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Age-related changes in ovarian gross and histological characteristics during pubertal development in captive Catla catla (Hamilton, 1822) of age 18-29 months


Lone, KP and Sahar, S and Fatima, Shafaq, Age-related changes in ovarian gross and histological characteristics during pubertal development in captive Catla catla (Hamilton, 1822) of age 18-29 months, Pakistan Journal of Zoology, 44, (1) pp. 159-172. ISSN 0030-9923 (2012) [Refereed Article]

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Copyright 2012 Zoological Society of Pakistan

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Annual reproductive cycle of female Catla catla was investigated during the age of 18-29 months through gross and histological studies. Catla is a warm water gonochoristic summer spawner. Ovarian development is quite fast with the increase in the temperature (above 29C) and photoperiod (above 13.50 H) in April. Peak GSI (13.00 9.30 %) was observed in June concomitant with the maximum water temperature and photoperiod. On the basis of gross and histological studies, seven ovarian stages namely, immature/resting, regenerating, developing, maturing, mature/gravid, regressing and regressed were distinguished. Based on GSI studies, spawning seem to last for a very short period (mid June-mid July). Histological studies revealed six stages of oocyte development namely, chromatin nucleolar, perinucleolar, cortical alveolar, early vitellogenic, late vitellogenic and early germinal vesicle movement. Final cue for spawning seems to be the heavy monsoon rains. However, spawning in captivity was not observed in the present study as no final oocytes maturation or post-ovulatory follicles were seen. Total fecundity was measured in May and June separately. Relative fecundity was noted as 2537.80 857.21 oocytes/g of ovary amounting to 41.33 8.66 oocytes/g body weight in May of fish with 1861.40 138.70 g body weight and 49.83 2.05 cm total length. These values for the June fish were 1183.61 681.72/g ovary and 121.73 81.49/g body weight for fish of 1935.00 225.70 gram average body weight and 49.67 1.69 cm total length. Atretic follicles were quite prevalent in regressing ovaries. Since this is the first endeavor from Pakistan, results are discussed in the light of available literature and in comparison with the published work on this species elsewhere.

Item Details

Item Type:Refereed Article
Keywords:age-at-maturity, annual cycle, GSI, hepatosomatic index, oogenesis, photoperiod, reproductive biology, temperature
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal developmental and reproductive biology
Objective Division:Environmental Management
Objective Group:Other environmental management
Objective Field:Other environmental management not elsewhere classified
UTAS Author:Fatima, Shafaq (Miss Shafaq Fatima)
ID Code:84934
Year Published:2012
Web of Science® Times Cited:5
Deposited By:Research Division
Deposited On:2013-06-06
Last Modified:2013-09-10

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