蘇楠傑 博士 與 孫志陸 老師
我們的研究主要在瞭解大型遠洋洄游魚類時空分布與海洋環境之間的關係，並在漁業資源評估模式中考慮時空分布變動，以解決無法估計族群季節性洄游的問題，並提高漁業管理參數在估計上的準確性。例如我們發現黑皮旗魚資源分布會隨著海表層水溫(SST)而有季節性的變動，因此必須建構黑皮旗魚空間性別年齡結構資源評估模式以套適族群空間分布資訊，並評估季節性洄游可能造成的影響。我們發現資源評估結果會因為自然死亡率與加入量-親魚量關係式曲度設定值的不同而產生差異，目前產卵親魚量對未開發產卵親魚量之比值，則為管理參數中最為穩健之估計量。研究結果建議太平洋黑皮旗魚資源評估模式必須考慮季節性洄游與性別結構所造成的影響，以降低參數估計之不確定性並能改善資源評估結果的準確性。
References:
Su, N. J.; Sun, C. L.*; Punt, A. E.; Yeh, S. Z.; DiNardo, G., 2011. Modelling the impacts of environmental variation on the distribution of blue marlin, Makaira nigricans, in the Pacific Ocean, ICES Journal of Marine Science, 68(6), 1072-1080.
Su, N. J.; Sun, C. L.*; Punt, A. E.; Yeh, S. Z.; Dinardo, G., 2011. Evaluation of a spatially sex-specific assessment method incorporating a habitat preference model for blue marlin (Makaira nigricans) in the Pacific Ocean, Fisheries Oceanography, 20(5), 415-433.
Our research focuses on the relationship between marine environment and spatio-temporal patterns of large pelagic migratory species, and also develops fishery stock assessment models that incorporate the relationship and seasonal migration pattern of the population, which could improve the reliability of fishery management-related parameters. For example, spatial distributions of blue marlin relative density indicate that there is seasonal variation in the distribution of blue marlin, which appears to be related to shifts in sea surface temperature (SST). We therefore construct a spatially sex-specific age-structured stock assessment model fitted to the information on the relative density of the population over space to evaluate the possible impacts of seasonal movement. We found that the outcomes of the assessment are sensitive to the values assumed for natural mortality and stock-recruitment steepness and the ratio of current spawning stock biomass to that at pre-exploitation equilibrium appears to be the most robust among the quantities considered. Results suggest that assessment methods for blue marlin in the Pacific Ocean need to take account of seasonal migration and sex structure to improve stock assessments.
References:
Su, N. J.; Sun, C. L.*; Punt, A. E.; Yeh, S. Z.; DiNardo, G., 2011. Modelling the impacts of environmental variation on the distribution of blue marlin, Makaira nigricans, in the Pacific Ocean, ICES Journal of Marine Science, 68(6), 1072-1080.
Su, N. J.; Sun, C. L.*; Punt, A. E.; Yeh, S. Z.; Dinardo, G., 2011. Evaluation of a spatially sex-specific assessment method incorporating a habitat preference model for blue marlin (Makaira nigricans) in the Pacific Ocean, Fisheries Oceanography, 20(5), 415-433.
