Preliminary observation on the sustainability of white sardine, Escualosa thoracata (Valenciennes, 1847), exploited from the central west coast of India

Abstract Background The present study assessed the growth and mortality parameters of the white sardine, Escualosa thoracata which is having high local demand. The white sardine gained importance due to its taste, and high demand in domestic markets as compared to the oil sardine necessitated a study on this resource to know the present status of exploitation level along the central west coast of India. Results A total of 3026 individuals of different size groups of E. thoracata were randomly collected from the Burondi fish landing center of the Ratnagiri district of Maharashtra. The asymptotic length (L∞) and growth coefficient (K) were estimated to be 115 mm and 1.9 year−1, respectively, by ELEFAN-I and 135 mm and 1.2 year−1 by the scattergram. The value of t0 by von Bertalanffy plot was estimated to be −0.000012 year. The fish attained a length of 65 mm, 94 mm, and 114 mm at the end of 0.5, 1, and 1.5 years of its life, respectively. The instantaneous rate of total mortality (Z), natural mortality (M), and fishing mortality (F) were estimated to be 8.07 year−1, 2.55 year−1, and 5.52 year−1, respectively. The exploitation rate (U) was calculated as 0.65, and the exploitation ratio (E) was 0.68. Conclusion The growth, mortality, and other population parameters observed in the present study will help to understand the current stock status, which is pointing toward the over-fishing condition (E ˃ 0.50) of the white sardine in the study area. Therefore, the present investigation suggests reducing the fishing pressure on E. thoracata along the central west coast of India for the sustainability of the resource.

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DAERAHPENANGKAPAN, LAJUPANCINGDANPARAMETERPOPULASI IKAN GINDARA (Lepidocybium flavobrunneum) DI SAMUDERA HINDIA

BAWAL Widya Riset Perikanan Tangkap ◽

10.15578/bawal.8.1.2016.49-56 ◽

2016 ◽

Vol 8 (1) ◽

pp. 49 ◽

Cited By ~ 1

Author(s):

Andi Bahtiar ◽

Abram Barata ◽

Dian Novianto

Keyword(s):

Indian Ocean ◽

Total Mortality ◽

Growth Parameter ◽

Fishing Ground ◽

Fishing Mortality ◽

Length Frequency ◽

Instantaneous Rate ◽

Exploitation Rate ◽

The Indian Ocean ◽

Longline Fisheries

Ikan gindara atau escolar (Lepidocybium flavobrunneum), umumnya tertangkap sebagai hasil tangkapan sampingan (bycatch) pada perikanan rawai tuna Indonesia. Penelitian dilakukan dengan metode observasi onboard pada armada rawai tuna yang berbasis di Pelabuhan Benoa mulai bulan Agustus 2005 - Desember 2009 yang beroperasi di Samudera Hindia. Tujuan penelitian ini adalah memberikan informasi daerah penangkapan, menganalisis parameter populasi (umur, pertumbuhan, mortalitas) dan laju eksploitasi ikan gindara hasil tangkapan kapal rawai tuna di Samudera Hindia. Hasil penelitian menunjukan ikan gindara yang tertangkap oleh kapal rawai tuna menyebar pada posisi geografis antara 90-330 LS dan 760-1270 BT dengan nilai laju pancing (HR) ikan gindara tertinggi pada tahun 2007 sebesar 0,15 dan terendah tahun 2005 yaitu 0,04, atau rata-rata HR sebesar 0,10. Ikan yang tertangkap memiliki ukuran panjang cagak antara 35-193 cm dengan rata-rata 87,4 cm. Parameter populasi yang dianalisa dengan program FiSAT II diperoleh panjang asimtotik (L∞) = 201,60 cmFL, koefisien laju pertumbuhan (K) = 0,21 per tahun dan t0 = -0,4755 tahun. Nilai dugaan mortalitas total (Z) sebesar 0,85 per tahun, nilai dugaan mortalitas alami (M) = 0,37 per tahun dan laju mortalitas penangkapan (F) = 0,48 per tahun. Laju eksploitasi (E = 0,56) menunjukkan bahwa pemanfaatan gindara di Samudera Hindia diatas nilai optimum yang disarankan yaitu E = 0,50.Escolar (Lepidocybium flavobrunneum) commonly caught as bycatch in Indonesia tuna longline fisheries. The study was conducted on August 2005 - December 2009 with onboard observation of tuna longliner based in Benoa fishing port. The objectives of this study are provide information about fishing ground, analyzing parameters of population (age, growth, mortality) and exploitation rate of escolar caught by Indonesia tuna longliner in the Indian Ocean. The results showed that escolar caught by tuna fleets longliner spread on latitude and longitude 900-330 S and 760-1270 E with highest hook rate in 2007 at 0.15 and lowest hook rate occurred in 2005 at 0.04, with average HR at 0.10. Length frequency distribution of escolar were 35-193 cmFL with length average of 87.4 cm. The Von Bertalanffy growth parameter for escolar in Indian Ocean were L∞ = 201.60 cm, K = 0.21 year-1 and t0 = -0,4755 years. The annual instantaneous rate of total mortality (Z) was 0.85 year-1. The natural mortality (M) was 0.37 year-1 and the fishing mortality (F) was 0.48 year-1. The exploitation rate (E = 0.56) indicating that escolar in the Indian Ocean has reached the optimum limit.

