洲本附近の魚獲カタクチイワシに就て
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概要
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Engraulis japonicus J. & S. in a fish of commercially important and is caught abundantly in the coast of Sumoto City of Osaka Bay. Here the author studied on the habit of this fish investigating the catches in Beach seine, Purse seine and Komase-net. Results are summerized as follows; 1) The difference of body length-compositions between catches in Jibiki and Kinchaku-net shows that the migration of the juvenile fish (5cm >) and the Young (5-8.5cm) ts in the surface region forming a large group and the former is in the coast, the latter is in the off-shore, But the adults (8.5cm <) swimm in the deep. 2) The relation between the body length (L) and its weight (W) is represented by the formula W=0.00358 L3.208. 3) The sex-ratio is about 47% male; 53% female. 4) Though there is a large deviation the number of eggs in ovary is 4800 in mean.