Abstract
Improves standard assessments of many commercially valuable fish species as Blue line snapper Lutjanus coeruleolineatus, is considered as an important commercial species harvested in the traditional fishery in the Sultanate of Oman. This will increase our knowledge in fish industry management. The present investigation of some biological aspects of Blue line snapper including male-female sex ratio, condition factor (Kn), gonado somatic index (GSI), length at first maturity for both sexes and developmental stages of ovary. Histological changes during the annual reproductive cycle and the stage of maturity of the ovary of Blue line snapper, L. coeruleolineatus are reported. Random collection of the species (449 males and 529 females) were taken monthly from Dhofar Governorate off the coast of the Arabian Sea at the period from March 2015 to February 2016. The results of this study reported male-female sex ratio was significantly different (P<0.05) from 1:1with dominate of females. The average monthly condition factor (Kn) values showed quite similar trend for both sexes with a slight higher values for females. The gonado somatic indices (GSI) data indicate that L. coeruleolineatus has prolonged breeding season from August to January with two peaks occurring in October and January. The length at first maturity was 28.1 ± 0.0 cm for males and 29.7 ± 0.0 cm for females. In this study five developmental stages of ovary of L. coeruleolineatus are recognized during development.
Highlights
The blue line snappers L. coeruleolineatus (Rüppell, 1838) belongs to the family Lutjanidae which contains 13 genera and about 110 species (Eschmeyer and Fong, 2015)
This study aims to determine the reproductive aspects of L. coerulineatus their male-female sex ratio, average monthly condition factor (Kn), the gonado somatic indices (GSI) and the length at first maturity for both sexes
In present study the reproductive aspects of Blue line snapper, Lutjanus coeruleolineatus were investigated
Summary
The blue line snappers L. coeruleolineatus (Rüppell, 1838) belongs to the family Lutjanidae which contains 13 genera and about 110 species (Eschmeyer and Fong, 2015). It is commonly known as snappers and called Neissar and Qalaya in Oman. There are many species under this family and subfamily found in the Indo-Pacific area (Allen, 1985). Lutjanidae distributed worldwide in tropical, subtropical, and occasionally temperate waters (Hastings et al, 2014). There are about 36 species of lutjanus are known from the Omani waters (Fouda, 1998). L. coeruleolineatus is a very colorful fish which characterized by yellow body, darker on back and whitish ventrally with distinguished blue (7-8) longitudinal stripes on the sides, a large black spot on the lateral line below the anterior portion of the soft dorsal rays and blue spots and broken lines on the head (Al-Abdessalaam, 1995)
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