- 期刊
- OpenAccess
Maturity and Fecundity of Albacore,Thunnus Alalunga(Bonnaterre),from the Indian Ocean
印度洋長鰭鮪之成熟與孕卵數
摘要
本篇以Larkin之掠食與被捕食者模式，Ursin的生物能量成長模式，Ivlev的攝食方程式和指數型的死亡率所綜合而成之族羣模擬模式來模擬白鮭之生活史和其漁業，同時以此來探究白鮭族羣對漁獲之調適作用。在模擬當中，以包括隨機食物密度，年齡別死亡率，體重別加入量和成熟率及印魚掠食等因素所得之結果最能符合實際的漁業狀況，且其有很强的調適能力。當漁獲死亡率增加時，成熟魚減少，個別魚體餌料量增加，成長加快且較早成熟，而能產出較多的卵而達調適之效。當有印魚掠食時，類似的情形亦可被發現。當漁獲死亡增加時，漁獲量增至某一水準然後上下變動，即使漁獲死亡率達2.0，成魚，親體和補充羣也不會完全消失。
並列摘要
A bioenergetic population model that couples Larkin's predator-prey model,Ursin's bioenergetic growth model,Ivlev's feeding equation,and the exponentialmortality model was used to simulate the lake whitefish fishery and to examinethe population compensation processes.Simulations with random food concentration,age specific mortality,size dependent recruitment and maturity,andsea lamprey predation best described the observed yields and had a largecapacity for compensation.As fishing mortality increased,adult abundancedecreased,food per individuals increased,maturity occurred at an earlier age,and more eggs were produced for compensation.Similar response was foundwhen sea lamprey predation occurred.Yield increased to a certain level andthen fluctuated as fishing mortality increased.Adults,spawners and recruitsnever reached zero even fishing mortality was high.
延伸閱讀
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