Some aspects of reproductive biology of the Bartail Flathead Platycephalus indicus in Bardawill lagoon, North Sinai, Egypt

Document Type : Original Article

Authors

1 Fisheries, faculty of Aquaculture and marine fisheries,Arish university, North Sinia, Egypt

2 Fac. Environ. Agric. Sci. - Arish Univ.

3 Central Laboratory for Aquaculture Research (CLAR), Agriculture Research Center.

4 aquaculture and marine fisheries, arish university

Abstract

The study was carried out to investigate some biological aspects as length-weight, sex ratio, Gonado-Somatic Index (GSI) and fecundity of the Bartail Flathead (Platycephalus indicus) in Bardawill lagoon, North Sinai, Egypt. Monthly samples of Platycephalus indicus collected from the commercial catch in different landing sites of the lagoon during two fishing seasons 2019-2020. In the present study the total length of combined sexes of the investigated specimens of P. indicus varied from 17.9 to 52.1 cm with weights ranging between 27.6 and 1003.7 g. Monthly, average gonad somatic index increased noticeably in both females and males in October and reached the highest value in November. With peaks in November Where spawning season. The Hepatosomatic Index increased noticeably in females and males from October to December. The overall sex ratio indicated that the females are dominant during most of the year, except in October, which show the lowest number and the sex ratio was 1.0:2.01 around the year. The length at first mature (L50) was determined as at 35 cm, 38.8 cm and 37.5 cm for males, females and combined sexes respectively. The absolute fecundity (F) was increased with a total length and described by power equation F = a Lb as F = 8.2863 L2.7892. The number of eggs gradually increased from 81657 to 476291eggs eggs per cm.

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Egyptian Journal for Aquaculture
Volume 13, Issue 3
September 2023
Pages 1-19

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