Effects of age composition of Pacific bluefin tuna on their spatiotemporal distribution of active breeding in the south-western North Pacific and on its recruitment strength
Taiki Ishihara
A * , Tamaki Shimose B and Yuki Uematsu A
+ Author Affiliations
- Author Affiliations
A Tuna Biology Group, Highly Migratory Resources Division, Fisheries Stock Assessment Center, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, 5-7-1 Orido, Shimizu-ku, Shizuoka City, Shizuoka 424-8633, Japan.
B Demersal Fish Resources Division, Fisheries Stock Assessment Center, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, 1551-8 Taira-machi, Nagasaki City, Nagasaki 851-2213, Japan.
Marine and Freshwater Research 73(11) 1339-1351 https://doi.org/10.1071/MF22012
Submitted: 13 January 2022 Accepted: 8 August 2022 Published: 8 September 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: The south-western North Pacific is one of the main spawning grounds of the Pacific bluefin tuna (Thunnus orientalis) and is targeted by Japanese longline fisheries.
Aims: This study evaluated the influence of age composition of spawning groups in this area on the strength of recruitment through the spatiotemporal distribution of active breeding.
Methods: The variation in the recent year-class strength in the area was estimated on the basis of the otolith age estimation and catch data from 2007 to 2016.
Key results: In the age–frequency distribution, 9 years was the most frequent age class. The instantaneous total mortality after 9 years of age was 0.32.
Conclusions: On the basis of catch locations and age estimation results, the bias toward young individuals influenced the spatiotemporal pattern of active breeding to shifts to higher latitudes and earlier breeding. In this area, the abundance of the main spawning group (9- and 10-year-old fish) may affect the recruitment of 0-year-old fish, and the older fish are considered to serve as a ‘seed bank’.
Implications: These results are expected to contribute to the development of appropriate management strategies for spawning stocks in the area and demonstrate the magnitude of the influence of age composition on population fluctuations.
Keywords: catch curve, cohort analysis, demography, longline fisheries, otolith, spawning migration, spawning stock, Thunnus orientalis.
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