scholarly journals DISTRIBUSI UKURAN PANJANG DAN PARAMETER POPULASI LOBSTER LUMPUR (Panulirus polyphagus Herbst, 1793) DI PERAIRAN SEBATIK, KALIMANTAN UTARA (WPPNRI-716)

2018 ◽  
Vol 1 (1) ◽  
pp. 11
Author(s):  
Umi Chodrijah ◽  
Asep Priatna ◽  
Duto Nugroho
Keyword(s):  
Spiny Lobster ◽  
Total Mortality ◽  
Management Plan ◽  
Population Parameter ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Stock Status ◽  
Annual Total ◽  
Biological Aspects ◽  
Average Size

Sumberdaya udang barong lumpur (Panulirus polyphagus Herbst, 1793) atau dalam bahasa lokal dikenal sebagai lobster Pakistan telah dimanfaatkan sebagai salah satu komoditas yang bernilai ekonomis di perairan pulau Sebatik, Kalimantan Utara. Data statistik perikanan menunjukkan produksi udang barong di perairan Timur Kalimantan tahun 2005 – 2015 meningkat pesat dengan kelipatan 10 kalinya. Terkait dengan fenomena tersebut, penelitian tentang aspek biologi populasi telah dilakukan pada bulan Maret sampai dengan November 2016. Penelitian ini bertujuan untuk mendapatkan parameter populasi sebagai landasan untuk mengetahui status stok pada tingkat pemanfaatan terkini. Hasil penelitian menunjukkan udang betina tertangkap pada ukuran rata-rata 86,9+ 8,58 mmCL sedangkan udang jantan pada ukuran 81,5 + 9,63 mmCL. Pola pertumbuhan udang jantan dan betina bersifat allometrik negatif (b<3). Estimasi panjang asimtotis (CL) sebesar 124,1 mm dengan laju pertumbuhan (K) 0,598/tahun. Rata-rata ukuran pertama tertangkap (CLc) adalah 84,5 mmCL. Nilai tersebut lebih rendah dari pertama kali matang gonad (CLm) sebesar 90,74 mmCL. Laju kematian total (Z) sebesar 2,26/tahun, laju kematian alamiah (M) 0,87/tahun serta laju kematian akibat penangkapan (F) 1,39/tahun. Estimasi laju eksploitasi cenderung mengarah kepada penangkapan berlebih (E = 0,61), oleh karena itu perlu dilakukan tindakan pengelolaan melalui pendekatan pengendalian upaya penangkapan dan pembatasan ukuran minimum yang boleh ditangkap. Mud spiny lobster (Panulirus polyphagus Herbst, 1793) or locally known as Pakistan lobster has been exploited as an important economic species in the waters of Sebatik Island, North Kalimantan. The best available capture fisheries statisticon 2005-2015 indicates the production of marine lobster were significantly increased by 10. Based on this phenomenon, observations on biological aspects were carried out during period of March to November 2016. The aim of this study were to estimate of stock status under existing fisheries condition. The result showed that the average size of females was 86.9+ 8.58 cmCL and males was 81.5 + 9.63 mmCL. The growth pattern indicates allometric negative (b<3). Population parameter performed by length based analysis indicates that asymptotic length (CL) was 124.1 mmCL with growth rate (K) of 0.598/yr.The average size of first capture (Lc) was estimated at 84.5 mmCL. This value was less than average size of first mature (CLm) of 90.7 cmCL.The predicted annual total mortality rates (Z) was 2.26/yr, the natural mortality (M) was 0.87/yr, and fishing mortalities (F) was 1.39/yr. The exploitation rates (E) of 0.61 tend to be beyond the sustainable exploitation level. To reduce the fishing mortality, the initiative of specific local management plan on restructuring active fleet and establishing minimum legal size should be implemented. 

scholarly journals Stock assessment of the Indian mackerel Rastrelliger kanagurta (Cuvier, 1817) from Muscat coast, Oman

2016 ◽  
Vol 63 (4) ◽  
Author(s):  
N. Jayabalan ◽  
S. Zaki ◽  
A. Al-Marzouqi ◽  
F. Al-Kiyumi
Keyword(s):  
Stock Assessment ◽  
Total Mortality ◽  
B Value ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Indian Mackerel ◽  
A Value ◽  
Annual Total ◽  
Rastrelliger Kanagurta ◽  
Relationship Of

