Factors that determine the quality of bigeye tuna, caught in the western tropical Atlantic Ocean

Nóbrega, Camila Costa da; Mendes, P.P.; Mendes, Emiko Shinozaki

doi:10.1590/1678-41627093

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…Findings on variables that significantly affect catch rates might identify gear technology methods that would increase gear selectivity to reduce unwanted bycatch while maintaining economically viable catch rates of market species (Gilman, ; Gilman et al ., ). Findings on variables that significantly affect haulback survival could identify opportunities to increase the probability of survival of organisms that escape from the gear before retrieval, and organisms that are caught and released (Broadhurst et al ., ; Afonso et al ., ; Curran and Beverly, ; Gilman et al ., ), as well as augment the quality of retained market species (Cramer et al ., ; Nobrega et al ., ). The study estimated changes in shark fishing mortality that have occurred since a 2003 ban on retaining sharks, including their fins, and the use of wire leaders.…”

Section: Introductionmentioning

confidence: 97%

Standardized catch and survival rates, and effect of a ban on shark retention, Palau pelagic longline fishery

Gilman

Chaloupka

Merrifield³

et al. 2015

Aquatic Conservation

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1. Pelagic longline fisheries affect both market and vulnerable bycatch species and can have broad effects on community structure and processes.2. Observer data from the Palau longline fishery were analysed to identify opportunities to mitigate vulnerable species bycatch, determine temporal trends in local abundance, and assess changes following a ban on shark retention and wire leaders. Catch and haulback condition data for bigeye and yellowfin tunas, blue and silky sharks and pelagic stingrays were fitted to standardized catch and survival rate models.3. The fishery caught silky and blue sharks, olive ridley sea turtles and other species of conservation concern. 4. Changing from shallow sets to deep daytime sets might reduce shark and sea turtle catch rates but increase turtle haulback mortality rates, maintain economically viable tuna catch rates, but increase catch rates of pelagic stingrays, a lower conservation concern than main caught species of sharks and turtles. 5. Focusing fishing effort during the middle of the calendar year would maximize yellowfin tuna and minimize silky shark standardized catch rates, but maximize blue shark catch rates. 6. A large decline in shark fishing mortality rate very likely occurred following a ban on shark retention and wire leaders. This was due to large reductions in the nominal shark catch rate and shark retention, partially offset by decreases in the shark haulback survival rate and pre-catch survival rate. Significantly higher blue shark and lower pelagic stingray nominal catch rates occurred on wire vs. monofilament leaders. Significantly higher blue shark and lower yellowfin tuna nominal catch rates occurred on sets using shallow 'shark lines'. It is a research priority to compare the probability of shark pre-catch survival after escaping from monofilament leaders with an ingested hook and trailing line to the survival probability when captured on wire leaders.

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Section: Introductionmentioning

confidence: 97%

Standardized catch and survival rates, and effect of a ban on shark retention, Palau pelagic longline fishery

Gilman

Chaloupka

Merrifield³

et al. 2015

Aquatic Conservation

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“…Já em relação aos elasmobrânquios, MARÍN et al (1998) e MEGALOFONOU (2005 relatam que o P. glauca ocorre com muita frequência na fauna acompanhante da pesca de espinhel-desuperfície mas possui baixo valor comercial, sendo apenas as nadadeiras um produto valioso (CLARKE et al, 2006;ROSE, 1998 O procedimento de marcação dos peixes com fitas coloridas para indicar o dia da captura, utilizado pela frota espinheleira do Rio Grande do Norte (NÓBREGA et al, 2014), assim como informações de pesos individuais dos espécimes, obtidas no desembarque, dados de localização e informações ambientais, podem subsidiar a produção de informações técnico-científicas e contribuir para a gestão pesqueira, além de possibilitar o deslocamento da frota para as áreas de ocorrência dos maiores indivíduos, minimizando a captura de imaturos.…”

Section: Emprego Renda E Custos Operacionaisunclassified

Caracterização da pescaria industrial de espinhel-de-superfície no Rio Grande do Norte

Lira

Nóbrega²,

Oiveira³

2017

Bol. Inst. Pesca

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RESUMORio Grande do Norte (RN) was the main Brazilian exporter of tunas and other species of fish during the period from 2006 to 2016, generating food, employment and income, due to its proximity to the migratory routes these fishes. In the attempt to better understand the dynamic and the composition of the fleet's captures, that operates with pelagic longline in the Southwestern Equatorial Atlantic and based in RN, their landings data, were analyzed between 2006 and 2014. Nearly 80% of the catch by weight was composed of only four species, being 34,1% Thunnus albacares, 30,8% Xiphias gladius, 8,8% Prionace glauca and 6,8% Thunnus obesus. The expenses with crew, fuel, bait and fishing gear represented 65% of the total. Of the total exported by Brazil, the RN was responsible for exporting approximately 77% fresh and 26% frozen of T. albacares, 92% fresh and 90% frozen of T. obesus, and 55% fresh and 95% frozen of X. gladius. This study provided information that should be taken into account for the sustainability of tuna fishing caught by the Potiguar fleet.Key words: fishing; tunas; CPUE; export; costs. RESUMOO Rio Grande do Norte (RN) foi o principal exportador brasileiro de atuns e afins durante o período de 2006 a 2016, gerando alimento, emprego e renda, haja vista a sua proximidade com as rotas migratórias desses peixes. Visando a um melhor entendimento da dinâmica e composição das capturas da frota sediada no RN e que opera com espinhel pelágico no Atlântico Sudoeste Equatorial, também foram analisados dados de desembarques entre 2006 e 2014. Cerca de 80% das capturas em peso foram apenas de quatro espécies, sendo 34,1% Thunnus albacares; 30,8% Xiphias gladius; 8,8% Prionace glauca e 6,8% Thunnus obesus. A remuneração da tripulação, combustível, isca e material de pesca representaram 65% dos custos de produção. Do total exportado pelo Brasil, em peso, o RN foi responsável por aproximadamente 77% de T. albacares fresco e 26% congelado, 92% de T. obesus fresco e 90% congelado e 55% de X. gladius fresco e 95% congelado. Este estudo produziu informações que devem ser levadas em consideração para a sustentabilidade da atividade de pesca de atuns e afins pela frota Potiguar.

