Spatiotemporal variations and influential factors affecting reproductive dynamics of Pacific saury in the Northwest Pacific during fishing season
Wei‐Che Hung, Jhen Hsu, Yi‐Jay Chang, Wen‐Bin Huang, Chih‐Hao Hsieh, Ming‐Tsung Chung- Aquatic Science
- Ecology, Evolution, Behavior and Systematics
Abstract
This study examined the spatial and monthly variations in reproductive dynamics of Pacific saury collected in the high sea (40°N ‐ 49°N, 149°E ‐ 168°E) of the northwestern Pacific during the fishing season of the Taiwanese stick‐held dip net fisheries (July ‐ November) from 2018 ‐ 2019. Generalized additive mixed‐effects models (GAMMs) were applied to explore the relationship between the probability of maturing and spawning occurrence (PMOS) and the explanatory variables (month, body length, sea surface temperature as fixed effects and fishing set as random effect) for the age‐0 and age‐1 fish, respectively. In addition, the impact of the geographical difference in growth rates of age‐0 fish, quantified as the radius of the otolith annual ring, on the PMOS of age‐1 fish was also explored in the GAMMs. Results showed that the mean values of the condition factor (CF) varied by months and higher mean CFs were observed in north of 45°N. However, the mean values of the gonadosomatic index did not show a clear spatiotemporal pattern. The spatial distribution of the ovarian maturation states revealed that the spawning ground of Pacific saury during July ‐ November was broader than that previously known and had partly overlapped with the high sea fishing ground. The best GAMM showed that the predicted PMOS of the age‐0 fish were generally low (mean = 19%; SD = 10%) and tended to increase with increasing body length. In contrast, the predicted PMOS were relatively higher (mean = 37%; SD = 10%) for the age‐1 fish, and increased with increasing SST and decreasing latitude. Two candidate GAMMs, which are equally supported as the best model (ΔAIC < 2), provide evidence that a higher growth rate of age‐0 fish may result in higher reproductive activity in age‐1 fish. This is one of few studies focusing on the reproductive dynamics of Pacific saury during the fishing season, current limitations, future directions and conservation implications were discussed.
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