・日本の漁業

Critical Period Hypothesis (Hjort, 1914)

Underlying explanations of recruitment variation among fish stocks have been an issue for several decades. An understanding of biological relationships between larval fish and their zooplankton prey is needed for interpreting recruitment success. Recruitment fluctuations often depend upon events occurring during a critical period between spawning and the time of first feeding by larvae. Conditions affecting these early life stages will also determine the number of individuals that survive in a year class. The timing of spawning can enhance the spatial and temporal affinity between larvae and their food resources.

・マアジの初期減耗過程のモデリング

 　マアジは2~3歳で成熟し、成熟雌魚は１個体あたり，5~50万粒を産卵。

 　主産卵期は2月～５月。

 　多獲性浮魚類の代表。TAC対象魚種。

     →大きな初期減耗　Hjort (1914)の仮説

・稚魚分布との比較

・90日後の粒子位置と生残量

研究紹介：環境DNAを用いた海洋生物多様性の評価と水産生物の資源量把握