Effects of temperature and salinity on the metamorphosis of nauplius of a planktonic shrimp Acetes intermedius Omori, 1975.
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Accession number;02A0246669
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| Title;Effects of temperature and salinity on the metamorphosis of nauplius of a planktonic shrimp Acetes intermedius Omori, 1975. |
| Author;
CHEN Y-H
(National Sun Yat-sen Univ., Kaohsiung, Twn)
CHEN I-M
(National Sun Yat-sen Univ., Kaohsiung, Twn)
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Journal Title;Fish Sci
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Journal Code:L2029A
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ISSN:0919-9268
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VOL.68;NO.1;PAGE.117-122(2002)
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| Figure&Table&Reference;FIG.4, TBL.2, REF.21 |
| Pub. Country;Japan |
| Language;English |
| Abstract;The effects of temperature and salinity on the metamorphosis of nauplii into protozoea I of a planktonic shrimp Acetes intermedius were studied. Eggs or nauplii I, hatched under optimal conditions (30.DEG.C., 30ppt), were incubated under 15 different combinations of three temperatures (20.DEG.C., 25.DEG.C., and 30.DEG.C.) and five salinities (15ppt, 20ppt, 25ppt, 30ppt, and 35ppt) until reaching protozoea I stage. At salinities of 20-35ppt, eggs required 28h, 45h and nearly 4-5 days to develop into protozoea I at 30.DEG.C., 25.DEG.C., and 20.DEG.C., respectively. Nauplii metamorphosed into protozoea I at salinities of 25ppt and 30ppt earlier than at 20ppt and 35ppt at temperatures of 25.DEG.C. and 30.DEG.C., whereas no regularity in time length existed among salinities at 20.DEG.C.. Irrespective of hatching conditions, the rate of metamorphosis reached approximately 90-100% at temperatures of 25.DEG.C. and 30.DEG.C. at salinities of 20-30ppt, but was significantly reduced at 20.DEG.C. for all salinities examined. The metamorphosis rate of nauplii was generally higher at salinities of 20-30ppt at all temperatures. Multiple linear regression analysis revealed that the temperature experienced by nauplii accounted for most of the variation in the metamorphosis rate. (author abst.) |
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