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

Ghana Journal of Agricultural Science ◽

10.4314/gjas.v56i1.6 ◽

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.

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ELEFAN Based Population Dynamics of Bombay Duck, Harpadon nehereus Inhabiting the Marine Waters of the West Coast of India

Indian Journal of Animal Research ◽

10.18805/ijar.b-3867 ◽

2020 ◽

Author(s):

Fofandi Mahendrakumar ◽

D Prathibha Rohit

Keyword(s):

West Coast ◽

Size Structure ◽

Growth Parameters ◽

Total Mortality ◽

Fishing Pressure ◽

The West ◽

Growth Coefficient ◽

West Coast Of India ◽

Bombay Duck ◽

Harpadon Nehereus

We studied ELEFAN based population parameters from length-frequency data for Harpadon nehereus collected from different landing centres along the west coast of India. We analyzed the size structure and estimated growth parameters, recruitment, mortality and exploitation rate using FiSAT-II software. The asymptotic length (Lµ = 366 mm), growth coefficient (K = 0.98 year-1), total mortality (Z=3.32 year-1), natural mortality (M=1.6375 year-1), fishing mortality (F=1.6825 year-1), growth performance index (Ø = 3.12) and exploitation ratio (E = 0.51) were worked out for the species. The exploitation ratios were computed as Emax= 0.661, E10= 0.568, E50= 0.345. The length at first capture (Lc50) was estimated at 163.44 mm. The present value of E was found close to appropriate fishing pressure on the stock and a further increase of fishing pressure is not recommended.

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

Indonesian Fisheries Research Journal ◽

10.15578/ifrj.24.2.2018.125-131 ◽

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.

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Population parameters of the pontic shad, Alosa immaculata Bennett, 1835 in the Fatsa coast of the south-eastern Black Sea

Ege Journal of Fisheries and Aquatic Sciences ◽

10.12714/egejfas.36.4.01 ◽

2019 ◽

Vol 36 (4) ◽

pp. 319-324

Author(s):

İsmet Balık

Keyword(s):

Black Sea ◽

Maximum Yield ◽

Total Mortality ◽

Reference Points ◽

Growth Equation ◽

Fishing Mortality ◽

Population Parameters ◽

The South ◽

South Eastern ◽

Exploitation Rate

The aim of this study is to estimate population parameters of pontic shad, Alosa immaculata Bennett, 1835 in the Fatsa coast of the south-eastern Black Sea. A total of 314 pontic shad specimens were collected from study area using artisanal fishing gears from March 2013 to February 2014. In the study, parameters of the von Bertalanffy growth equation were found as L∞=43.05 cm; k=0.430 per year and t0=-0.451 year. The growth performance index (Φ') was estimated as 2.90. The total mortality (Z), natural mortality (M), fishing mortality rates (F) were calculated as 1.33 year-1, 0.75 year-1 and 0.58 year-1, respectively. The annual instantaneous fishing mortality rate was greater than both the target (Fopt=0.375 year-1) and limit (Flimit=0.50 year-1) biological reference points. Similarly, the present level of exploitation rate (E=0.43) was higher than the exploitation ratio for maximum yield per recruit (Emax=0.375) suggesting that overexploitation occurred. These results showed that this species has been over-exploited in the Fatsa coast of the south-eastern Black Sea. Measures should be taken to reduce the current exploitation rate for sustainable fishing of pontic shad in the Fatsa coast of the south-eastern Black Sea.

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

BAWAL Widya Riset Perikanan Tangkap ◽

10.15578/bawal.6.2.2014.111-117 ◽

2015 ◽

Vol 6 (2) ◽

pp. 111 ◽

Cited By ~ 1

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

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PARAMETER POPULASI IKAN BETOK (Anabas testudineus (BLOCH, 1792)) DI EKOSISTEM PAPARAN BANJIR SUNGAI MUSI, Lubuk Lampam

BERITA BIOLOGI ◽

10.14203/beritabiologi.v18i1.3107 ◽

2019 ◽

Vol 18 (1) ◽

Cited By ~ 1

Author(s):

Syarifah Nurdawati ◽

Zulkarnaen Fahmi ◽

Freddy Supriyadi

Keyword(s):

