Seasonal Variation in the Microscopic Anatomy of Gonads and Gonadosomatic Index of Clupisoma garua
Seasonal Variation in the Microscopic Anatomy of Gonads and Gonadosomatic Index of Clupisoma garua
Riaz Hussain Pasha1*, Muhammad Zubair Anjum2, Imran Ullah2, Muhammad Akram Khan3, Adnan Ali4, Saif-Ur-Rehman5, Sana Batool2 and Arslan Emmanuel2
ABSTRACT
Seasonal variation in the gonads of Clupisoma garua was studied from the river Indus and its tributaries in Khyber Pakhtunkhwa and Northern Punjab, Pakistan. A total of 48 fishes of both sexes (n= 12 per season; 9 female and 3 male) were collected in different seasons of 2016-17. Preparatory phase of reproductive cycle was observed in spring with having thick tunica albuginea and rapid spermatogenesis in testes while appearance of cortical alveoli or yolk vesicle in cortex of cytoplasm in ovaries. Gonads attain maximum size and weight in spawning phase during summer. Free oozing of spermatozoa in testes and ovaries packed with fully grown eggs are the distinct features of this phase. The highest values of Gonadosomatic Index (GSI) for male and female in summer coincided with the histological structure of the gonads where they are in their spawning phase. Present study revealed that C. garua breed once in a year during summer season and this information will be helpful in culturing of this economically important catfish in Pakistan.
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