Maturation and spawning in Polynemus heptadactylus Cuv. and Val.

Kagwade, P V (1970) Maturation and spawning in Polynemus heptadactylus Cuv. and Val. Indian Journal of Fisheries, 17 (1&2). pp. 76-89.

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Abstract

The maturity cycle of Pclynemus heptadactyius has been described. The ripe ova measure 0.64 -1.04 mm in diameter, and each ovum contains one to many oil globules. Size at first maturity is 133 mm in female and 128 mm in males, when the fish has completed its second year of life. Females dominated in number in almost all length groups. Males were totally absent in length groups above 203 mm. Spawning is prolonged, and the release of ova is in batches. Individual fish spawns twice with an interval of six months; but with slight diversities in their individual spawning periods, the spawning of the species appears to be throughout the year. All the maturity stages are obtained all through the year. There are two peak spawning seasons, March-June and August-November, and two recruitments every year. The spawning intensity seems greater in ofTshore waters. The fish appears to spend the juvenile stages in inshore waters.

Item Type:	Article
Uncontrolled Keywords:	Maturation and spawning; Polynemus heptadactylus; fingered threadfin
Subjects:	Demersal Fishes > Threadfin breams
Divisions:	CMFRI-Kochi > Marine Capture > Demersal Fisheries Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Demersal Fisheries Division CMFRI-Kochi > Marine Capture > Demersal Fisheries Division Subject Area > CMFRI-Kochi > Marine Capture > Demersal Fisheries Division
Depositing User:	Dr. V Mohan
Date Deposited:	09 Jul 2010 07:06
Last Modified:	09 Sep 2015 15:11
URI:	http://eprints.cmfri.org.in/id/eprint/1372

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