Growth of juvenile southern rock lobsters, Jasus edwardsii, is influenced by diet and temperature, whilst survival is influenced by diet and tank environment
Crear, B.J.; Thomas, C.W.; Hart, P.R.; Carter, C.G. (2000). Growth of juvenile southern rock lobsters, Jasus edwardsii, is influenced by diet and temperature, whilst survival is influenced by diet and tank environment. Aquaculture 190: 169-182. https://dx.doi.org/10.1016/S0044-8486(00)00391-4
In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486; e-ISSN 1873-5622, more
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| Authors | | Top |
- Crear, B.J.
- Thomas, C.W.
- Hart, P.R.
- Carter, C.G.
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| Abstract |
The growth and survival of juvenile (2-15 g) southern rock lobsters (Jasus edwardsii) were examined under various culture regimes. In Experiment 1, lobsters held at ambient (13-18°C) or 18°C were fed either fresh mussels, a commercial prawn diet or a moist diet. Growth (specific growth rate (SGR)=1.2-1.32% BW day-1), survival (98%) and food conversion ratios (FCR=1.26-1.29) were significantly better (P<0.05), and the protein component of the diet best utilised (protein productive value (PPV)=18.3-19%) (P>0.05), when the lobsters were fed mussels. There was a significant interaction (P<0.05) between diet and temperature. Growth at 18°C was significantly higher (P<0.05) than at ambient, except when lobsters were fed the prawn diet when there were no significant differences (P>0.05). The high acceptance and good consumption rate of formulated diets is a positive first step in the development of commercial diets for southern rock lobsters. In Experiment 2, lobsters held at ambient (13-18°C) or 18°C were maintained in tanks containing hides, substrates or neither. Hides increased survival (98%, cf. 60-75%) (P>0.05), although they did not increase growth (P>0.05) compared to tanks without hides. The provision of a substrate to aid the lobsters in the moulting process did not prevent cannibalism. Lobsters grew significantly faster (P<0.05) at 18°C (SGR=1.32% BW day-1) than at ambient (1.21% BW day-1), with the extra growth explained by a significantly higher (P<0.05) apparent feed intake. Most mortalities were due to cannibalism of soft-shelled lobsters, suggesting that the design and management of systems will be an important component of mass culturing juvenile J. edwardsii. |
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