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Nitrogen Conversion in a Bivalve Culture System

Published online by Cambridge University Press:  11 May 2009

Ø. Strand ,
P.T. Solberg  and
T. Magnesen
Ø. Strand
Affiliation:
Department of Fisheries and Marine Biology, I-foyteknologisenteret, N-5020 Bergen, Norway.
P.T. Solberg
Affiliation:
Department of Fisheries and Marine Biology, I-foyteknologisenteret, N-5020 Bergen, Norway.
T. Magnesen
Affiliation:
Centre for Studies on Environment and Resources, Heyteknologisenteret, N-5020 Bergen, Norway.
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Extract

Bivalve spat were grown in an on-shore upwelling nursery using a landlocked heliothermic marine basin (Norwegian oyster-poll) as a food production system and thermal source. Several manipulations, involving artificial fertilization (N, P and Si), were performed in order to enhance the production capacity. Based on data from a monitoring programme (May-August) on physical, chemical and biological variables in the system, main paths of nitrogen flow and dynamics of bivalve production and nitrogen conversion efficiency were described. The conversion efficiency of the system, bivalve N production over estimated new N, of which 86% was fertilizer nitrogen, was 16·2% for the experimental period of 93 days. During this period the decrease in efficiency from levels of 22–25% to 8% was probably due to the transition from nitrate-limited to light- and grazing-limited phytoplankton production. The food utilization efficiency, bivalve N production over available particulate N in the nursery, was 19·8% for the experimental period. The efficiency increased in July from 19·4% for the first two weeks to 27·0% during late July. This was probably due to a higher food value of the phytoplankton community in late July, dominated by Skeletonema costatum (Bacillariophyceae) and Nitzschia sp., than the phytoplankton community in early July, dominated by Fragilaria sp.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 76 , Issue 1 , February 1996 , pp. 57 - 72
Copyright
Copyright © Marine Biological Association of the United Kingdom 1996

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