Spawning Periodicity of Catfish, Ompok pabda (Hamilton 1822) from River Indus, Sindh, Pakistan
Spawning Periodicity of Catfish, Ompok pabda (Hamilton 1822) from River Indus, Sindh, Pakistan
Dharti Shahnawaz Thebo1*, Naeem Tariq Narejo2, Muhammad Hanif Chandio3, Faheem Saddar4, Shahnaz Rashid5, Asma Fatima5 and Ghulam Abbas5
ABSTRACT
The spawning periodicity of Ompok pabda from Indus River was elucidated for collection on monthly basis during February 2017 to January 2018. The measurement of egg size, somatic index of gonads and productive potential (fecundity) was considered of the fish under study. Size of the egg increased from March (0.81 mm) to May (1.05 mm) with one spawning peak in May. Somatic index percentage of gonads in both sexes also increased simultaneously from 0.95% (March) to 1.2% (May) for male, and from 3.18% (March) to 5.1% (May) for female. The value of both factors reflects that the fish possess only one spawning season during the year in the month of May. The enumeration of fecundity was based upon ten mature fish ranging from 15.5 to 30.0 cm in length and from 18.18 to 148.0g in weight. High potential of eggs production i.e. (1020 eggs) was recorded for fish with 30.0cm length and 148.0 g weight. The low fecundity (300 eggs) was recorded for fish with15.5cm in length and 18.8g weight. Production potential (fecundity) and its association with other factors like total length of fish, weight of fish, length and weight of gonads were enumerated and the fecundity found to be dependent with gonads weight as compared to other factors.
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