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Effects of eyestalk ablation, thoracic ganglion extract and gonad extract from 'spent spawners’on ovarian maturation in pond‐reared shrimps, Penaeus monodon Fabricius
Author(s) -
HAR CHAN HOOI
Publication year - 1991
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1991.tb00759.x
Subject(s) - biology , eyestalk , gonad , penaeus monodon , gonadosomatic index , thoracic ganglia , zoology , moulting , anatomy , saline , decapoda , shrimp , crustacean , fishery , ganglion , endocrinology , botany , larva , fecundity , population , demography , sociology
. Eyestalk‐ablated and non‐ablated pond‐reared Penaeus monodon Fabricius of two sizes (116·3 ± 2·8g and 67·9 ± 1·0g body weight (BW)) were injected with crude thoracic ganglion extract from 'spent spawners’(0·4mg/g and 1·0mg/g shrimp respectively). Controls (ablated and non‐ablated groups) received either equivalent amounts of crude muscle extract or crustacean saline. In another experiment, non‐ablatéd shrimps (67·4 ± 1·8g BW) were injected with crude gonad extract from 'spent spawners'. The controls received an equal volume of crustacean saline. Significant differences (P < 0·05) in the gonadosomatic index and the gonad index in relation to the carapace length were detected between eyestalk‐ablated and non‐ablated shrimps; the larger shrimps showing a greater difference following treatments with muscle and thoracic ganglion extracts. However, no significant differences (P > 0·05) were detected between the thoracic ganglion‐treated groups and the controls in either the eyestalk‐ablated or non‐ablated shrimps. Nor were significant differences (P > 0·05) observed between the gonad‐treated group and the control and between the two control groups receiving crustacean saline and crude muscle extract.