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The effect of salinity on jungle perch Kuhlia rupestris egg buoyancy and larval hatch rates

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Hutchison, M., Norris, A. and Nixon, D. (2022) The effect of salinity on jungle perch Kuhlia rupestris egg buoyancy and larval hatch rates. Aquaculture Research, 53 (10). pp. 3647-3653. ISSN 1355-557X

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Article Link(s): https://doi.org/10.1111/are.15868

Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/are.15868

Abstract

This paper reports on the first ever observations of jungle perch Kuhlia rupestris egg buoyancy and hatch rates over a range of salinities and represents important information for the husbandry of this species. Dead or unfertilized jungle perch eggs tend to sink in static seawater (>34,000 mg/L), whereas fertilized eggs tend to float. However, at salinities below 32,000 mg/L most fertilized eggs also sink, making it difficult to separate them from unfertilized eggs. Separating fertilized from unfertilized and dead eggs is important for maintaining water quality in aquaculture hatch tanks. Hatch rates of fertilized jungle perch eggs were significantly higher (p < 0.05) at salinities at or above 32,000 mg/L than at lower salinities. The highest mean buoyancy and hatch rates were recorded at 36,000 mg/L. This suggests that jungle perch are fully marine, rather than estuarine spawners. It is recommended that fertilized jungle perch eggs be held at salinities of 32,000 mg/L or higher to maximize hatch rates and to facilitate removal of dead egg material from hatch tanks.

Item Type:Article
Business groups:Animal Science
Additional Information:Open access
Subjects:Aquaculture and Fisheries > Aquaculture > Fish culture > Diseases and adverse factors
Aquaculture and Fisheries > Fisheries > Fishery research
Aquaculture and Fisheries > Fisheries > Fishery for individual species
Deposited On:05 May 2022 02:53
Last Modified:06 Jul 2022 06:32

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