scholarly journals Stock Assessment of Exploited Sardine Populations from Northeastern Bay of Bengal Water, Bangladesh Using the Length-Based Bayesian Biomass (LBB) Method

2021 ◽  
Vol 9 (10) ◽  
pp. 1137
Author(s):  
Partho Protim Barman ◽  
Qun Liu ◽  
Md. Abdullah Al-Mamun ◽  
Petra Schneider ◽  
Mohammad Mojibul Hoque Mozumder
Keyword(s):  
Bay Of Bengal ◽  
Stock Assessment ◽  
Mesh Size ◽  
Length Frequency ◽  
Optimum Length ◽  
Stock Status ◽  
Fisheries Resources ◽  
Fishing Gears ◽  
The Status

Stock assessment is necessary to understand the status of fishery stocks. However, for the data-poor fishery, it is very challenging to assess the stock status. The length-based Bayesian biomass (LBB) technique is one of the most powerful methods to assess the data-poor fisheries resources that need simple length frequency (LF) data. Addressing the present gap, this study aimed to assess the stock status of three sardines (Sardinella fimbriata, Dussumieria acuta, and D. elopsoides) in the Bay of Bengal (BoB), Bangladesh using the LBB method. The estimated relative biomass for S. fimbriata was B/B0 < BMSY/B0, indicating the overfished biomass, while the assessed B/B0 > BMSY/B0 for D. acuta and D. elopsoides indicates healthy biomass. Additionally, for S. fimbriata, the length at first landing was smaller than the optimum length at first landing (Lc < Lc_opt), indicating an overfishing status, but a safe fishing status was assessed for D. acuta and D. elopsoides (Lc > Lc_opt). Therefore, increasing the mesh size of fishing gears may help to ensure the long-term viability of sardine populations in the BoB, Bangladesh.

scholarly journals Stock Assessment for Seven Fish Species Using the LBB Method from the Northeastern Tip of the Bay of Bengal, Bangladesh

2021 ◽  
Vol 13 (3) ◽  
pp. 1561
Author(s):  
Md. Abdullah Al-Mamun ◽  
Qun Liu ◽  
Sayedur Rahman Chowdhury ◽  
Md. Sharif Uddin ◽  
K. M. Shahriar Nazrul ◽  
...  
Keyword(s):  
Bay Of Bengal ◽  
Stock Assessment ◽  
Fish Stock ◽  
Marine Fishery ◽  
Fishery Resources ◽  
Fisheries Resources ◽  
Pampus Argenteus ◽  
Management Measures ◽  
The Status ◽  
Length Frequency Data

Assessment of fish stock status is generally required for fisheries management, which is difficult when the data are limited. The length-based Bayesian Biomass (LBB) approach is a powerful and new method, where only the length-frequency data are used for estimating the status of fisheries resources. Here, we applied the LBB method to assess the status of seven commercially valuable marine fishes from the northern tip of the Bay of Bengal (BoB), Bangladesh. These species were Lepturacanthus savala, Pampus argenteus, Nemipterus japonicas, Nemipterus randalli, Ilisha filigera, Saurida tumbil, and Upeneus sulphurous. The current relative biomass (B/B0) ratios were smaller than the BMSY/B0 in five stocks, except for N. japonicas and N. randalli, and this indicates that, of the seven populations assessed, two are grossly overfished, three are overfished, and two are healthy stocks. Moreover, the length at first capture (Lc) was lower than the optimal length at first capture (Lc_opt) in all seven populations, which indicates growth overfishing, suggesting that increasing the mesh sizes would be beneficial. The present findings confirm that Bangladesh’s coastal water fishery resources are declining. More specific targeted management measures should be taken to recover the country’s marine fishery resources.

Chesapeake Bay Stock Assessment: Who are they, and Where are they?

