Tolerance for ammonia in early stage spiny lobster (Jasus edwardsii) phyllosoma larvae

  • Bermudes M
  • Ritar A
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The tolerance of spiny lobster J. edwardsii phyllosoma to the effects of increasing levels of ammonia was assessed at Stages I to IV of larval development. The median lethal concentration (96-h LC sub(50)) for total ammonia (and corresponding NH sub(3)-N) were 31.6 (0.97) mg 1 super(-1), 45.7 (1.40 mg 1 super(-1), 52.1 (1.59) mg 1 super(-1), and 35.5 (1.01) mg 1 super(-1) at stage I, II, III and IV, respectively. When Stage II larvae were cultured through to Stage III at total ammonia concentrations of 0.5 (control), 1.4, 3.8, 6.3 and 9.5 mg 1 super(-1), the intermoult period increased significantly at and above 6.3 mg 1 super(-1) (from 11.2 days in controls to 13.2 days at 9.5 mg 1 super(-1)). Thus, the no-observable-effect-concentration (NOEC) of total ammonia (and corresponding NH sub(3)-N) at Stage II of 3.8 mg 1 super(-1) (0.12 mg 1 super(-1)) was used as the divisor in the acute:chronic ratio (i.e., 96-h LC sub(50) divided by NOEC) to estimate the concentrations at Stages I, III, and IV, which were 2.7 (0.08) mg 1 super(-1), 4.4 (0.14) mg 1 super(-1), and 3.0 (0.09) mg 1 super(-1), respectively. These results provide the basis for the design and management of systems for the culture of larval J. edwardsii.

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  • Michel Bermudes

  • Arthur J. Ritar

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