Reproductive cycle and maturity stages of Johnius carutta Bloch, 1793 off Visakhapatnam, south-east coast of India

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dc.contributor.authorKumar, M.S.
dc.contributor.authorRajeswari, G.
dc.contributor.authorKishore, B.
dc.date.accessioned2014-06-10T10:46:19Z
dc.date.available2014-06-10T10:46:19Z
dc.date.issued2013
dc.description.abstractA total of 3,406 gonad samples of Johnius carutta caught off Visakhapatnam (during 2008-‘09), were analysed to study the reproductive cycle and maturity stages. Seven maturity stages were observed in the gonads. Spawning season was assessed based on gonado-somatic index and monthly occurrence of matured females based on the general appearance of gonads, its relative length to the abdominal cavity and developmental stages of ova. Monthly distribution of ripe (stage VI) and spent (stage VII) females were considered for ascertaining the probable spawning season. The restricted brief spawning period lasts for three months from February to April and the species spawn only once in a year. The peak breeding activity was observed in the month of February (26.64%) followed by March (18.62%) and April (15.38%) in which high gonado-somatic index (GSI) values (February 3.50%; March 3.46%; April 2.74%) were recorded. Spent females were observed from June to December with peak in the month of August (13.78%) and October (10.80). The size at first maturity was estimated at 17.5 cm in females. The fecundity varied from 35,650 to 1, 96,496 in individuals of 140 to 217 mm and its mean fecundity rcorded was 81,290 ± 5014 (n=38).en_US
dc.identifier.citationIndian Journal of Fisheries 2013: 60(3), 23-26en_US
dc.identifier.urihttp://hdl.handle.net/123456789/1728
dc.language.isoenen_US
dc.publisherICARen_US
dc.subjectfecundityen_US
dc.subjectgonadsen_US
dc.subjectmaturity stagesen_US
dc.subjectsex ratioen_US
dc.subjectspawning seasonen_US
dc.titleReproductive cycle and maturity stages of Johnius carutta Bloch, 1793 off Visakhapatnam, south-east coast of Indiaen_US
dc.typeLearning Objecten_US
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