1992 ◽  
Vol 26 (12) ◽  
pp. 2705-2709 ◽  
Author(s):  
H. M. Austin
Keyword(s):  
Chesapeake Bay ◽  
Stock Assessment ◽  
Human Consumption ◽  
Population Fluctuations ◽  
Important Species ◽  
Fisheries Resources ◽  
Environmentally Sensitive ◽  
Climate Scale ◽  
Resource And Environment

The Chesapeake Bay, while a significant habitat for fisheries resources, is in actuality an aquatic “bedroom community”, as many of the economically important species are seasonally transient. The pressure on these resources due to their demand for human consumption and recreation, proximity to extensive industrial activity along the shores, and climate scale environmental fluctuations has resulted in stock declines by most important species. Our inability to separate natural population fluctuations from those of anthropogenic origin complicates management efforts. The only way to make these separations, and subsequent informed management decisions is by supporting long-term stock assessment programs (monitoring) in the Bay which allow us to examine trends, cycles and stochastic processes between resource and environment. These programs need to monitor both recruitment and fishing mortality rates of the economically important species, and to identify and monitor the environmentally sensitive “canary” species.

scholarly journals Stock Assessment of 19 Perciformes in the Beibu Gulf, China, Using a Length-Based Bayesian Biomass Method

2021 ◽  
Vol 8 ◽  
Author(s):  
Gang Hou ◽  
Hui Zhang ◽  
Jinrun Wang ◽  
Yanying Chen ◽  
Jianbin Lin
Keyword(s):  
Stock Assessment ◽  
Beibu Gulf ◽  
Limited Data ◽  
Length Frequency ◽  
Optimum Length ◽  
New Approach ◽  
Fish Stocks ◽  
Fish Resources ◽  
Fishery Resources ◽  
The Mean

The Beibu Gulf in China is rich in fish resources. However, only a small number of commercially developed fish stocks have been specifically assessed owing to limited data and expertise. In this study, 19 perciform fish populations in the Beibu Gulf were assessed using a length-based Bayesian biomass (LBB) estimator method, which is a new approach to evaluate a fishery’s status using length frequency (LF) data. The results showed that only 21% of the evaluated stocks were healthy and 79% were overfished. In particular, 26 and 21% of the assessed species had collapsed and were grossly overfished, respectively. Only 11 and 21% of the assessed species were slightly overfished and overfished, respectively. The ratios between the mean and optimum length (Lmean/Lopt) and between the mean length at first capture and the mean length, which maximizes catch and biomass (Lc/Lc_opt), were below one in 14 out of the 19 stocks, suggesting a truncated length structure and fishing of undersized individuals. The ratio of the 95th percentile length to asymptotic length L95th/Linf was close to one (&gt;0.9) in 10 of 19 stocks, suggesting that at least some large fish were still present. Our research confirmed that the fishery resources in the Beibu Gulf were seriously overfished and provided evidence that LBB was an efficient method to evaluate the fishery resources. Fishery managers need to take specific measures to restore fishery resources.

scholarly journals Length-Based Stock Assessment of Smith's Barb, Puntioplites proctozystron (Bleeker, 1865) (Cyprinidae) and Asian Redtail Catfish, Hemibagrus nemurus, (Valenciennes, 1840), (Bagridae) in a Multipurpose Reservoir in Thailand

2021 ◽  
Vol 34 (2) ◽  
Author(s):  
KAJITPAN CHARERNNATE ◽  
PAVAROT NORANARTTRAGOON ◽  
TUANTONG JUTAGATE ◽  
Keyword(s):  
Growth Parameters ◽  
Stock Assessment ◽  
Relative Yield ◽  
Mesh Size ◽  
Fish Stock ◽  
Fish Stocks ◽  
The Status ◽  
Curvature Parameter ◽  
Spawning Potential Ratio ◽  
Fish Stock Assessment