Assessment of age, growth and stock parameters was carried out for the Indian mackerel Rastrelliger kanagurta (Cuvier) along the Muscat coast of Oman between October 2007 and September 2009. The length-weight relationship of the fish indicated the ‘a’ value as 0.0101 and ‘b’ value as 3.0589. The length based von Bertalanffy growth (VBG) parameters L∞ K and t0 estimated were 37.54 cm, 1.0 y-1 and -0.17 y respectively. The estimates of mortality rates showed the annual total mortality (Z) to be 2.98, the natural mortality (M) 1.62 and fishing mortality (F) 1.36. The MSY estimated by Cadima’s estimator was 859 t and the predicted value by yield analysis stood at 1,273 t. The calculated exploitation rate (E) was 0.46. The Yw/R at F = 1.6 was 48 g. Estimates of higher MSY than the current yield, lower fishing mortality than natural mortality and lower E indicate scope for increase in yield of R. kanagurta from Muscat region.

scholarly journals POPULATION DYNAMICS OF MALAYAN LEAF FISH (Pristolepisgrooti Blkr.) IN RANAU LAKE, SOUTH SUMATRA

2018 ◽  
Vol 24 (2) ◽  
pp. 125
Author(s):  
Sevi Sawetri ◽  
Subagdja Subagdja ◽  
Dina Muthmainnah
Keyword(s):  
Mortality Rate ◽  
Growth Parameters ◽  
Total Mortality ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Frequency Data ◽  
Length Frequency ◽  
Lake Ecosystems ◽  
Exploitation Rate ◽  
Length Frequency Data

The Malayan leaf fish or locally named as kepor (Pristolepis grooti) is one of important biotic components in Ranau Lake ecosystems. This study aimed to estimate population dynamic and exploitation rate of kepor in Ranau Lake, South Sumatera. The population parameters are estimated based on length frequency data which were collected in March to October 2013. Growth parameters and fishing mortality rates were calculated using FiSAT software package. The results showed that kepor’s growth was negative allometric, which tended to gain length faster than weight. Kepor population was dominated (42%) by individual length of 10.0 to 11.0 cm. Predicted length infinity (L) was 17.28 cm with high value of growth rates (K) of 1.4 year-1. The natural mortality rate (M) is 2.57 year-1, the fishing mortality rate (F) is 5.36 year-1 and total mortality rate (Z) is 7.93 year-1. The exploitation rate of Malayan leaf fish in Ranau Lake (E = 0.68 year-1) has passed the optimum score.  

Annual total mortality and population stucture of jackass morwong (Nemadactylus macropterus Bloch & Schneider) in eastren Australian waters

1983 ◽  
Vol 34 (2) ◽  
pp. 253 ◽  
Author(s):  
DC Smith
Keyword(s):  
New South ◽  
New South Wales ◽  
Total Mortality ◽  
Natural Mortality ◽  
Trawl Fishery ◽  
South Wales ◽  
Annual Total ◽  
Older Males

Catch curves were analysed to estimate the annual total mortality of jackass morwong landed at the port of Eden between July 1976 and June 1979. The annual total mortality of females was lower in 1978-1979 than in the previous 2 years, reflecting the expansion of the trawl fishery in New South Wales to include previously unexploited deepwater grounds. Males were fully recruited to the commercially exploited population at an earlier age than females. It is suggested that the increased mortality in older males is due to an increase in natural mortality.

scholarly journals PARAMETER POPULASI DAN BIOLOGI REPRODUKSI IKAN BENTONG (Selar crumenophthalmus) DI PERAIRAN KWANDANG,GORONTALO UTARA

2015 ◽  
Vol 6 (2) ◽  
pp. 111 ◽  
Author(s):  
Ria Faizah ◽  
Lilis Sadiyah ◽  
Tuti Hariati
Keyword(s):  
Total Mortality ◽  
Maturity Stage ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Frequency Data ◽  
Population Parameters ◽  
Length Frequency ◽  
Exploitation Rate ◽  
Length Frequency Data ◽  
Pelagic Fisheries

