Ecological Studies on the Importan Fishes in the East-Ehina Sea and the Yellow Sea:3, Ecological Studies on a Red Gurnard, Lepidotrigla microptera Günther

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(1) The writer got on board from Feb. 18 to March 9, 1948 and investigated ecologically Red Gurnards in the Yellow Sea. (2) Popularly called Gurnards, Lepidotrigla microptera, form dense schools in the SouthernYellow Sea in winter, and these schools do not migrate to the lower latitude than 32°30'N. (3) Body length composition was in the range of 9.6-29.6cm and the most abandantly capt-ured individuals measured 13.0-27.0cm in length. Average body length of the female was 19.78±3.24cm, and that of the male was 19.78±2.185cm. The male amount to 56.67% of the whole. (4) Relation between body length and weight was represented as follows: w=1.7186L0.250l (5) Relation of weight between body and ovary was represented as follows: EW=0.000006324 BW2701 Average number of incubation was 140, 000, and diameter of ovum was comparatively sm-all being less than 0.8mm. (6) In the fishing season body length was various according to depth. Schools of big gurnards have a tendency to travel in deep water and small ones in shallow. (7) The proper depth for catch was in the range of 65-70m, and the best depth for catch was 69m. And composition of body length of the fish caught in the depth of 65-70m were 20. 10±2.408cm. (8) Quantative variation of catch according to age of the moon was found. (Fig. 7). Kindsand quantity of bait were also changeable. (Fig. 8).
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