Catches from inland fisheries in Thailand are about 200,000 tonnes annually and plays an important role in food security and subsidiary income. However, fish stocks are seldom assessed because of the lack of catch and effort data. In this study, two fish stock assessment models, viz., relative yield per recruit and length-based spawning potential ratio, were used to evaluate the status of two species as well as to highlight their applications to datalimited situation in Thailand. The study was conducted at Kangkrajan Reservoir, Thailand, for two targeted species, viz., Smith's barb, Puntioplites proctozystron (Bleeker, 1865) and Asian redtail catfish, Hemibagrus nemurus (Valenciennes, 1840) using length frequency data. The data were collected throughout 2019. Both species showed isometric growth. Von Bertalanffy growth parameters were estimated. Asymptotic length, curvature parameter and theoretical age at length zero were 36.2 cm TL, 0.39 yr-1 and -0.28 yr for P. proctozystron, respectively, and 63.2 cm TL, 0.37 yr-1 and -0.32 yr for H. nemurus. The exploitation rates reveal that both species are slightly overfished. Sizes at 50 % maturity and 50 % selectivities were 17.8 and 23.5 cm TL for P. proctozystron, respectively, and 15.6 and 20.8 cm TL for H. nemurus. Considering both parameters, the size at first capture to sustain the fisheries of P. proctozystron and H. nemurus should be >18 cm and >30 cm, respectively, which can be achieved by mesh-size regulations.

The use of marine reserves in evaluating the dive fishery for the warty sea cucumber (Parastichopus parvimensis) in California, U.S.A.

2001 ◽  
Vol 58 (9) ◽  
pp. 1773-1781 ◽  
Author(s):  
Stephen C Schroeter ◽  
Daniel C Reed ◽  
David J Kushner ◽  
James A Estes ◽  
David S Ono
Keyword(s):  
Stock Assessment ◽  
Marine Reserves ◽  
Dependent Data ◽  
Fishing Mortality ◽  
Catch Per Unit Effort ◽  
Before And After ◽  
The Status ◽  
Long Term Monitoring ◽  
Term Monitoring

Management of sustainable fisheries depends upon reliable estimates of stock assessment. Assessment of many stocks is based entirely on fishery-dependent data (e.g., catch per unit effort), which can be problematic. Here we use fishery-independent data on stock size, collected within and outside of no-take reserves before and after the onset of fishing, to evaluate the status of the dive fishery for warty sea cucumbers, Parastichopus parvimensis, in southern California. Long-term monitoring data showed that abundance decreased throughout the Channel Islands within 3–6 years after the onset of fishing. No significant changes in the abundance of P. parvimensis were observed at the two non-fished reserve sites, although densities tended to increase following onset of the fishery. Before–after, control–impact (BACI) analyses of seven fished and two non-fished sites implicated fishing mortality as the cause of 33–83% stock declines. In sharp contrast, stock assessment based on CPUE data showed no declines and a significant increase at one island. To date, most discussion on marine reserves has focused on the protection and enhancement of exploited populations. Our study demonstrates the critically important, but often overlooked, role that marine reserves can play in providing reliable information on stock assessment.

scholarly journals Population dynamics of Chrysichthys nigrodigitatus (Lacépède, 1803) in Ikere-gorge, Oyo State, Nigeria

2021 ◽  
Vol 56 (1) ◽  
pp. 79-86
Author(s):  
S.O. Ajagbe ◽  
D.O. Odulate ◽  
R.O. Ajagbe ◽  
O.S. Ariwoola ◽  
F.I. Abdulazeez ◽  
...  
Keyword(s):  
Assessment Tool ◽  
Growth Parameters ◽  
Stock Assessment ◽  
Total Mortality ◽  
Fishing Mortality ◽  
Length Frequency ◽  
Optimum Length ◽  
Growth Coefficient ◽  
Exploitation Rate ◽  
Length Frequency Data

