Age determination and growth-rate of redfish (Sebastes Sp.) from selected areas around Newfoundland

Sandeman, E. J. (1964) Age determination and growth-rate of redfish (Sebastes Sp.) from selected areas around Newfoundland. Masters thesis, Memorial University of Newfoundland.

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Abstract

This paper represents part of a continuing study of the distribution and biology of marinus and mentella redfish in the Northwest Atlantic. Reported here are the results of age determinations from the otoliths of mentella redfish from 5 areas around Newfoundland - Hermitage Bay, Southwest Grand Bank, Flemish Cap, Gulf of St. Lawrence and Hamilton Inlet Bank; and marinus redfish from Flemish Cap and Hamilton Inlet Bank. -- The data from Hermitage Bay, in addition to providing information on the growth-rate of the redfish, have provided a means of appraising the basic method of age determination and it is concluded that the otolith method, as used here, is valid to ages of at least 10 years. -- Growth of both marinus and mentella redfish was found to be adequately represented by the inverse exponential equation, and the parameters of the von Bertalanffy form of this equation were obtained by a least squares fit to the mean length at age values for males and females from each area. -- The difference in growth-rate between the sexes was examined and it was found, as was expected, that the females showed a faster growth-rate than the males. -- An examination of the growth curves and growth-rates of mentella from different depth levels on Hamilton Inlet Bank indicated that a considerable difference in growth pattern exists between fish from the shallower and deeper depths, and that the fish of the latter habitat tend to remain separate from those of the former, at least during the period of active growth. -- Comparisons of the growth curves presented here with other published redfish growth curves reveal, in most cases, a basic agreement between workers using otoliths, and a disagreement between these workers and others who use scales for determining the age of redfish.

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