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Changes of Digestive Enzyme Activity in Slime Flounder, Micromus achne Larvae with Growth and Development  

박상언 (국립수산과학원 동해연구소 증식과)
임한규 (국립수산과학원 울진수산종묘시험장)
한현섭 (국립수산과학원 서해연구소 증식과)
이종하 (국립수산과학원 울진수산종묘시험장)
임영수 (국립수산과학원 울진수산종묘시험장)
이종관 (국립수산과학원 울진수산종묘시험장)
이상민 (강릉대학교 해양생명공학부)
Publication Information
Journal of Aquaculture / v.16, no.4, 2003 , pp. 233-239 More about this Journal
Abstract
Growth and activities of digestive enzymes in slime flounder (Microstomus achne) larvae were measured from hatching to near the end of larval development (day 58). Larvae reared under starved and fed conditions and the changes of acid phosphatase (ACPase) specific activity, alkaline phosphatase (ALPase) specific activity, trypsin-like enzyme activity and pepsin-like enzyme activity were described with growth and developmental stage of larvae. Total length of the starved larvae was gradually increased for 7 days post hatching and then almost unchanged. Total length of the fed larvae ranged from 5.13$\pm$0.178 mm at the day of hatching to 13.43$\pm$1.395 mm at 58 days after hatching. In starved group, dry body weight decreased from 0.l0$\pm$0.020 mg at the day of hatching to 0.05$\pm$0.012 mg at 12 days after hatching. Dry body weight of fed larvae decreased during the prelarva stage like starved group and then gradually increased. ACPase and ALPase specific activity in the starved larvae increased until all larvae died, however those activities in the fed larvae increased until 20 days and then decreased until 58 days after hatching, with no significant difference between groups. Trypsin-like enzyme activity in the starved larvae was unchanged until 3 days and then was the highest on 5 days after hatching, but not detected after completion of yolksac absorption. Those of fed larvae decreased until 3 days and sharply increased until completion of yolksac absorption. The highest trypsin-like enzyme activity in the fed group was observed at 20 days after hatching. Trypsin-like enzyme activity in the fed larvae was significantly higher than that in the starved larvae from 8 days after hatching. Pepsin-like enzyme activity was increased in 5 days after hatching in both groups. There was significant difference at 8 and 10 days after hatching between both groups. Based on above results, digestive enzyme activities were correspondingly changed to a growth and morphological transformation. Trypsin-like enzyme and pepsin-like enzyme activities are able to be a useful indices for health and growth status in larval slime flounder, because there was significant difference in digestive enzyme activities with developmental stages, growth or feed supply.
Keywords
Slime flounder; Growth; Metamorphosis; ACPase; ALPase; Trypsin-like enzyme; Pepsin-like enzyme;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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