The growth and mortality parameters of Chrysichthys nigrodigitatus were estimated to assess the sustainability of its exploitation in Ikere-gorge, Oyo State, Nigeria. A total of 1210 of Chrys­ichthys nigrodigitatus were sampled from fishermen catches between January, 2017 and Decem­ber, 2018. C. nigrodigitatus were exploited with gillnet, cast net and traps (Malian trap net and bamboo). Total lengths were measured with fish measuring board. The FAO-ICLARM Stock Assessment Tool (FiSAT II) software was used to analyze length-frequency data of the fish. The estimated growth parameters are: asymptotic length is 60.9 cm, growth coefficient is 0.96, optimum length is 38.51 cm; length at maturity is 33.44 cm while length-at-first-capture is 12.62 cm. The estimated mortality parameters are: total mortality is 3.29 per year, natural mortality is 1.43 per year and fishing mortality is 1.86. It was observed that C. nigrodigitatus of Ikere-gorge were more vulnerable to exploitation at sizes less than their length at maturity. Likewise, the ex­ploitation rate (E = 0.57 yr-1) is greater than sustainable exploitation rate (Emax = 0.46 yr-1). This shows that exploitation of C. nigrodigitatus in Ikere-gorge is not sustainable. Therefore, there is need to reduce fishing pressure on C. nigrodigitatus to ensure its sustainability in Ikere-gorge.

scholarly journals STATUS KEBERLANJUTAN KETERSEDIAAN SUMBERDAYA PERIKANAN CAKALANG (Katsuwonus pelamis) DI PERAIRAN ACEH BARAT

2015 ◽  
Vol 2 (2) ◽  
Author(s):  
Edwarsyah Edwarsyah ◽  
Mohamad Gazali
Keyword(s):  
Multidimensional Scaling ◽  
Fisheries Management ◽  
Local Community ◽  
Skipjack Tuna ◽  
Katsuwonus Pelamis ◽  
Sustainability Index ◽  
Fisheries Resources ◽  
Fishing Gears ◽  
The Status ◽  
Index Value

Fisheries production in West of Aceh was still insufficient to provide the local community consumption. However, fisheries resources in  West of Aceh water  are abundant. But utilization of fisheries particularly skipjack tuna (cakalang) hasn’t been yet optimalized. This aiming to analyse the status of sustainablity of skipjack (Katsuwonus pelamis) fisheries in West of Aceh water.  The study was conducted in November to Desember 2012 at the Fish Landing  Port of  Kuala Bubon  and Fish Landing Bases (PPI) Ujong Baroh. The result shown that sustainability index value by using multidimensional scaling is 88,42 with stress value is  0.12 and coefisien of determination (R2) is 0,95 or 95%. Such index value show that sustainablity of skipjack resources were good status. It means that multidimensional of skipjack stock were still paid attention in fisheries management sustainable. Beside that, it shown from water condition and fishing gears were still support viability of such comodity.

scholarly journals Stock status of coconut crab (Birgus latro) in Daeo, Morotai Island District, North Maluku, Indonesia

2021 ◽  
Vol 22 (2) ◽  
Author(s):  
Rugaya Serosero ◽  
SULISTIONO SULISTIONO ◽  
NURLISA A. BUTET ◽  
ETTY RIANI
Keyword(s):  
Data Analysis ◽  
Confidence Interval ◽  
Population Size ◽  
Growth Parameters ◽  
Human Consumption ◽  
Length Frequency ◽  
Growth Coefficient ◽  
Male And Female ◽  
Stock Status ◽  
The Status

