Relationship between anchovy (Engraulis japonicus) larval recruitment in Ise Bay and the western Enshu-Nada, and reproduction of sardine (Sardinops melanostictus) along the Pacific Coast of Japan
2005
Nakamura, M.(Aichi-ken. Fisheries Research Inst., Gamagori (Japan)) | Uchiyama, M. | Funakoshi, S.
We studied the relationship between anchovy (Engraulis japonicus) larval recruitment in Ise Bay and the western Enshu-Nada, and reproduction of sardine (Sardinops melanostictus) along the Pacific coast of Japan using fishery catch and egg abundance data. The anchovy larvae catch in spring increased as the stock size for immature sardine decreased. Conversely, the anchovy larvae catch in autumn increased, when the stock size for immature sardine in the following year increased, Using spawner-recruit models, we calculated the index of the environmental conditions which affect anchovy larval recruitment and the index of the environmental conditions which affect sardine reproduction, In the results, a positive correlation was found for the relationship between the environmental condition index for anchovy larval recruitment in autumn and that for sardine reproduction in the following year (n=27, r=0.581, p0.01). This fact shows that the conditions in the sardine spawning and larval nursery grounds off the south coast of Japan affect not only sardine reproduction but also anchovy reproduction in autumn.
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