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Title: Juvenile abundance and post-larval incursion of mud crabs (Scylla spp.) in Chilika lagoon
Authors: Mohaptra, Anil
Mohanty, S. K.
Mohanty, Rajeeb K.
Keywords: Chilika lagoon
Scylla spp.
Megalopa incursion
Juvenile abundance
Issue Date: Dec-2011
Publisher: NISCAIR-CSIR, India
Abstract: was carried out on the juvenile abundance and post-larval incursion of two species of Scylla into the lagoon for period of two years from August, 2005-July, 2007. Occurrence of juvenile, S. serrata were throughout the year, while in S. tranquebarica, juveniles were not encountered during December-February. December-May register higher median CPUE values with peak in March for S. serrata. In S. tranquebarica, the peak juvenile abundance period was restricted to June-September with peak in July. The CPUE values for juveniles indicted that the recruitment was intense for S. serrata during post-winter (January-April) and for S. tranquebarica during monsoon (June-September). The crab seeds were available throughout the year which gave a clear evidence for the year round recruitment with the peak during the months of November-March for Scylla species from the Bay of Bengal to the Chilika lagoon. During the study period, the megalopa and first crab instar recruitment per net-hour collection was significantly higher during spring tides than neap tide phase (p< 0.05) and also higher incursion was observed in the night hours than day hours (p< 0.05). Significantly higher night collections of mud crab juveniles (mixed population of both species) from net box traps (khandas) were obtained during new moon phases (t=3.88; d.f.=11; P< 0.01).
Description: 834-840
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.40(6) [December 2011]

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