Lipid Condition and Survival in Shrimp (Pandalus borealis) Larvae
Croups of shrimp (Pandalus borealis) larvae were reared under different food concentrations and types to assess changes in condition and survival during development. As expected, rate of growth (wet weight) was highei for larvae fed on 300 Artemia nauplii.L r (San Francisco strain: 0.0528 mg'd...
| Main Authors: | , , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.320.2994 http://www.phys.ocean.dal.ca/~taggart/Publications/Ouellet-Taggart-Frank_CJFAS49_1992.PDF |
| Summary: | Croups of shrimp (Pandalus borealis) larvae were reared under different food concentrations and types to assess changes in condition and survival during development. As expected, rate of growth (wet weight) was highei for larvae fed on 300 Artemia nauplii.L r (San Francisco strain: 0.0528 mg'd '; Canada strain: 0.0355 mg'd ') compared with those reared at 150 nauplii'L ' (San Francisco strain: 0.0211 mg'd '), larvaefed /sochrysis cells only, and no food. Shrimp larvae reared without food and larvae fed on /sochrysis cells showed a decreasing trend in wet weight during development and did not survive beyond stage ll. The triacylglycerol (TAC) content of larvae accumulated rapidly during the initial phase of intermoult followed by a decline to a minimum coincident with ecdysis. High mortality (average 2.2'/.'d ') occurred during the first phases of development (first 25 d) for all rations. Differences among experiments in the magnitude of the mortality (from 0.86 to 4.66%'d r) at the first moult were related to the proportion of larvae in poor TAC condition. The results are consistent with the concept that the TAC condition index can be used to forecast, on a relative basis, differential survival among larval groups. Des groupes de larves de crevette (Pandalus borealis \ ont 6t6 gard6s sous diff6rent types et concentrations de nourriture, afin d'6tudier l'6volution de la condition et de la survie au cours du d6veloppement. Des diff6rences dans la croissance des larves ont 6t6 observ6es tel que pr6vues) partir des diff6rences de qualit6 des dibtes. Les |
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