scholarly journals Evaluation of the effects of otolith sampling strategies and ageing error on estimation of the age composition and growth curve for Pacific bluefin tuna Thunnus orientalis

2019 ◽  
Vol 70 (12) ◽  
pp. 1838 ◽  
Author(s):  
Yi-Jay Chang ◽  
Jhen Hsu ◽  
Jen-Chieh Shiao ◽  
Shui-Kai Chang
Keyword(s):  
Growth Curve ◽  
Sampling Methods ◽  
Growth Parameters ◽  
Estimation Error ◽  
Bluefin Tuna ◽  
Fish Stock ◽  
Pacific Bluefin Tuna ◽  
Thunnus Orientalis ◽  
Age Composition ◽  
Lower Estimation

The age composition of the catch and the growth curve of a stock are fundamentally important in fish stock assessment, but these estimates are subject to various sources of uncertainty. Using the Pacific bluefin tuna (Thunnus orientalis) fisheries in the waters off Taiwan as an example, we developed a Monte Carlo simulation model to evaluate the effects of four otolith sampling methods (random otolith sampling, ROS; fixed otolith sampling, FOS; proportional otolith sampling, POS; and reweighting otolith sampling, REW), and ageing error (bias and imprecision) on estimations of age composition and growth curves. The results indicated that FOS has the lowest sampling accuracy, POS performs the best and that ROS is a more efficient method with lower estimation error. For an imprecise reader, the centre (median) of multiple age reads is a useful method to obtain accurate and precise estimates. Ageing bias had greater effects on the estimation of age composition and growth parameters than ageing imprecision or the selection of otolith sampling methods. In most cases, 500 otoliths should be an adequate sample size and could be the guideline for the biological sampling program of the T. orientalis Catch Documentation Scheme.

scholarly journals Estimation of tuna population by the improved analytical pipeline of unique molecular identifier-assisted HaCeD-Seq (haplotype count from eDNA)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kazutoshi Yoshitake ◽  
Atushi Fujiwara ◽  
Aiko Matsuura ◽  
Masashi Sekino ◽  
Motoshige Yasuike ◽  
...  
Keyword(s):  
Resource Depletion ◽  
Bluefin Tuna ◽  
Fish Stock ◽  
Individual Species ◽  
Accurate Estimation ◽  
Pacific Bluefin Tuna ◽  
Thunnus Orientalis ◽  
Detection Range ◽  
D Loop ◽  
Unique Molecular Identifier

AbstractMany studies have investigated the ability to identify species from environmental DNA (eDNA). However, even when individual species are identified, the accurate estimation of their abundances by traditional eDNA analyses has been still difficult. We previously developed a novel analytical method called HaCeD-Seq (Haplotype Count from eDNA), which focuses on the mitochondrial D-loop sequence. The D-loop is a rapidly evolving sequence and has been used to estimate the abundance of eel species in breeding water. In the current study, we have further improved this method by applying unique molecular identifier (UMI) tags, which eliminate the PCR and sequencing errors and extend the detection range by an order of magnitude. Based on this improved HaCeD-Seq pipeline, we computed the abundance of Pacific bluefin tuna (Thunnus orientalis) in aquarium tanks at the Tokyo Sea Life Park (Kasai, Tokyo, Japan). This tuna species is commercially important but is at high risk of resource depletion. With the developed UMI tag method, 90 out of 96 haplotypes (94%) were successfully detected from Pacific bluefin tuna eDNA. By contrast, only 29 out of 96 haplotypes (30%) were detected when UMI tags were not used. Our findings indicate the potential for conducting non-invasive fish stock surveys by sampling eDNA.

Characterization of digestive physiology in Pacific bluefin tuna Thunnus orientalis juveniles fed a raw fish feed and a commercial diet

Aquaculture ◽  
2021 ◽  
pp. 736562
Author(s):  
Koji Murashita ◽  
Hiroshi Hashimoto ◽  
Toshinori Takashi ◽  
Takeshi Eba ◽  
Kazunori Kumon ◽  
...  
Keyword(s):  
Bluefin Tuna ◽  
Fish Feed ◽  
Pacific Bluefin Tuna ◽  
Digestive Physiology ◽  
Thunnus Orientalis ◽  
Commercial Diet ◽  
Raw Fish

Reproductive biology of female Pacific bluefin tuna, Thunnus orientalis, in the Sea of Japan

2016 ◽  
Vol 174 ◽  
pp. 30-39 ◽  
Author(s):  
Yumi Okochi ◽  
Osamu Abe ◽  
Sho Tanaka ◽  
Yukio Ishihara ◽  
Akio Shimizu
Keyword(s):  
Reproductive Biology ◽  
Sea Of Japan ◽  
Bluefin Tuna ◽  
The Sea Of Japan ◽  
Pacific Bluefin Tuna ◽  
Thunnus Orientalis

