Abstract

• In this study, a total of 240 samples were collected and dissected, from Kyaukphyu Market during the study period from February 2016 to January 2017. Identification was followed after Fisher and Whitehead (1974) and FAO (1984).The gonads were extracted from the specimens. Total body length, standard length, body weight and gonad weight were recorded and preserved in neutral buffer for further histological examination and to analyze the Gonosomatic indices (GSI).The GSI value of female is the highest (4.23± 3.12) in August and the lowest is (1.16 ± 0.06) in June. According to GSI value and based on its histological characteristics, four stages of cyclical changes i.e. maturity in March and July, spawning in April and August, , post spawning in May, September and October, resting in November, December, January, February and June were found in studied species. The breeding season of Spanish mackerel were two peaks in a year such as pre-monsoon and post-monsoon.