Feeding habit of bluefin tuna Tunnus thynnus larvae in the western North Pacific Ocean.
Open accessAbstract
This study examined the gut contents of 1,939 larvae (2.28-14.60mm in total length) of bluefin tuna Thunnus thynnus collected in 1981 and 1982 by larva-net tows in the waters around Nansei Islands, and described their feeding condition and morphological development.The larvae fed on small zooplankton, mainly copepods, in the daytime: those less than 5mm TL on copepoda nauplii of less than 0.3mm in body length, and those larger than 5mm TL on larger copepods, especially of genus Corycaeus.This significant improvement of feeding ability at 5mm TL was also recognized both from examination of empty stomach rate and wet weight of gut content.The analysis of relative growth of the larvae showed that their external shape became constant at about 5mm TL.These results suggest that the larvae larger than 5mm TL fed more efficiently than smaller ones, getting higher chance of survival.
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Larval BFT appear likely to feed on copepods, copepod nauplii, cladocerans and appendicularians at preflexion stages, before becoming more piscivorous postflexion.
“Studies concerning the diets of larval BFT are rare, but they appear likely to feed on copepods, copepod nauplii, cladocerans and appendicularians at preflexion stages, before becoming more piscivorous postflexion (Uotani et al. 1990, Llopiz et al. 2010, Catalán et al. 2011, Reglero et al. 2011).”
From Comparison between environmental characteristics of larval bluefin tuna Thunnus thynnus habitat in the Gulf of Mexico and western Mediterranean Sea (2013) · cites this paper as Uotani et al. 1990
The paper’s Abstract reports that smaller bluefin tuna larvae feed mainly on copepod nauplii. It says larvae larger than 5 mm feed mainly on larger copepods, especially Corycaeus, rather than documenting a shift to fish prey. The passages do not establish preflexion feeding on cladocerans or appendicularians. (LLM, conf=0.88)
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Life History and Stock Structure of Atlantic Bluefin Tuna (<i>Thunnus thynnus</i>)
Rooker, J. R., Alvarado Bremer, J. R., Block, B. A., Dewar, H., de Metrio, G., Corriero, A., Kraus, R. T., Prince, E. D., Rodríguez-Marín, E., & Secor, D. H. (2007) · Reviews in Fisheries Science · doi:10.1080/10641260701484135 · Cited by 239 · see citing works
Reproduction and larval biology in tunas, and the importance of restricted area spawning grounds
Muhling, B. A., Lamkin, J. T., Alemany, F., García, A., Farley, J., Ingram, G. W., Berastegui, D. A., Reglero, P., & Carrion, R. L. (2017) · Reviews in Fish Biology and Fisheries · doi:10.1007/s11160-017-9471-4 · Cited by 82 · see citing works
Muhling, B., Reglero, P., Ciannelli, L., Alvarez-Berastegui, D., Alemany, F., Lamkin, J., & Roffer, M. (2013) · Marine Ecology Progress Series · doi:10.3354/meps10397 · Cited by 58 · see citing works
Llopiz, J. K., & Hobday, A. J. (2015) · Deep Sea Research Part II: Topical Studies in Oceanography · doi:10.1016/j.dsr2.2014.05.014 · Cited by 47 · see citing works
Cannibalism among size classes of larvae may be a substantial mortality component in tuna
Reglero, P., Urtizberea, A., Torres, A., Alemany, F., & Fiksen, Ÿ. (2011) · Marine Ecology Progress Series · doi:10.3354/meps09187 · Cited by 47 · see citing works
- Authors
- Uotani, I., Saito, T., Hiranuma, K., & Nishikawa, Y.
- Affiliations
- Tokai University (JP)
- Venue
- NIPPON SUISAN GAKKAISHI
- Published
- 1990
- Volume
- 56
- Issue
- 5
- Pages
- 713-717
- ISSN
- 0021-5392 (ISSN-L)
- 1349-998X
- OpenAlex
- W2015121128
- Cited by
- 69
- References
- 0
- Citations by year
- 2026: 3 · 2025: 1 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 3 · 2018: 2 · 2017: 8 · 2016: 3 · 2015: 3 · 2014: 5 · 2013: 2 · 2012: 2
- FWCI
- 1.48
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- NIPPON SUISAN GAKKAISHI (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Fish Biology and Ecology Studies
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Aquaculture Nutrition and Growth
- Keywords
- bluefin tuna, Thunnus thynnus, larval feeding, gut contents, copepods, zooplankton, larval development, larval morphology, larval survival, Ryukyu Islands, western North Pacific
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