Some biological parameters of the oyster (Crassostrea rhizopharae), during the spawning and post-spawning periods, were analised in relation to the infestation by the pea crab (Pinnotheres ostreum) The biological parameters considered were: size, total weight, wet and dry meat weight, and condition index. Utilizing the χ2 test these parameters and infestation by the pea crab were shown to to be associated. The incidence of pea crabs was higher during the spawning period than in the post-spawning period, reaching a maximum (20.3% infestation) in oysters with a size of 6 to 7 cm. The values of the condition index and percent of meat (wet and dry weight) for these oysters were significantly (P < 0.05) lower than for uninfested oysters. From these results there seems to be no doubt that the pea crab (V. ostreum) injures the mangrove oysters which supports the conclusion that these crabs are true parasites for C. rhizophorae
IFlACIMA ANDRADE! NASCIMINTO I SOLANGI ANDFlADI PIAlIFlA I nnltuto di alologll, Unlvlr.ldldl Fldlrll di alhll, allvlClor, BA, Bl'lell SYNOPSlS Some btologtcal parameters 01 the oyster (Cru80strea rhizophorae;. dunng the ,pawning and po,t-spawning pertods. were analised in retation tg the inje~tatiOf1 by the pea crab (pinnotl,lerea oatreum). The biolot!cal_parame.tt?' conlidered were: me_ total weightJ wet ~nd gry meat wellht. and conditlon tndex. Uti/izing the X' test these parameters ano inle,tation by the pea crrzb were i/aown to De a'lOclated. The incidence 01 pea crrzbs WQS higher duríng the spawning períod than in the po,t-,pawning período reaching a maximum (20.3% Inleltation) in oy'terr wlth a IÍze 01 6 to 7 cm. The values 01 the condltlon Index and percent 01 mt4t (wet and dry weight) lor the,e oylten were
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