瀬戸内海中部海域におけるサワラ卵・仔魚の鉛直・水平分布

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  • Vertical and horizontal distribution of eggs and larvae of Japanese Spanish mackerel in the central waters of the Seto Inland Sea.
  • セトナイカイ チュウブ カイイキ ニ オケル サワラ ラン シギョ ノ エンチ

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Vertical and horizontal distribution of eggs and larvae of Japanese Spanish mackerel Scomberomorus niphonius was investigated during May and July from 1981 to 1983 in the central waters of the Seto Inland Sea.<br> At stations where seawater-density stratification was conspicuous, more than half of the eggs (excluding those at early and late stages of development) concentrated to the surface layer, while larvae occurred in the middle layer (during daytime). In less stratified area, eggs and larvae were more dispersed.<br> Seasonal shift was observed in their geographical distributions. In May, the early spawning season, eggs occurred mainly in Hiuchi-nada where the seawater was stratified and the surface temperature was the highest in the area investigated. In June and July, however, eggs were abundant in other areas where the water temperatures were comparatively low. Larvae showed similar distribution pattern with that of eggs.<br> The spawning of this fish in this area seems to be governed by the water temperature, especially at the surface where the seawater is stratified. The surface water temperature where eggs occurred ranged from 14.6 to 22.7°C.

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