Perairan Kwandang merupakan salah satu basis utama perikanan pelagis kecil di perairan laut Sulawesi. Salah satu jenis yang banyak dimanfaatkan adalah ikan bentong (Selar crumenophthalmus). Penelitian ini bertujuan untukmenduga parameter populasi, tingkat pemanfaatan (E), dan biologi reproduksi dari ikan bentong. Data panjang cagak dikumpulkan dari PP Kwandang dari bulan Januari hingga November 2012. Pendugaan parameter populasi dilakukan dengan menggunakan metode Bhattacharya dengan bantuan software FISAT II Hasil analisis menunjukkan bahwa laju pertumbuhan (K) sebesar 0,76 per tahun dengan L”=24,7 cm. Laju kematian total (Z) sebesar 2,63 per tahun, dengan laju kematian alamiah (M) sebesar 1,28 per tahun, laju kematian akibat penangkapan (F) sebesar 1,3 per tahun dan laju pemanfaatan 0,51. Tingkat pemanfaatan ikan bentong sudah relatif optimum. Rasio jenis kelamin ikan bentong jantan dan betina adalah 1: 1,02. TKGI paling banyak ditemukan. Musim pemijahan ikan bentong diduga terjadi pada bulan November dan Desember.The Kwandang waters is one of the main base for small pelagic fisheries in Sulawesi sea. Bigeye scad (Selar crumenophthalmus) is one of species from small pelagic is exploited. The objectives of the research was to estimate the population parameters, exploitation rate and reproductive biology of bigeye scad. Length frequency data were collected from PP Kwandang, from January November 2012. Estimation of population parameters of bigeye scad used FISAT II method. The results showed that growth rate as follows (K) = 0,76 year-1 , L”=24,7 cm. Total mortality rate (Z) = 2,63 year-1, with natural mortality (M) = 1, year-1 and fishing mortality (F) = 1,3 year-1 and exploitation rate (E)=0,51. The exploitation rate are already optimum. Sex ratio of male and female are 1:1,02. The most commonly founded is Gonado Maturity Stage of I. The spawning season of bigeye scad estimated was November and December

scholarly journals ANALISIS PERTUMBUHAN DAN LAJU EKSPLOITASI IKAN TONGKOL ABU-ABU, Thunnus tonggol (Bleeker, 1851) DI PERAIRAN LAUT JAWA

2018 ◽  
Vol 10 (2) ◽  
pp. 95 ◽  
Author(s):  
Yoke Hany Restiangsih ◽  
Thomas Hidayat
Keyword(s):  
Total Mortality ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Research Activity ◽  
Gill Net ◽  
Exploitation Rate ◽  
Java Sea ◽  
Harvest Strategy ◽  
Weight Data ◽  
Longtail Tuna

Tongkol abu-abu atau longtail tuna (Thunnus tonggol) salah satu jenis ikan tuna neritik sebagai target penangkapan armada pukat cincin, jaring isang, dan pancing di Laut Jawa. Penelitian ini bertujuan untuk mengetahui parameter pertumbuhan, umur dan mortalitas ikan tongkol abu-abu untuk penyusunan strategi pengelolaannya. Pengumpulan data frekuensi panjang dan bobot ikan dilakukan di Pelabuhan Perikanan Nusantara (PPN) Pekalongan pada Januari – Nopember 2014. Hasil penelitian menunjukkan hubungan panjang-bobot ikan tongkol abu-abu bersifat isometrik dan indek kecepatan pertumbuhan 3,46/tahun. Ikan dapat tumbuh hingga mencapai panjang asimtotik (L) = 85 cm dengan laju pertumbuhan (K) sebesar 0,4/tahun. Umur teoritis pada saat panjang ikan sama dengan nol (t0) adalah 0,046 tahun. Umur maksimal diduga 15 tahun. Mortalitas alami (M) sebesar 0,61/tahun, mortalitas karena penangkapan (F) 1,01/tahun, mortalitas total (Z) 1,62/tahun. Tingkat eksploitasi (E) sebesar 0,59 berarti bahwa pemanfaatan ikan tongkol abu-abu di Laut Jawa cenderung sudah penuh (fully exploited).Longtail tuna as one of neritic tuna species are commonly caught by purse seine, gill net and hand line in java sea.. This research activity aims to determine population parameters i.e. growth, mortality and its exploitation rate that can contribute to strengthen database on preparation its harvest strategy. The Collecting of length and weight data were conducted at Pekalongan fishing port during period of January to November 2014. The Long-weigth relationship was isometric and growth performance index was 3.46/year. The asymptotic length rate (L) was 85 cmFL, growth rate (K) was 0.4/year and zero age (t0) was 0.046 year. This length is reached allegedly at the 15 years age. Natural mortality (M) was 0.6/year, fishing mortality (F) was 1.01/year, total mortality (Z) was 1.62/yera. The exploitation rate (E) was 0.59, it means exploitation of longtail tuna in the Java Sea tend to highly exploited.

