CAJ | 학술논문

在人工育苗条件下,对四指马鲅Eleutheronema tetradactylum ( Shaw)早期发育的形态及生长特性进行了观察和初步研究。形态发育观察结果表明：四指马鲅初孵仔鱼全长为(1·957依0·055) mm,在培育水温为26℃、盐度为30的条件下,第2天开口,第3天卵黄囊完全被吸收,可开始摄食；初孵仔鱼~13 d为仔鱼期,14~36 d为稚鱼期,之后转为幼鱼期。生长特性分析结果表明：四指马鲅仔鱼期全长、肛前长和体高的生长速度明显快于稚鱼期,全长、肛前长和体高与日龄均呈多项式函数关系( P<0·01)；仔鱼培育过程中,个体生长速度存在明显差异,20日龄仔鱼全长和肛前长的差异较大,其最大值和最小值的比分别是2·437倍和2·004倍。因此,在仔鱼培育生产实践中要注意分池,足量投喂适口饵料,以减少个体间的相互残杀。
재인공육묘조건하,대사지마발Eleutheronema tetradactylum ( Shaw)조기발육적형태급생장특성진행료관찰화초보연구。형태발육관찰결과표명：사지마발초부자어전장위(1·957의0·055) mm,재배육수온위26℃、염도위30적조건하,제2천개구,제3천란황낭완전피흡수,가개시섭식；초부자어~13 d위자어기,14~36 d위치어기,지후전위유어기。생장특성분석결과표명：사지마발자어기전장、항전장화체고적생장속도명현쾌우치어기,전장、항전장화체고여일령균정다항식함수관계( P<0·01)；자어배육과정중,개체생장속도존재명현차이,20일령자어전장화항전장적차이교대,기최대치화최소치적비분별시2·437배화2·004배。인차,재자어배육생산실천중요주의분지,족량투위괄구이료,이감소개체간적상호잔살。
Morphological development and growth characteristics of four-finger threadfin Eleutheronema tetradacty-lum ( Shaw) larvae and juveniles were investigated under artificial hatchery condition. It was found that the newly hatched four-finger threadfin larvae had total length of (1. 957±0. 055)mm, began initial feeding on 2nd day, and showed complete exhausted yolk sac on 3rd day at a salinity of 30 at 26 ℃, when the larvae were fed. The larval stage lasted for 13 days after hatching,and the juvenile stage was kept from 14th day to 36th day when the juveniles developed into young stage. Growth characteristics analysis revealed that there were significantly higher total length, pre-anal length and body height in larval stage than in the juveniles, with very significant polynomial func-tion correlation between day-age and total length, pre-anal length and body height (P<0. 01). Significant differ-ences in individual size were observed during the larva rearing with the differences between the minimum and maxi-mum of 2. 437 times in total length, and 2. 004 times in pre-anal length. Thus it is suggested that enough suitable food be fed during larvae rearing.