Abstract. Serosero RH, Sulistiono, Butet NA, Riani E. 2021. Stock status of coconut crab (Birgus latro) in Daeo, Morotai Island District, North Maluku, Indonesia. Biodiversitas 22: 626-634. The populations of coconut crabs (Birgus latro) in nature continue to decline due to their simple capture for human consumption. This study aimed to determine the status of coconut crab stock in Daeo, Morotai Island Regency, North Maluku, Indonesia including estimations of growth parameters and population size. This research was conducted from October 2016 to September 2017. Growth parameters were estimated based on 12 monthly length-frequency samples. Data analysis was carried out using the ELEFAN I method on the FiSAT II program for estimating growth parameters, and the Schnabel method for estimating population size. The results showed that the level of exploitation of male and female coconut crabs in Daeo was high (E > 0.5). The asymptotic length L∞ for males was 56.96 mm thoracic length (TL) and that of females 52.50 mm TL. The growth coefficient K for males was 0.14 and that for females 0.16. Length to is -1.026 (male) and -0.913 (female). The results generated using the Schnabel method suggested that the population size of the coconut crab in Daeo was 7,466 to 73,948 individuals considering a confidence interval of 95%. The recapture of tagged coconut crabs was merely 0. 82%.

scholarly journals Lumpers or splitters? Evaluating recovery and management plans for metapopulations of herring

2009 ◽  
Vol 66 (8) ◽  
pp. 1776-1783 ◽  
Author(s):  
Laurence T. Kell ◽  
Mark Dickey-Collas ◽  
Niels T. Hintzen ◽  
Richard D. M. Nash ◽  
Graham M. Pilling ◽  
...  
Keyword(s):  
Stock Assessment ◽  
Population Analysis ◽  
Stock Status ◽  
Virtual Population Analysis ◽  
Virtual Population ◽  
Management Plans ◽  
Management Area ◽  
Term Management

Abstract Kell, L. T., Dickey-Collas, M., Hintzen, N. T., Nash, R. D. M., Pilling, G. M., and Roel, B. A. 2009. Lumpers or splitters? Evaluating recovery and management plans for metapopulations of herring. – ICES Journal of Marine Science, 66: 1776–1783. The long-term management of a stock representing a metapopulation has been simulated in a case study loosely based upon herring to the west of the British isles, where stocks are currently assessed and managed by management area, although there is evidence of mixing between stocks (in terms of connectivity, migrations, and exploitation). The simulations evaluate scientific advice (based on virtual population analysis, VPA) and the sustainability of fishing under two population-structure scenarios, corresponding either to discrete stocks, which only mix on the feeding grounds, or where diffusion between stocks takes place. The ability of stock assessment to monitor stock status and exploitation levels was evaluated for defining stocks based on fishing areas and for stocks that combined fishing areas. The study showed that assessment based on VPA of the metapopulation could fail to detect overexploitation of stocks and fail to detect and distinguish between the effects of exploitation and regime shifts.

scholarly journals MONITORING PERIKANAN LEMURU DI PERAIRAN SELAT BALI

2018 ◽  
Vol 7 (1) ◽  
pp. 130-140
Author(s):  
Satria Wiratama Nugraha ◽  
Abdul Ghofar ◽  
Suradi Wijaya Saputra
Keyword(s):  
Mesh Size ◽  
Regulatory Compliance ◽  
Maximum Sustainable Yield ◽  
Production Model ◽  
Purse Seine ◽  
Catch Per Unit Effort ◽  
Total Allowable Catch ◽  
Unit Effort ◽  
Fishing Gears ◽  
The Status

