Scientific Publication

Reproductive biology of Nematalosa nasus (Bloch, 1795) off Mangalore coast, Karnataka

author(s) Mahesh - V - Somasekara - S R - Jayaraj - E G - Anjanayappa - H N - Ramya - V C - Benakappa - S
from Indian Council of Agricultural Research (ICAR)
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themes
regions
  • Southern Asia
  • Asia
  • World
citation

Mahesh et al., 'Reproductive biology of Nematalosa nasus (Bloch, 1795) off Mangalore coast, Karnataka', Journal of Experimental Zoology, India, vol. 19, 313-319, 2016

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Abstract

Nematalosa nasus is one of the important species comes under shads belongs to the clupeids group, clupeiod fisheries is one of the major fisheries in Indian country. In the present study, the complete reproductive biology with breeding seasonality of N. nasus along Mangalore coast studied for the first time. Six maturity stages were described macroscopically (male and female) and microscopically (female) throughout the maturation cycle. The spawning season in Mangalore lasts from September (2013) to April (2014), with peak spawning activity in October (2013) and November (2013). The size at first maturity was estimated to be 162 mm for both male and female respectively. The size frequency distribution of oocytes (ova diameter) provided evidence for its multiple spawning. The batch fecundity of this species was estimated between 1,02,093 to 8,32,129 eggs per individual. GSI indicated protracted spawning which extend from September (2013) to April (2014). The overall sex ratio exhibited equally was 1:1 (Male : Female)

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