Growth Parameters ◽

Total Mortality ◽

Fish Length ◽

Fishing Mortality ◽

Anabas Testudineus ◽

Weight Growth ◽

Exploitation Rate ◽

Management Policies ◽

Distribution Of Fish ◽

Musi River

Anabas testudineus Bloch, 1792 is economically important fish species found in Lubuk Lampam floodplains of Musi River. Fishing activities that take place throughout the year can affect reproduction patterns and recruitment (new additions) of fish. This study aims to evaluate several parameters of betok fish populations that can be used as input for fish resource management policies in floodplains of Musi river. A total of 3271 samples of betok fish caught by fishermen from March to November 2011 were collected to obtain data on fish length and weight. Growth parameters (L∞, K, Z dan M) were calculated using FiSAT II based on the length frequency distribution of fish. The values of L∞ and K were obtained at 204.75 mm and 0.24 / year respectively while the maximum age of fish was estimated to be 4.36 years. The total mortality (Z) and natural mortality (M) of betok fish is 0.99 / year and 0.42 / year, Fishing mortality (0.56/year). The exploitation rate (0.57) was slightly lower than the predicted value (Emax= 0.69) indicating that Anabas testudineus was near fully exploited in the Lubuk Lampam floodplain ecosystem.

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

BAWAL Widya Riset Perikanan Tangkap ◽

10.15578/bawal.10.2.2018.95-104 ◽

2018 ◽

Vol 10 (2) ◽

pp. 95 ◽

Cited By ~ 1

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.

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Estimating some population parameters and stock assessment of Dark Sleeper Odontobutis potamophila in the Gaosha River, Wuyuan County, Jiangxi Province, China

Indian Journal of Animal Research ◽

10.18805/ijar.v0iof.9139 ◽

2017 ◽

Author(s):

Wu Bin Wang Haihua ◽

Fu Huiyun Zhang Yanping

Keyword(s):

Growth Parameters ◽

Stock Assessment ◽

Total Mortality ◽

Landing Site ◽

Jiangxi Province ◽

Recruitment Pattern ◽

Growth Coefficient ◽

West Part ◽

Exploitation Rate ◽

Odontobutis Potamophila

A study was conducted to investigate the growth parameters, mortality and recruitment pattern of Odontobutis potamophila collected in the Gaosha river fish landing site, west part of Wuyuan County (Latitude: 29° 14' 29" N, Longitude: 117° 45' 49" E). O.potamophila were collected from November, 2013 to October, 2014. Growth parameters, asymptotic length (L) = 192mm and growth coefficient (k) = 0.22 year-1. Growth performance index(Ø’) =3.91, total mortality (Z) = 0.72 year-1, natural mortality (M) = 0.32 year-1, fishing mortality (F) = 0.40 year-1 and exploitation rate (E) = 0.55year-1.The estimated exploitation rate (E) has slightly exceeded the optimum value of E indicating this species was sustainable exploitation in the study area. The exploitation ratios were computed as Emax= 0.61, E10= 0.52, E50= 0.34. The length at first capture at 50%, (Lc) was 77 mm. The recruitment pattern of the species was found continuous all-round the year with one peak. The observation of the annual recruitment of O.potamophila found to occur from May to July. Steady biomass also increased with length class until 121-125 mm, and the total steady state biomass was found to be 2240 kg.

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Population dynamics of Mormyrus rume (Valenciennes, 1847; Osteoglossiformes; Mormyridae) Of Ikere-Gorge, Iseyin, Oyo State, Nigeria

Global Journal of Agricultural Sciences ◽

10.4314/gjass.v19i1.7 ◽

2020 ◽

Vol 19 (1) ◽

pp. 51-57

Author(s):

Stephen O. Ajagbe ◽

Folashade. F. Ojo-fakuade

Keyword(s):

Growth Parameters ◽

Management Strategies ◽

Total Mortality ◽

Mesh Size ◽

Fish Population ◽

Population Parameters ◽

Growth Coefficient ◽

Exploitation Rate ◽

Length Frequency Data ◽

Mormyrus Rume

The structure of a fish population is determined by the equilibrium between growth, recruitment and total mortality. But, there is paucity of information on the growth and mortality of Mormyrus rume in Nigeria. Therefore this study is needful to determine its population parameters, with a view of evolving management strategies for its sustainable exploitation. Estimates of population parameters of Mormyrus rume were obtained from length-frequency data of 836 individuals collected monthly for a period of 24 months from January 2017 to December 2018. The estimated growth parameters were: asymptotic length (L∞) was 100.8cm; growth coefficient (K) was 0.62/year; growth performance (Ɵ) was 3.8; length at maturity (Lm) was 52.57cm; reproductive load (Lm/L∞) was 0.52 and optimum length (Lopt) was 65.10cm. Likewise, natural, fishing and total mortalities were 0.93, 1.46 and 2.39 respectively. The values of exploitation rate (0.61) and ratio of total mortality and growth coefficient (3.85) showed that Mormyrus rume is most exploited in Ikere-gorge. Therefore, appropriate fishing regulations should be enforced to regulate fishing gears and mesh size that will fish Mormyrus rume at sustainable level. Keywords: Recruitment, mortality, growth, exploitation, length

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