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1977•Indian Journal of FisheriesOpen access

MATURITY AND SPAWNING OF IOHNIUS (JOHNIEOPS) SINA (CUVIER) AT CALICUT DURING 1969-72

K V Somasekharan Nair

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Abstract

The percentage occurrence of mruture fish and ova-diam<:ter 'frequency in lohnius (IQhnieops) sina (Cuvier). indicated pmlonged spawning of the species. The minimum size at first maturity has been fqund to be at an average size of 115 mm for females. The condition factor had the minimum value at a length of 115 mm for females and 125 mm fur· males, when they are considered to be mature for the first time. Sexes appeared in equal proportion in most of the months. Dominance of females in the population was noticed at 115mm total length and upwards. Fecundity has been found to vary from 12,774 to 1,51,697 in specimens of the size range 124-174 mm.

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The percentage occurrence of mruture fish and ova-diam<:ter 'frequency in lohnius (IQhnieops) sina (Cuvier). indicated pmlonged spawning of the species. The minimum size at first maturity has been fqund to be at an average size of 115 mm for females. The condition factor had the minimum value at a length of 115 mm for females and 125 mm fur· males, when they are considered to be mature for the first time. Sexes appeared in equal proportion in most of the months. Dominance of females in the population was noticed at 115mm total length and upwards. Fecundity has been found to vary from 12,774 to 1,51,697 in specimens of the size range 124-174 mm.

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Available abstract

The percentage occurrence of mruture fish and ova-diam<:ter 'frequency in lohnius (IQhnieops) sina (Cuvier). indicated pmlonged spawning of the species. The minimum size at first maturity has been fqund to be at an average size of 115 mm for females. The condition factor had the minimum value at a length of 115 mm for females and 125 mm fur· males, when they are considered to be mature for the first time. Sexes appeared in equal proportion in most of the months. Dominance of females in the population was noticed at 115mm total length and upwards. Fecundity has been found to vary from 12,774 to 1,51,697 in specimens of the size range 124-174 mm.

Key concepts: Fecundity, Biology, Dominance (genetics), Fish <Actinopterygii>, Animal science, Maturity (psychological), Population, Fishery

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MATURITY AND SPAWNING OF IOHNIUS (JOHNIEOPS) SINA (CUVIER) AT CALICUT DURING 1969-72 — Research Paper | ScholarLens