Some Biological Parameters of Yellowfin Tuna (Thunnus albacares) from the Handline Fishery in the Eastern Part of the Banda Sea

Abstract Export quality yellowfin tuna (Thunnus albacares) from the handline fishery in the Banda Sea (Ambon and Seram) is vital in supporting coastal communities. To ensure its sustainability, information on their biological parameters is essential, especially for harvest strategy purposes. A combination of port sampling and fisheries surveys were conducted from January to October 2016 to monitor the catch, effort, size (length and weight), and maturity level of yellowfin tuna. An equal catch proportion of yellowfin and bigeye tuna was found during surveys in Masohi, Seram Island. In contrast, two-thirds of the catch landed in Ambon was dominated by yellowfin tuna. The catch rate varied between 25.5-71.9 kg/day. Length of samples distributed between 65-152 cm FL (mode=104 cm FL), whereas estimated live weight ranged from 6.12-148.92 kg. Both females (W=0.000001*FL3.7190) and males (W=0.000001*FL3.7438) possessed allometric growth. The proportion of males was twice that of females (1: 0.5), where most (47%) of samples were found to be mature. The estimated total mortality (Z) is 1.04/year, with the natural mortality (M) and fishing mortality (F) is around 0.55/year and 0.49/year, respectively. The stock condition allegedly reaching its optimum level tagged by the length at first caught (Lc) was slightly higher in comparasion to length at first maturity (Lm50 ) and utilization rate (E) below 0.55/year.

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STATUS PERIKANAN HUHATE (POLE AND LINE) DI BITUNG, SULAWESI UTARA

Jurnal Penelitian Perikanan Indonesia ◽

10.15578/jppi.14.3.2008.313-320 ◽

2017 ◽

Vol 14 (3) ◽

pp. 313 ◽

Cited By ~ 1

Author(s):

Budi Nugraha ◽

Enjah Rahmat

Keyword(s):

Yellowfin Tuna ◽

Fishing Ground ◽

Thunnus Albacares ◽

Skipjack Tuna ◽

Katsuwonus Pelamis ◽

Coryphaena Hippurus ◽

North Sulawesi ◽

The Status ◽

Catch Composition ◽

First Maturity

Tulisan ini menyajikan tentang status perikanan huhate di Bitung meliputi deskripsi unit penangkapan, daerah penangkapan, komposisi hasil tangkapan, catch per unit of effort, dan ukuran ikan pertama kali tertangkap. Data dikumpulkan selama tahun 2004 sampai dengan 2005. Hasil penelitian menunjukkan bahwa huhate yang terdapat di Bitung dioperasikan dengan kapal penangkapan yang terbuat dari kayu berukuran 50 sampai dengan 80 GT. Daerah penangkapan di sekitar lokasi rumpon di Laut Sulawesi dan Laut Maluku. Hasil tangkapan yang diperoleh terdiri atas cakalang (Katsuwonus pelamis), madidihang (Thunnus albacares), baby tuna (Thunnus spp.), dan tongkol (Auxis spp.) serta hasil tangkapan sampingan yaitu lemadang (Coryphaena hippurus) dan sunglir (Elagatis bipinnulatus). Hasil analisis catch per unit of effort diperoleh bahwa nilai catch per unit of effort baby tuna (Thunnus spp.) mengalami kenaikan pada bulan Agustus 2004, dan cakalang (Katsuwonus pelamis) mengalami kenaikan pada bulan September 2004. Hasil analisis terhadap ukuran pertama kali cakalang (Katsuwonus pelamis) tertangkap oleh huhate 49,3 FLcm. Ukuran ini lebih panjang dibandingkan ukuran pertama kali cakalang (Katsuwonus pelamis) matang gonad. Sedangkan hasil analisis terhadap ukuran pertama kali madidihang (Thunnus albacares) tertangkap oleh huhate 51,6 FLcm. Ukuran ini lebih pendek dibandingkan ukuran pertama kali madidihang (Thunnus albacares) matang gonad. This paper presents the status of pole and line fishery in Bitung of North Sulawesi, consisting of description of fishing gear, fishing ground, catch composition, catch per unit of effort, and length at first capture. Data were collected during the period of 2004 until 2005. Results show that the pole and line in Bitung operated by wooden vessels of 50 until 80 GT. The fishing grounds were the waters around FADs location in Sulawesi Sea and Maluku Sea. Catch composition consists of skipjack tuna (Katsuwonus pelamis), yellow fin tuna (Thunnus albacares), baby tuna (Thunnus spp.), and frigate tuna (Auxis spp.), while the bycatch consisted of dolphinfish (Coryphaena hippurus) and rainbow runner (Elagatis bipinnulatus). Catch per unit of effort analysis shows that catch per unit of effort value of baby tuna (Thunnus spp.) increased on August 2004, whereas catch per unit of effort value of skipjack tuna (Katsuwonus pelamis) increased on September 2004. The length at first capture of skipjack tuna (Katsuwonus pelamis) was 49,3 FLcm. The catch size was bigger than the length at first maturity for skipjack tuna (Katsuwonus pelamis). The length at first capture of yellowfin tuna (Thunnus albacares) was 51,6 FLcm. This catch size was smaller than the length at first maturity for yellowfin tuna (Thunnus albacares).

