; Patana, Pindi; Desrita, Desrita
AQUACOASTMARINE Vol 3, No 1 (2015): JURNAL AQUACOASTMARINE VOLUME 3, NO 1, PEBRUARI 2015
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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ABSTRACTThis research was conducted in Belumai River, Deli Serdang District in May-June 2014. The aim this research was to measure relative abundance, diversity, evennes and dominance of fish and the relationship with physical and chemical factors of water. The method used ?Purposive Random Sampling?. Fisihing gear used gill net, fishnet stocking and fish rod. Data were analyzed descriptive and multiple regression analysis. This research in 8 families, 12 genus, 14 species and 204 individual fishes. Diversity index was 1,18 ? 1,91, evennes index 0,73 ? 0,86 and dominance index 0,17 ? 0,37. Temperature was 28 ? 29,75oC, turbidity 3,25 ? 14,98 NTU, depth 0,78 ? 2,58, flow velocity 0,18 ? 0,77 m/sec, pH 5,9 ? 7,2 and DO 1,81 ? 5,02 mg/l. Regression results showed strong relationship among components. It?s seen from the range of the coefficient determination (R2) 0,866 ? 0,900.Keywords: River, Diversity, Fish, Belumai.
ASPEK BIOLOGI REPRODUKSI IKAN LEMEDUK (BARBODES SCHWANENFELDII) DI SUNGAI BELUMAI KABUPATEN DELI SERDANG PROVINSI SUMATERA UTARA Aisyah, Siti; Bakti, Darma; Desrita, Desrita
AQUACOASTMARINE Vol 3, No 1 (2015): JURNAL AQUACOASTMARINE VOLUME 3, NO 1, PEBRUARI 2015
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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The purpose of this research is to know the reproduction (the sex ratio, the gonad maturity level, the gonad maturity index, the size of the first mature gonad, fecundity, and the egg diameter). This research was done in May until June 2014 in four different locations by using census method. The sex ratio is consisting of 21 females fishes and 34 male fishes with a balanced sex ratio. The maturity gonad level for lemeduk female and male are found in I?IV. The gonad maturity index for female is 0,05% ? 9,66% and for male is 0,05% ? 9,75%. The size of the first mature gonad for male fish is 193 mm. The fecundity of female lemeduk is 5.345?54.372 eggs. The distribution of the female lemeduk egg diameter is 0,068?0,1202 mm.Keyword : Belumai River, Fish reproduction, Barbodes schwanenfeldii.,