Yield-per-recruit and egg-per-recruit analyses of the Omani abalone, Haliotis mariae

1995 ◽  
Vol 46 (3) ◽  
pp. 663 ◽  
Author(s):  
SA Shepherd ◽  
JL Baker ◽  
DW Johnson
Keyword(s):  
Mortality Rate ◽  
Sexual Maturity ◽  
Egg Production ◽  
Arabian Sea ◽  
Total Mortality ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Northern Arabian Sea ◽  
Size At Sexual Maturity ◽  
Yield Per Recruit

The fecundity, size at sexual maturity, sex ratios and total mortality of Haliotis mariae on the Dhofar coast of the northern Arabian Sea were measured. These data, and estimates of the growth rate, were used for yield-per-recruit and egg-per-recruit analyses. Maximum yields occur at 3+ to 4+ years of age, depending on the natural mortality rate chosen. At the present age at first capture egg production levels are 2-29% of the unfished stock, depending on estimates of the fishing mortality rate and the natural mortality rate, and are considered to be far too low to maintain recruitment. At 40% egg production, of the maximum possible the age at first capture is 4 to 4.5 years, i.e. 105-115 mm shell length, depending on site.

scholarly journals Pola Rekrutmen, Mortalitas, dan Laju Eksploitasi Ikan Lemuru (Amblygaster sirm, Walbaum 1792) di Perairan Selat Sunda

Biospecies ◽  
2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Nidya KARTINI ◽  
Mennofatria BOER ◽  
Ridwan AFFANDI
Keyword(s):  
Total Mortality ◽  
Pelagic Fish ◽  
High Potential ◽  
Biological Information ◽  
Natural Mortality ◽  
Market Demand ◽  
Fishing Mortality ◽  
Fish Resources ◽  
Fish Samples ◽  
Exploitation Rate

Sunda Strait has high potential of pelagic fish resources, one of which is spotted sardinella (Amblygaster sirm). High market demand of spotted sardinella leads to its high exploitation. Management of sustainable used of this species need various biological information of the target species.The aims of this research wereto analyze of therecruitment pattern, mortality, and exploitation rate of spotted sardinella. Sampling was conducted in April to August 2015 from the catchment landed at Labuan Coastal Fishing Port, Banten. Fish samples taken during the study consisted of  527 males and 245 females. The results showed thatpeak recruitment season for spotted sardinella occurs in Maret (11.64%) and July (13.67%).The natural mortality (M), fishing mortality (F), total mortality (Z) for male were 0,33; 5,30; 5,63 year-1 respectively, and for female were 0,51; 7,75;8,27 year-1 respectively. Exploitation rate (E) for male was 0,94 year-1 and for female was 0,93 year-1.Keywords : exploitation, growth, mortality, spotted sardinella, Sunda Strait

scholarly journals STRUKTUR UKURAN DAN BIOLOGI POPULASI RAJUNGAN (Portunus pelagicus Linnaeus, 1758) DI PERAIRAN KEPULAUAN ARU

2018 ◽  
Vol 1 (1) ◽  
pp. 51
Author(s):  
Duranta Diandria Kembaren ◽  
Adi Surahman
Keyword(s):  
Population Biology ◽  
Size Structure ◽  
Carapace Width ◽  
Total Mortality ◽  
Swimming Crab ◽  
Fishing Mortality ◽  
Portunus Pelagicus ◽  
Precautionary Approach ◽  
Exploitation Rate ◽  
Average Size

