Reproductive Biology and Histological Pattern of Hilsa Shad (Tenualosa ilisha) in Bangladesh
Keywords:Histology, Gonad, Tenualosa Ilisha, Bangladesh
An experiment was carried out to identify the peak breeding season of Hilsa in Bangladesh using gonadal histology through the standard procedure. A total 480 Samples were collected from Meghna River, Chandpur, from July 2012 to June 2013 and Tentulia river, Barisal, from June 2013 to June 2014. Histological sections of gonads were analyzed and ovarian and testicular stages were determined according to the OECD Guidance Document for Diagnosis of Histopathology of Fish Gonads. Maturing germ cells were observed every month where a higher amount of mature germ cells was found in December, January, and September to October, with a high in October. From February to June, the mature germ cells were less. Histological observations of testis suggested that T. ilisha spawns throughout the year, but significant spawning takes place in September-October and December-January with a high abundance of SPT (spermatids). During October, mature germ cells were mostly evident, and SPZ (spermatozoa) was in high proportion inside the LU (lumen of tubules). The gradual maturation of germ cells from early to ripened stages inside the testicular LU and peak maturity came during October. Females having ovaries at mature stages were considered those spawning or near to spawn. The occurrence of mature ovaries examined by external characteristics began in January and continued up to December. Percentage (%) occurrence of mature ovaries started to increase in February, peaked in October (75%), and decreased in December, January, and April. In fish ovary, the mature stages are generally observed at the most advanced stage of the ovary when the fishes are ready for spawning and when mean GSI values are comparatively high. In this study, advanced mature oocytes were found from in every month during the study period. The histological study of oocyte development and examination of external characteristics of ovaries suggested that T. ilisha spawns throughout the year, but significant spawning takes place in October –November and peaks in October.
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Copyright (c) 2023 Md. Hashibur Rahman, Bimal Chandra Das, Md. Moniruzzaman, Mousumi Akhter, Sabequn Nahar Swati, Tahamina Khatun, Md. Mizanur Rahman, Harunur Rashid
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