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Substrate catabolism related to reproduction in the bay scallop Argopecten irradians concentricus, as determined by O/N and RQ physiological indexes

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Abstract

Weight specific rates of oxygen consumption carbon dioxide production, and ammonia-N excretion, measured for a Florida population of the bay scallop Argopecten irradians concentricus between May and September, 1982 and October and November, 1983 were significantly correlated (P<0.0005) to environmental factors that co-varied seasonally with metabolic shifts related to reproduction. Mean O/N and CO2/O2 (RQ) molar ratios indicates that scallop energy metabolism varied over the course of the reproductive cycle. Resting stage individuals (May-early June) had RQ values close to 0.7, indicative of a predominantly lipid-based metabolism. During the initial stages of gametogenesis (late June-early July) scallops catabolized primarily carbohydrate, as evidenced by maximum O/N (>22) values and RQ values close to 1.0 RQ values >1.0 indicated a possible carbohydrate to lipid conversion during the period of cytoplasmic growth (late July-early September). As gametes matured and spawning commenced (late September-November), metabolism became primarily protein based, as indicated by O/N and RQ values around 9.0 and 0.8, respectively. This pattern of substrate catabolism supports existing data on the storage and utilization of specific energy reserves with respect to reproduction in this species.

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Author notes

  1. B. J. Barber

    Present address: Rutgers Shellfish Research Laboratory, P.O. Box 587, 08349, Port Norris, New Jersey, USA

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  1. Department of Marine Science, University of South Florida, 33701, St. Petersburg, Florida, USA

    B. J. Barber & N. J. Blake

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  1. B. J. Barber
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  2. N. J. Blake
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Communicated by J. M. Lawrence, Tampa

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Barber, B.J., Blake, N.J. Substrate catabolism related to reproduction in the bay scallop Argopecten irradians concentricus, as determined by O/N and RQ physiological indexes. Marine Biology 87, 13–18 (1985). https://doi.org/10.1007/BF00397001

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