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Population characteristics and exploitation of yellowfin tuna (Thunnus albacares Bonnaterre, 1788) in the coastal waters of Kenya

Western Indian Ocean Journal of Marine Science ◽

10.4314/wiojms.v20i1.9 ◽

2021 ◽

Vol 20 (1) ◽

pp. 95-109

Author(s):

Edward Kimakwa ◽

Micheni Ntiba ◽

Agnes Muthumbi

Keyword(s):

Coastal Waters ◽

Growth Parameters ◽

Total Mortality ◽

Mortality Rates ◽

Yellowfin Tuna ◽

Population Characteristics ◽

Thunnus Albacares ◽

Catch Per Unit Effort ◽

Length Frequency ◽

South West Indian Ocean

Yellowfin tuna, Thunnus albacares (Bonnaterre, 1788) is a highly migratory and important commercial fishery species. Data on length-frequency, growth parameters and mortality rates of yellowfin tuna in the coastal waters of Kenya is limited. We assessed Catch Per Unit Effort (CPUE), size distribution, growth parameters and mortality rates based on length-frequency and catch data collected from August 2015 to December 2016 at five fish landing sites along the Kenyan coast. The sample comprised of 1281 individuals of yellowfin tuna weighing 12,671 kg. Highest CPUE was recorded in October 2015 (10.8 kg·Fisher-1Trip-1) and lowest CPUE, 2.6 kg·Fisher-1Trip-1 in December 2016. Yellowfin tuna was more abundant in the South-East Monsoon (SEM), from May to October, with an average CPUE of 7.3 kg Fisher-1Trip-1 compared to North East Monsoon (NEM), from November to April, with a CPUE of 7.0 kg Fisher-1Trip-1. Spatial variation of CPUE was evident. Old Town recorded the highest CPUE of 54.2 kgTrip-1, while Mnarani the lowest of 19.4 kgTrip-1. At least 91 % of the fish sampled were < 100 cm FL and hence not yet mature. The asymptotic Length (L∞) was found to be 195 cm FL, the Von Bertalanffy growth constant (K) 0.43 year-1, t0 - 0.82 and the Growth Performance Index (f) 4.21. The total mortality coefficient (Z) was 2.59 year-1 , Natural Mortality (M) 0.59 year-1, Fishing Mortality (F) 2.00 year-1 and Exploitation Rate (E) 0.77 year-1. Results show that mortality and exploitation rates were above the optimal, indicating high fishing pressure on coastal yellowfin tuna. The information generated by this study provides some further insights on the scientific knowledge of the coastal yellowfin tuna to inform policy for sustainable management and development of this fishery in Kenya and the entire South West Indian Ocean (SWIO) region.

