Bulletin of the Hiroshima University Museum Issue 11
2019-12-25 発行

広島湾におけるクロダイ稚魚の出現状況と年変動

Horizontal distribution and annual fluctuations in abundance of settled juveniles of the black sea bream Acanthopagrus schlegelii in Hiroshima Bay, Japan
Kawai, Kentaro
Fujita, Hiroki
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abstract
To obtain basic information on the optimal nursery grounds for black sea bream Acanthopagrus schlegelii recruits, juvenile density in Hiroshima Bay was calculated. Juveniles (n=2,488) were collected from 18 sampling stations around Hiroshima Bay using surf zone nets during the early summer from 2006 to 2009. to assess the annual fluctuations of juvenile density, samples were continuously caught from one station (St. 1) on the western side of Noumishima Island from 2013 to 2016. Relatively high densities were recorded from four stations (St. 1, 2, 6 and 10) located along the Ohno Seto Strait and the western side of Noumishima Island. These sampling stations shared three common characteristics that likely explain the observed higher juvenile density, namely (1) moderate currents with calm areas protected by physical barrier, (2) sandy muddy beaches (tidal flats) and (3) freshwater inflows or run-off. Juvenile density showed an annual decreasing trend, suggesting that fish stock levels of black sea bream are declining in Hiroshima Bay.
subject
クロダイ
砂浜海岸
稚魚
広島湾
black sea bream
Hiroshima Bay
juvenile
sandy beach
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