Interaction between handling cost and growth of the bivalve-feeder Halla okudai under rearing conditions, in relation to prey species.

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Abstract

In order to evaluate the interaction between handling cost and growth of the bivalve-feeder Halla okudai (Polychaeta: Lysaretidae), the observation of foraging behavior and measurement of energy budget were conducted in laboratory feeding experiments by offering three different bivalves: the short-neck clam Ruditapes philippinarum, the blue mussel Mytilus galloprovinciallis, and the Pacific oyster Crassostrea gigas. The total handling time was 1.6±2.7 times longer in the oyster-group (25.6 ± 9.3 h) than in the clam and mussel-groups, while the total searching and feeding time hardly varied with prey species. No significant difference in the amount of ingestion (4.5±5.3 kcal/polychaete per 15 days) was shown among the three prey groups. However, the growth increment was 1.5±2.1 times higher in the clam-group (1.85 ± 0.65 kcal/polychaete per 15 days) than in the other two prey groups. In contrast, the scope for active rate of respiration and jelly-like material secreted during handling was higher in the oyster-group (0.66 ± 0.14 and 0.24 ± 0.07 kcal/polychaete per 15 days, respectively) and mussel-group (0.62 ± 0.07 and 0.16 ± 0.05 kcal/ polychaete per 15 days) than in the clam-group (0.48 ± 0.09 and 0.06 ± 0.01 kcal/polychaete per 15 days), although there were no significant differences in the standard rate of respiration, excretion, feces and jelly-like material secreted during feeding among the three groups. These results indicate that growth of H. okudai increases with a decreasing handling cost, when feeding on the optimal prey species.

Journal

  • Fisheries science

    Fisheries science 66 (5), 863-870, 2000

    The Japanese Society of Fisheries Science

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