Perairan Selat Bali merupakan perairan yang berada diantara Pulau Jawa dan Pulau Bali. Perairan ini memiliki sumber daya perikanan pelagis kecil yang melimpah, terutama ikan lemuru. Pendaratan ikan lemuru di Perairan Selat Bali berpusat di UPT PP (Unit Pelaksana Teknis Pelabuhan Perikanan) Muncar, Kabupaten Banyuwangi. Penelitian ini bertujuan untuk mengetahui jumlah dan ukuran kapal, serta alat bantu penangkapan, Catch Per Unit Effort penangkapan, dan pengelolaan  perikanan lemuru di perairan Selat Bali. Penelitian ini dilaksanakan pada tanggal 20 Maret – 21 Mei  2017. Metode yang digunakan adalah observatif. Data yang digunakan adalah data produksi ikan lemuru di  UPT PP Muncar dan PPN (Pelabuhan Perikanan Nusantara) Pengambengan dari tahun 1980-2016, data kapal dan alat tangkap dari tahun 2010-2016. Berdasarkan data tersebut, dilakukan perhitungan Maximum Sustainable Yield (MSY) dengan menggunakan model surplus produksi Gordon Scheafer. Jumlah kapal yang digunakan untuk penangkapan ikan lemuru saat ini adalah 326 armada dengan ukuran 10-30 GT (gross ton) yang didominasi oleh kapal ukuran 29/30 GT . Jumlah kapal 10 – 30 GT di Muncar 190 unit, sedangkan di Pengambengan 136 unit. Alat tangkap yang digunakan adalah purse seine dengan jumlah 326 dengan panjang 180 depa ( ± 338 meter) dan mesh size 0,5 inchi, dengan rata – rata kekuatan mesin 120 – 240 PK, lampu 700 - 1200 watt sebanyak 5 – 12 unit / kapal. Nilai CPUE terendah adalah 0,378 ton/trip, dengan rata – rata 3,43 ton/ trip. Nilai MSY yang didapatkan sebesar 25.107,32 ton/tahun, sementara nilai JTB (Jumlah Tangkapan Diperbolehkan) adalah 20.085,86 ton per tahun. Perairan Selat Bali berada dalam otonomi Pemerintah Provinsi Jawa Timur, dan Provinsi Bali. Sehingga pada tahun 1977 dikeluarkan Surat Keputusan Bersama Gubernur Jawa Timur, dan Gubernur Bali, untuk mengatur sistem penangkapan ikan di Perairan Selat Bali. Surat Keputusan Bersama ini diperbarui beberapa kali, kemudian dikeluarkan Peraturan Menteri Kelautan Perikanan dan Kelautan Nomor 68 Tahun 2016 tentang Rencana Pengelolaan Perikanan  Ikan Lemuru di Wilayah Pengelolaan Perikanan Republik Indonesia.   Bali Strait waters is a located between Java Island and Bali Island. This waters has a lot of pelagic fish resources, especially lemuru fish. Lemuru fisheries centered on UPT PP ( Unit Techic Implementers Fisheries Port) Muncar, Banyuwangi Region. This research goals are to knows the amount of  boat and it size, total fishing gears, Catch Per Unit Effort lemuru fisheries on Bali Strait waters, and know the status of lemuru fishings. This research held on 20 Maret – 21 Mei 2017. The method of the research is observative. The data wich used is the data  production of lemuru fishing on UPT PP Muncar and PPN (Archipelago Fisheries Port) Pengambengan on 1980 -2016, boats data and fishing gears on 2010 – 2016. Based on the data, calculating MSY using surplus production model by Gordon Scheafer. Total boats for lemuru fishes are 326 boats, wich sizes 10-30 GT (gross tonnage) and dominated by 29/30 GT . The boats 10 – 30 GT in Muncar 190 units, event on Pengambengan 136 units. Fishing gears using purse seine wich 326 units, width 180 depa ( ± 338 meters) and mesh size 0,5 inchi, wich average powers 120 – 240 PK, lightning 700 - 1200 watt  5 – 12 units / boats. The value of lowest  CPUE is 0,378 ton/trip, with average is 3,43 ton/trip. The value of MSY is 25.107,32 ton/year, and TAC (Total Allowable Catch) is 20.085,86 ton/year. Bali Strait waters under otonomy by East Java and Bali Government. So, in 1977 formed GRC (Government Regulatory Compliance) by East Java and Bali Government to ruled fisheries systems on Bali Strait waters. This GRC renew few times, and then formed Regulation by Minister of Marine and Fisheries number 68 year 2016 about Plans Management Fisheries of Lemuru Fish in Indonesia Region Management.

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