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“…Selain itu, kandungan lemak juga dipengaruhi oleh ukuran ikan, kebiasaan makan serta kondisi perairan di daerah penangkapan (Syarif et al, 2012). Tuna berukuran besar dengan berat di atas 90 kg mempunyai kandungan lemak yang cukup tinggi (Nurbrega, Mendes & Mendes, 2014). Dalam penelitian ini berat tuna loin yang digunakan berkisar antara 14,1-16,1 kg/loin, atau setara dengan berat tuna yang berkisar 60-65 kg dan tergolong ukuran sedang.…”

Section: Komposisi Proksimat Tuna Loinunclassified

Evaluasi Mutu Tuna Loin Segar untuk Sashimi yang Diolah di atas Perahu Selama Penanganan dan Distribusinya Di Ambon

Suryaningrum¹,

Ikasari

Octavini

2017

JPBKP

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ABSTRAKPenelitian ini bertujuan untuk mengevaluasi mutu tuna loin segar untuk sashimi yang diolah di atas perahu oleh nelayan skala kecil di kota Ambon. Pengamatan dilakukan terhadap mutu tuna loin segar saat didaratkan, dikemas dan ketika tiba di tempat pengiriman, yang meliputi suhu pusat, pH, TVB, Angka Lempeng Total (ALT), serta sifat sensorinya. Pengamatan juga dilakukan terhadap kondisi sanitasi, sarana dan prasarana yang digunakan dengan menggunakan metode swab terhadap cemaran mikroba yang meliputi ALT, E. coli dan Salmonella. Pada tahap akhir dilakukan evaluasi implementasi Good Manufacturing Practice (GMP) dengan menilai sarana dan prasarana berdasarkan persyaratan teknik dalam KEPMEN No. 52A/KEPMEN/ 2013. Hasil penelitian menunjukkan suhu pusat loin berkisar antara 10, 58 -16,53 o C, jauh di atas suhu untuk tuna sashimi yaitu maksimal 4,4 o C. Kandungan TVB tuna loin yang didaratkan berkisar antara 13,6-14,04 mgN%, yang mengindikasikan bahwa tuna loin tergolong segar. Secara sensori, panelis mengidentifikasi adanya lapisan pelangi tipis pada permukaan loin segar yang menunjukkan ikan mengalami stres sebelum dimatikan. Pengiriman loin segar keluar kota Ambon berpengaruh terhadap penurunan mutu sensori serta peningkatan jumlah ALT. Tuna loin yang didaratkan di pos pendaratan terlebih dahulu menyebabkan terjadinya penurunan nilai sensori dan peningkatan jumlah ALT yang lebih cepat, namun demikian tuna loin masih tetap tergolong segar ketika sampai di tempat pengiriman. Hasil swab pada kapal, miniplant dan es yang digunakan menunjukkan jumlah bakteri berkisar antara 10 5 -10 6 koloni/g, mengindikasikan kondisi sanitasi yang kurang terjaga. Hasil evaluasi terhadap implementasi GMP pada miniplant yang digunakan menunjukkan hanya 59% kriteria memenuhi persyaratan yang ditetapkan.

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Factors that determine the quality of bigeye tuna, caught in the western tropical Atlantic Ocean

Cited by 4 publications

References 12 publications

Standardized catch and survival rates, and effect of a ban on shark retention, Palau pelagic longline fishery

Standardized catch and survival rates, and effect of a ban on shark retention, Palau pelagic longline fishery

Caracterização da pescaria industrial de espinhel-de-superfície no Rio Grande do Norte

Evaluasi Mutu Tuna Loin Segar untuk Sashimi yang Diolah di atas Perahu Selama Penanganan dan Distribusinya Di Ambon

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Factors that determine the quality of bigeye tuna, caught in the western tropical Atlantic Ocean

Cited by 4 publications

References 12 publications

Standardized catch and survival rates, and effect of a ban on shark retention, Palau pelagic longline fishery

Standardized catch and survival rates, and effect of a ban on shark retention, Palau pelagic longline fishery

Caracterização da pescaria industrial de espinhel-de-superfí­­cie no Rio Grande do Norte

Evaluasi Mutu Tuna Loin Segar untuk Sashimi yang Diolah di atas Perahu Selama Penanganan dan Distribusinya Di Ambon

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Caracterização da pescaria industrial de espinhel-de-superfície no Rio Grande do Norte