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The effect of temperature on survival, growth, feeding and metabolic activity of the southern rock lobster, Jasus edwardsii
journal contribution
posted on 2023-05-16, 12:30 authored by Craig ThomasCraig Thomas, Crear, BJ, Hart, PRThis study investigated the effect of temperature (18, 20, 22 and 24°C) on growth, feeding and metabolism of post-puerulus lobsters as part of a larger study of the culture potential of farming the southern rock lobster, Jasus edwardsii. There was no significant difference (P > 0.05) in the specific growth rates (SGR) at 18, 20 or 22°C; however growth decreased significantly (P < 0.05) at 24°C. The growth response was described by a quadratic regression (SGR= -0.031T2+ 1.261T - 10.884, r2 = 0.77), which predicted the optimum temperature for growth to be 20.6°C. Lobsters held at 22°C had smaller intermoult periods than lobsters at 18°C; however, a decreased moult increment at 22°C meant that growth rate did not increase at that temperature. The decreased growth at 24°C compared to 22°C was evidenced by a longer intermoult period. Temperature affected survival of lobsters, with survival at 24°C being significantly lower (P < 0.05) than at 18°C. There were no significant differences (P > 0.05) in survival at 18, 20 or 22°C. The response of feed conversion ratio (FCR) to temperature was described by a quadratic regression (FCR=.0.011T2 - 0.434T ± 5.231, r2= 0.995), which suggested that the optimum temperature for feed conversion was 19.3°C. Oxygen consumption rates (M(O)2) increased with increasing temperatures between 18°C and 22°C and declined at 24°C; whilst total ammonia nitrogen (TAN) excretion increased with increasing temperature. The relationships were described by regression equations: M(O)2 = -0.044T2 ± 1.91T - 18.553 (r2 = 1.0); TAN = 0.127T - 1.174 (r2 = 0.91). A temperature of 24°C appears to be above the upper thermal tolerance of juvenile J. edwardsii. Lobsters held at this temperature showed reduced survival (compared to those at 18°C), reduced growth (compared to those at 22°C) and appeared to be suffering from respiratory stress (moult-related mortalities, low Q10 between 22°C and 24°C). Overall, the results indicate that juvenile J. edwardsii can be cultured at 22°C without adversely affecting their growth, survival or feed efficiency with optimal temperature range between 19 and 21°C. (C) 2000 Elsevier Science B.V.
History
Publication title
AquacultureVolume
185Pagination
73-84ISSN
0044-8486Department/School
Institute for Marine and Antarctic StudiesPublisher
ElsevierPlace of publication
NetherlandsRepository Status
- Restricted