Influences of Fresh Meat and Dry Pellet on the Growth of Kuruma Prawn and the Environment.

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  • クルマエビの成長と飼育環境に及ぼす生餌およびドライペレット給餌の影響

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Abstract

Juveniles of Kuruma prawn, Penaeus japonicus, were fed dry pellet (treatment 1) and minced short-neck clam (treatment 2) separately in a closed culture system to examine the effects of food quality on growth and the environment. Growth of prawn was 121 % and 204 %, respectively in treatments 1 and 2 during the experimental period of 43 days. The food conversion ratio was higher in treatment 1 than in treatment 2. On the final day, total N concentration in the culture medium in treatment 1 was lower than in treatment 2 whereas total P concentration was inverse. N/P ratio was calculated to be 6.1 and 21.7 in treatments 1 and 2, respectively. In the case of organic sediment content, treatment 1 was higher than treatment 2. Nannochloropsis sp. density in the examination of algal growth potential of prawn culture water was higher in treatment 1 than in treatment 2 throughout the experimental period. The highest density of 43.43 × 106 Nannochloropsi sp. cells/ml was obtained with the prawn culture water taken at the 4th week. On the other hand, Chaetoceros calcitrans reached a lower density, 11.63 × 106 cells/ml at the maximum, showing little difference between treatments 1 and 2.

Journal

  • Aquaculture Science

    Aquaculture Science 43 (2), 205-211, 1995

    Japanese Society for Aquaculture Science

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