Penelitian struktur ukuran dan biologi populasi rajungan di perairan Kepulauan Aru telah dilakukan pada Januari-April, Juni dan Agustus-November 2016. Penelitian ini bertujuan untuk mengidentifikasi struktur ukuran dan biologi populasi yang meliputi pertumbuhan, laju kematian, dan tingkat eksploitasi rajungan. Pemahaman struktur ukuran dan biologi populasi dapat dijadikan dasar masukan untuk pengelolaan perikanan. Rata-rata ukuran lebar karapas rajungan yang tertangkap sebesar 136 mm untuk jantan dan 141 mm untuk betina. Rajungan yang tertangkap pada Januari dan Juni memiliki rata-rata ukuran yang lebih besar. Rata-rata rajungan yang tertangkap sudah melawati ukuran matang gonad (Lc = 133,4 mm > Lm = 119,9 mm). Puncak musim pemijahan terjadi pada Februari-Maret dan Agustus-September. Lebar karapas asimtosis (CW) sebesar 185 mm dengan laju pertumbuhan (K) 1,15 tahun-1 serta laju kematian total (Z) 4,94 tahun-1, laju kematian alamiah (M) 1,20 tahun-1 serta laju kematian akibat penangkapan (F) 3,74 tahun-1. Laju eksploitasi sudah berada pada kondisi lebih tangkap (E=0,76). Hasil kajian menyarankan bahwa pengelolaan perikanan rajungan perlu dilakukan secara hati-hati agar sumberdaya ini dapat lestari. Salah satu upaya yang dapat di tempuh adalah dengan menerapkan sistem penutupan musim penangkapan rajungan pada saat terjadinya puncak musim pemijahan yaitu pada Februari-Maret dan Agustus-September. Dengan demikian diharapkan proses regenerasi dan rekrutmen rajungan selalu dapat mendukung ketersedian stok sumberdaya rajungan di perairan Kepulauan Aru ini. Study on the size structure and population biology of blue swimming crab in the waters of Kepualuan Aru was conducted in January to April, June and August to November 2016. The aim of this study was to identify the size structure and population biology i.e. growth, mortality, and exploitation rate of blue swimming crab. Understanding on the size structure and population biology can be used as basic information for managing blue swimming crab fisheries.  Average size of carapace width of blue swimming crab was 136 mm for male and 141 mm for female. Catch on January and June  was bigger size than others months. Length at first capture was higher than length at maturity (Lc = 133,4 mm > Lm = 119,9 mm). Spawning peak season occurs in  February-March and August-September. Asymptotic carapace width (CW) of blue swimming crab was 185 mm with the growth rate (K) was 1,20 year-1, total mortality (Z) was 4,94 year-1, natural mortality (M) was 1,20 year-1, and fishing mortality (F) was 3,74 year-1. Exploitation rate was exceed the sustainability limit (E = 0,76). Thus, it is needed to manage the blue swimming crab fishery with precautionary approach. Based on this study, we suggest to apply the fishing closure system at the peak of spawning season. Thus, the regeneration process and recruitment will support the availability of blue swimming crabs resource in Kepualuan Aru waters.

scholarly journals BEBERAPA PARAMETER POPULASI UDANG PUTIH (Penaeus merguiensis de Mann) DI PERAIRAN TARAKAN, KALIMANTAN UTARA

2017 ◽  
Vol 9 (2) ◽  
pp. 85
Author(s):  
Umi Chodrijah ◽  
Ali Suman
Keyword(s):  
Mortality Rate ◽  
Total Mortality ◽  
Fishing Effort ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Population Parameters ◽  
Spawning Period ◽  
Exploitation Rate ◽  
First Maturity ◽  
Penaeus Merguiensis

