Interregional differences in mortality of aquacult

Authors: Kazuhiro Aoki Goh Onitsuka Manabu Shimizu Hiroshi Kuroda Hitoshi Matsuo Yuuki Kitadai

Publish Date: 2015/04/19

Volume: 81, Issue: 3, Pages: 525-532

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Abstract

Mass mortality of Seriola quinqueradiata was caused by a Chattonella bloom in summer 2010 in the southern area of the Yatsushiro Sea We analyzed the diurnal records of the mortality occurrence and cell density of C marina to examine the shortterm mortality dynamics In addition a hydrodynamic model and Lagrangian particle tracking method were used to examine interregional differences in the mortalities Mortalities were concentrated along the southern coast of Shishi Island and western coast of Nagashima Island in early July In late July mortalities occurred along the southern coast of Shishi Island and eastern coast of Nagashima Island Severe mortalities occurred where the bloom 100 cells ml−1 of Chattonella marina appeared in both early and late July Model results show that interregional difference of the bloom was controlled by the advection system in the Yatsushiro Sea The consistent spatiotemporal pattern between fish mortalities and bloom dynamics indicates the potential benefits of realtime monitoring of harmful algae and assessing factors controlling hydrographic conditions to mitigate mortalitiesThe authors thank two anonymous reviewers for their useful comments on the manuscript This study was partly supported by grants from Fisheries Research Agency We used the supercomputer of Agriculture Forestry and Fisheries Research Information Technology Center Japan

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