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Genetic Variation in Yellowfin Tuna Thunnus Albacares (Bonnaterre, 1788) Along Indian Coast Using Pcr-Rflp Analysis of Mitochondrial Dna D-Loop Region

International Journal of Scientific Research ◽

10.15373/22778179/jan2014/8 ◽

2012 ◽

Vol 3 (1) ◽

pp. 25-30

Author(s):

Swaraj Priyaranjan Kunal ◽

◽

Girish Kumar Girish Kumar ◽

Maria Rosalia Menezes

Keyword(s):

Mitochondrial Dna ◽

Genetic Variation ◽

Rflp Analysis ◽

Yellowfin Tuna ◽

Thunnus Albacares ◽

Indian Coast ◽

Loop Region ◽

Pcr Rflp ◽

D Loop

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Ontogenetic change in the amount and position of slow‐oxidative myotomal muscle in relationship to regional endothermy in juvenile yellowfin tuna Thunnus albacares

Journal of Fish Biology ◽

10.1111/jfb.14092 ◽

2019 ◽

Author(s):

Juleen M. Dickson ◽

Kathryn A. Dickson

Keyword(s):

Yellowfin Tuna ◽

Thunnus Albacares ◽

Ontogenetic Change ◽

Myotomal Muscle ◽

Regional Endothermy

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Ontogenetic changes in cutaneous and branchial ionocytes and morphology in yellowfin tuna (Thunnus albacares) larvae

Journal of Comparative Physiology B ◽

10.1007/s00360-018-1187-9 ◽

2018 ◽

Vol 189 (1) ◽

pp. 81-95 ◽

Cited By ~ 5

Author(s):

Garfield T. Kwan ◽

Jeanne B. Wexler ◽

Nicholas C. Wegner ◽

Martin Tresguerres

Keyword(s):

Yellowfin Tuna ◽

Thunnus Albacares ◽

Ontogenetic Changes

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Extraction optimization and properties of collagen from yellowfin tuna (Thunnus albacares) dorsal skin

Food Hydrocolloids ◽

10.1016/j.foodhyd.2007.04.015 ◽

2008 ◽

Vol 22 (5) ◽

pp. 879-887 ◽

Cited By ~ 77

Author(s):

Jin-Wook Woo ◽

Sung-Jae Yu ◽

Seung-Mock Cho ◽

Yang-Bong Lee ◽

Seon-Bong Kim

Keyword(s):

Yellowfin Tuna ◽

Thunnus Albacares ◽

Dorsal Skin ◽

Extraction Optimization

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Exploitation and movements of yellowfin tuna (Thunnus albacares) and bigeye tuna (T. obesus) tagged in the north-western Coral Sea

Marine and Freshwater Research ◽

10.1071/mf97210 ◽

1998 ◽

Vol 49 (6) ◽

pp. 475 ◽

Cited By ~ 18

Author(s):

John Hampton ◽

John Gunn

Keyword(s):

Seasonal Pattern ◽

Yellowfin Tuna ◽

Thunnus Albacares ◽

Bigeye Tuna ◽

Catch Per Unit Effort ◽

The North ◽

Coral Sea ◽

Release Area ◽

Seasonal Signal ◽

North Western

Yellowfin tuna (Thunnus albacares) and bigeye tuna (T. obesus) were tagged and released in the north-western Coral Sea off northern Queensland in 1991 and 1992. Over the next five years, recaptures were reported by Australian longline vessels based in Cairns and fishing in the release area, and by industrial tuna fleets fishing in the adjacent western Pacific region, thus demonstrating clear links between the tuna stocks in these areas. Some southerly movements of yellowfin, in particular, further suggested links with stocks supporting the longline fishery in the south-eastern Australian Fishing Zone. Bigeye tuna tag returns and catch per unit effort by Cairns-based longliners showed a strong seasonal signal, peaking in mid year. Yellowfin tag-return data displayed a similar, but weaker, seasonal pattern. The data were analysed by use of tag-attrition models with seasonally variable catchability and with two assumptions regarding changes in targeting of the two species by longliners during the study. Under both assumptions, the local exploitation rates for yellowfin are low: about 0.07 in 1996. For bigeye, the local exploitation rate in 1996 may have been as high as 0.30, warranting a cautious approach to further fishery expansion in this area.

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