Identification of male sex-linked DNA sequence of the cultured Pacific bluefin tuna Thunnus orientalis

2014 ◽  
Vol 81 (1) ◽  
pp. 113-121 ◽  
Author(s):  
Yasuo Agawa ◽  
Mayui Iwaki ◽  
Takafumi Komiya ◽  
Tomoki Honryo ◽  
Kouhei Tamura ◽  
...  
Keyword(s):  
Dna Sequence ◽  
Bluefin Tuna ◽  
Pacific Bluefin Tuna ◽  
Thunnus Orientalis ◽  
Male Sex

Energy partitioning in cultured juvenile Pacific bluefin tuna,Thunnus orientalis(Temminck & Schlegel, 1844)

2014 ◽  
Vol 47 (7) ◽  
pp. 2040-2049 ◽  
Author(s):  
Takayuki Ohnishi ◽  
Amal Biswas ◽  
Kohshi Kaminaka ◽  
Takahiro Nakao ◽  
Masashi Nakajima ◽  
...  
Keyword(s):  
Bluefin Tuna ◽  
Energy Partitioning ◽  
Pacific Bluefin Tuna ◽  
Thunnus Orientalis

Distribution, growth and hatch date of juvenile Pacific bluefin tuna Thunnus orientalis in the coastal area of the Sea of Japan

2007 ◽  
Vol 73 (3) ◽  
pp. 534-542 ◽  
Author(s):  
Yosuke TANAKA ◽  
Masahiko MOHRI ◽  
Harumi YAMADA
Keyword(s):  
Sea Of Japan ◽  
Coastal Area ◽  
Bluefin Tuna ◽  
The Sea Of Japan ◽  
Pacific Bluefin Tuna ◽  
Thunnus Orientalis ◽  
Hatch Date

Comparison of the proximate compositions, breaking strength and histological structure by the muscle positions of the full-cycle cultured Pacific bluefin tuna Thunnus orientalis

2005 ◽  
Vol 71 (3) ◽  
pp. 605-611 ◽  
Author(s):  
Yoshi-Nori NAKAMURA ◽  
Masashi ANDO ◽  
Manabu SEOKA ◽  
Ken-Ichi KAWASAKI ◽  
Yasuyuki TSUKAMASA
Keyword(s):  
Breaking Strength ◽  
Bluefin Tuna ◽  
Histological Structure ◽  
Pacific Bluefin Tuna ◽  
Thunnus Orientalis

scholarly journals Combining otolith microstructure and trace elemental analyses to infer the arrival of juvenile Pacific bluefin tuna in the California current ecosystem

2015 ◽  
Vol 72 (7) ◽  
pp. 2128-2138 ◽  
Author(s):  
Hannes Baumann ◽  
R. J. D. Wells ◽  
Jay R. Rooker ◽  
Saijin Zhang ◽  
Zofia Baumann ◽  
...  
Keyword(s):  
Marine Ecosystem ◽  
Fork Length ◽  
California Current ◽  
Bluefin Tuna ◽  
Otolith Microstructure ◽  
Pacific Bluefin Tuna ◽  
Thunnus Orientalis ◽  
Trace Elemental ◽  
Large Marine Ecosystem ◽  
Age Estimates

Abstract Juvenile Pacific bluefin tuna (PBT, Thunnus orientalis) are known to migrate from western Pacific spawning grounds to their eastern Pacific nursery and feeding grounds in the California Current Large Marine Ecosystem (CCLME), but the timing, durations, and fraction of the population that makes these migrations need to be better understood for improved management. To complement recent work focused on stable isotope and radiotracer approaches (“tracer toolbox”; Madigan et al., 2014) we explored the suitability of combining longitudinal analyses of otolith microstructure and trace elemental composition in age ∼1–2 PBT (n = 24, 66–76 cm curved fork length) for inferring the arrival of individuals in the CCLME. Element:Ca ratios in transverse otolith sections (9–12 rows, triplicate ablations from primordium to edge, ø50 μm) were quantified for eight elements: Li, Mg, Mn, Co, Cu, Zn, Sr, and Ba, which was followed by microstructure analysis to provide age estimates corresponding to each ablation spot. Age estimates from otoliths ranged from 328 to 498 d post-hatch. The combined elemental signatures of four elements (Ba, Mg, Co, Cu) showed a significant increase at the otolith edge in approximately half of the individuals (30–60 d before catch). Given the different oceanographic properties of oligotrophic open Pacific vs. high nutrient, upwelling CCLME waters, this signal is consistent with the entry of the fish into the CCLME, which was estimated to occur primarily in July after a transoceanic migration of ∼1.5–2.0 months. Our approach comprises a useful addition to the available tracer toolbox and can provide additional and complementary understanding of trans-Pacific migration patterns in PBT.

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