Tingkat eksploitasi udang putih (Penaeus merguiensis) sangat intensif. Hal ini terindikasi dengan hasil tangkapan udang di WPP-NRI 716 selama 9 tahun terakhir meningkat. Tujuan penelitian ini untuk mengkaji beberapa parameter populasi dan aspek biologi udang putih di perairan Tarakan. Data panjang karapas dan tingkat kematangan gonad udang putih dikumpulkan dari tempat pendaratan udang di Selumit Pantai, Tarakan, Kalimantan Utara pada Januari sampai dengan November 2016. Pendugaan parameter populasi dengan aplikasi model analisis menggunakan program ELEFAN 1. Hasil penelitian menunjukkan rata-rata ukuran udang putih pertama kali tertangkap (Lc) pada panjang karapas 32,51 mm dan rata-rata ukuran pertama kali matang gonad 33,58 mm. Puncak musim pemijahan terjadi pada Maret dan Agustus. Laju pertumbuhan (K) sebesar 1,33 per tahun (betina) dan 1,55 per tahun (jantan). Laju kematian total (Z) sebesar 7,5 per tahun (betina) dan 8,85 per tahun (jantan), laju kematian alamiah (M) sebesar 1,82 per tahun (betina) dan 2,16 per tahun (jantan) serta laju kematian akibat penangkapan (F) sebesar 5,68 per tahun (betina) dan 6,69 per tahun (jantan). Laju pengusahaan (E) udang putih di perairan Tarakan adalah sebesar 0,76 per tahun. Hal ini menunjukkan tingkat pemanfaatan udang putih telah mengalami lebih tangkap (overfishing). Kondisi ini menggambarkan perlunya dilakukan pengurangan upaya sekitar 52 %.  The banana prawn (Penaeus merguiensis) have been exploited intensively. For instance, within nine years the number of shrimp production in FMA 716 increased dramatically. This research aims to identify the some population parameters of banana prawn in the Tarakan waters. This research was carried out from January to November 2016. Data were analyzed using the analytical model application with ELEFAN I. The result showed that the length at first capture (Lc) of banana prawn was 32,51 mmCL and the length at first maturity (Lm) was 33,58 mm CL. The peak season of spawning period was indicated on March and August. The growth rate (K) was 1,33 /year (female) and 1.55/year (male). Total mortality rate (Z) was 7.5/year (female) and 8,85/year (male), natural mortality rate (M) rate was 1.82/year (female) and 2.16/year (male) and fishing mortality rate ( F) were 5.68/ year (female) and 6.69/year (male). The exploitation rate (E) of banana prawn in the Tarakan waters was 0.76 per year. Therefore, level of existing fishing effort of the banana prawn should reduced about 52 % in the next year.

scholarly journals GROWTH AND EXPLOITATION STATUS (Channa striata Bloch, 1793) IN LUBUK LAMPAM FLOODPLAINS, SOUTH SUMATERA

2013 ◽  
Vol 19 (1) ◽  
pp. 1
Author(s):  
Zulkarnaen Fahmi ◽  
Syarifah Nurdawati ◽  
Freddy Supriyadi
Keyword(s):  
Relative Yield ◽  
Total Mortality ◽  
Fishing Effort ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Population Parameters ◽  
Future Plan ◽  
Channa Striata ◽  
Exploitation Status ◽  
Yield Per Recruit

Due to the economic importance of C. striata in Lubuk Lampam floodplains (Indonesia), this study is aimed to estimate the biological and population parameters required for proposing a future plan to sustain and manage this valuable fish resource. The growth, mortality and explotation ratio of <em>Channa striata</em> estimated by employing FiSATProgramme are reported. The parameters of Von Bertalanffy growth model of 1,529 sample fishes were estimated as K= 0.36/ year, L” = 72.98 cm and to = -0.52 year. The coefficients of total mortality (Z), natural mortality (M) and fishing mortality (F) were 1.72, 0.73 and 0.99 year-1 respectively. Relative yield per recruit analysis shows that the presentexploitation rate (E) was 0.58. Yield per recruit can be maximized at the exploitation ratio of 0.5 and Lc/Linf values of 0.3. The Yield per recruit and biomass per recruit models indicated that, the fisheries status of <em>C. striata</em> in Lubuk Lampam floodplains exceed the limit reference point (Fmax), thus stock of this species in Lubuk Lampam floodplains is indicated being driving down.Reduction in fishing effort and increase number of selective fishing gears are suggested to sustain the fishery of <em>Channa striata</em> in Lubuk Lampam floodplains.

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