실험실 사육에 의한 한국산 실고기과(Syngnathidae) 2종, 풀해마( Uro campus nanus )와 실고기( Syngnathus schlegeli )의 초기생활사 비교
작성일 : 2020-03-02
작성자 : 김진구
This study provides a detailed morphological description of larvae obtained from Urocampus nanus and Syngnathus schlegeli male brood fish over 20 days of culture in the laboratory. In both species, mating takes place when several males each spread their brood pouch like a wing to attract a female's attention. When the female begins to swim upward, the males follow her and receive her eggs in their brood pouches. Newborn larvae of U. nanus and S. schlegeli had already completed formation of dorsal and caudal fin rays, but not of pectoral fin rays. Pectoral fin rays were completely formed 15 days after release in S. schlegeli and 20 days after release in U. nanus . The ratio of caudal fin length to standard length increased until 8 days and decreased thereafter in S. schlegeli , while in U. nanus this ratio declined continuously after hatching. The larvae of the two species were very similar in external morphology, but well distinguished by the number of dorsal fin rays (15-16 in U. nanus vs. 39-43 in S. schlegeli ), the presence of a membrane under the tail (absent in U. nanus vs. present in S. schlegeli ), and the presence of melanophores in the dorsal fin (present in U. nanus vs. absent in S. schlegeli ). Based on this study, U. nanus appears to be evolutionally more similar to pipefish than to seahorse.
파일 : Syngnathidae.pdf