Features and cohort analysis of brown sole Pleuronectes herzensteini population in northern Hokkaido, Japan
2006
Shimoda, K.(Hokkaido. Fish Hatchery, Eniwa (Japan)) | Itaya, K. | Murooka, M. | Hoshino, N.
To reconsider the area of stock assessment of brown sole Pleuronectes herzensteini stock from the Sea of Okhotsk to Ishikari Bay, components of commercial landings, an abundance index of juvenile fish and relationships of catch between districts were examined. Positive correlation was observed in the annual catch fluctuation between the present stock assessment area and the Tomamae district. Age structures and an occurrence pattern of abundant year class of commercial landings show a geocline from the Sea of Okhotsk to Ishikari Bay. Positive correlation was observed between the abundance index of age one fish in the Ishikari Bay and that of the Sea of Okhotsk. Based on these results and previous mark-recapture studies, we concluded that the brown sole stock from the Sea of Okhotsk to Ishikari Bay is composed of one population. Results of cohort analysis indicate that population size of brown sole stock from the Sea of Okhotsk to Ishikari Bay is influenced by recruitment of dominant year class.
显示更多 [+] 显示较少 [-]