コノシロClupanodon punctatus (T_EMMINCK & S_CHLEGEL) のシラス期に就て

抄録

The smallest post-larva of the present species which the author could obtain is 5mm in total length. This early post-larva represents the so-called “white fish” stage, a form charac-teristic to the clupeoid post-larva with transparent, elongated body. There are about 51 myo-tomes in the body, and the anus lies under the 45th myotome. The characteristic arrangement of the black pigments along the upper and lower sides (sometimes only on the upper side) of the body near the tip of the notochord, and the far backward situation of the anus are the characteristics by which the early post-larva of the present species is distinguished from those of the related species found in Korean district. The early post-larvae of about 5-9mm in total length were captured by surface tow in May to July, in the eastern part of the Korean Strait and along the south and west coasts of Korean Peninsula. During growth, the anus and the dorsal fin of this “white fish” shift forward, but the ventral fin scarcely changes its initial situation. The body gradually increases in height and becomes compressed. At a length of about 35mm, the surface of the body becomes wholly scaled, the relative position of the fin and the anus settled, and the post-larval “white fish” stage is passe ?? over. Then after-wards, a black spot appears in the shoulder region, the hinder-most ray of the dorsal fin Legins to stretch out, and the snout covers the lower jaw, and the general appeara ?? ce of the body approaches that of the adult form.