Seasonal and Age-Related Changes during Pubertal maturation of Captive Male Labeo rohita (Hamilton, 1822): A detailed Gross and Histological Study
Seasonal and Age-Related Changes during Pubertal maturation of Captive Male Labeo rohita (Hamilton, 1822): A detailed Gross and Histological Study
Khalid P. Loneand Irfana Liaqat*
ABSTRACT
Detailed gross and histological seasonal changes during the first reproductive maturation of Labeo rohita was undertaken. The study was done throughout the age of 18-29 months. For this purpose, nearly 500 fish were kept in ponds and sampled every month for the histology of the testis. After taking data regarding other somatic traits, the testes were fixed in buffered formalin and processed for routine histology and light microscopy. The annual maturity stages can easily be divided into five gross stages namely, immature and developing, maturing and developed, ripe and running, post spawning and spent-regressed. The testis in Labeo rohita were unrestricted and lobular. The maximum GSI (2.89±0.25) was seen in June when the photoperiod and temperatures were highest, while the lowest GSI was seen in October (0.09±0.01). The start of the monsoon rains was a cue for final maturation and spawning and by the middle of July; the testes were already declining and reached the minimum point in October. Both photoperiod and temperature have a strong influence on completion and regression of the spermatogenesis. This detailed study is the first from the Northern latitudes of the Indo-Pak subcontinent on the fish kept in commercial ponds.
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December 2019
Vol. 51, Iss. 6, Pages 1999-2399
