Efeitos do caranguejo Pinnotheres ostreum em ostras Crassostrea rhizophorae

Nascimento, Iracima Andrade; Pereira, Solange Andrade

doi:10.1590/S0373-55241980000200054

Resumo

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.

ARTIGOS

Efeitos do caranguejo Pinnotheres ostreum em ostras Crassostrea rhizophorae^* * Pesquisa Subsidiada pela FINEP, com bolsa do CNPq (Proc. nº 1111.10580/76).

Iracima Andrade Nascimento; Solange Andrade Pereira

Instituto de Biologia, Universidade Federal da Bahia, Salvador, BA, Brasil

SYNOPSIS

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.

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Bibliografia

AWATI, R.R. & RAI, H.S. 1931. Ostrea cucullata. Indian zool. Mem., :88-90.
CHRISTENSEN, A.M. & McDERMOTT, J J. 1958.Life-history and biology of the oyster crab, Pinnotheres ostreum Say. Biol. Bull. Mar.biol. Lab. Woods Hole, 114:146-179.
FERNANDES, L.B. 1975. Aspectos fisio-ecológicos do cultivo da ostra do mangue, Crassostrea rhizophorae (Guilding, 1828). Influência da salinidade. Tese de Doutorado. Universidade de São Paulo, Instituto de Biociências, 81p.
GALTSOFF, P. 1964. The American oyster Crassostrea virginica. Fishery Bull. Fish Wildl.Serv. U.S., 64:1-480.
HAVEN, D. 1958. Effects of pea crabs Pinnotheres ostreum on oysters Crassostrea virginica. Proc. natn. Shellfish. Ass., 49 .77-86.
______ 1962. Seasonal cycle of condition indez of oysters in the York and Rappahannock rivers. Proc. natn. Shellfish. Ass., 51:42-66.
LOOSANOFF, V.L. 1965. The American or eastern oyster. Fishery Bull. Fish Wildl. Serv. U.S., 205:1-36.
NASCIMENTO, I.A.; PEREIRA, S.A. & COSTA E SOUZA, R. Determination of the optimum commercial size for the mangrove oyster (Crassostrea rhizophorae) in Todos os Santos Bay, Brazil, (no prelo).
OVERCASH, A.E. 1946. The use of measurement to determine the condition of oysters in Virginia. Master Thesis. Williamsburg, College of William and Mary, 31p.
SANDOZ, M. & HOPKINS, S.H. 1947. Early life-history of the oyster crab, Pinnotheres ostreum (Say).Biol. Bull. Mar. biol. Lab. Woods Hole, 93:250-258.
SEED R. 1969. The incidence of the pea crab, Pinnotheres pisum in the two types of Mytilus (Mollusca:Bivalvia) from Padstow, southwest England. J. Zool., Lond., 158:413-420.
______ 1971. A physiological and biochemical approach to the taxonomy of Mytilus edulis and M. galloprovincialis. Can. Biol, mar., 12(3):280-322.
SNEDECOR, G.W. 1956. Statistical methods, Fifth, ed. Iowa, State College Press, 534p.
STAUBER, L.A., 1945. Pinnotheres ostreum, parasitic on the American oyster,(Ostrea (C.) Gryphaea)virginica. Biol. Bull. Mar. biol. Lab. Woods Hole, 88:269-291.
WAKAMATSU, T. 1973. A ostra de Cananéia e o seu cultivo. Sao Paulo, SUDELPA/IOUSP, 141p.

*

Pesquisa Subsidiada pela FINEP, com bolsa do CNPq (Proc. nº 1111.10580/76).

Datas de Publicação

Publicação nesta coleção
06 Jun 2012
Data do Fascículo
1980

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] AWATI, R.R. & RAI, H.S. 1931. Ostrea cucullata. Indian zool. Mem., :88-90.

[2] CHRISTENSEN, A.M. & McDERMOTT, J J. 1958.Life-history and biology of the oyster crab, Pinnotheres ostreum Say. Biol. Bull. Mar.biol. Lab. Woods Hole, 114:146-179.

[3] FERNANDES, L.B. 1975. Aspectos fisio-ecológicos do cultivo da ostra do mangue, Crassostrea rhizophorae (Guilding, 1828). Influência da salinidade. Tese de Doutorado. Universidade de São Paulo, Instituto de Biociências, 81p.

[4] GALTSOFF, P. 1964. The American oyster Crassostrea virginica. Fishery Bull. Fish Wildl.Serv. U.S., 64:1-480.

[5] HAVEN, D. 1958. Effects of pea crabs Pinnotheres ostreum on oysters Crassostrea virginica. Proc. natn. Shellfish. Ass., 49 .77-86.

[6] ______ 1962. Seasonal cycle of condition indez of oysters in the York and Rappahannock rivers. Proc. natn. Shellfish. Ass., 51:42-66.

[7] LOOSANOFF, V.L. 1965. The American or eastern oyster. Fishery Bull. Fish Wildl. Serv. U.S., 205:1-36.

[8] NASCIMENTO, I.A.; PEREIRA, S.A. & COSTA E SOUZA, R. Determination of the optimum commercial size for the mangrove oyster (Crassostrea rhizophorae) in Todos os Santos Bay, Brazil, (no prelo).

[9] OVERCASH, A.E. 1946. The use of measurement to determine the condition of oysters in Virginia. Master Thesis. Williamsburg, College of William and Mary, 31p.

[10] SANDOZ, M. & HOPKINS, S.H. 1947. Early life-history of the oyster crab, Pinnotheres ostreum (Say).Biol. Bull. Mar. biol. Lab. Woods Hole, 93:250-258.

[11] SEED R. 1969. The incidence of the pea crab, Pinnotheres pisum in the two types of Mytilus (Mollusca:Bivalvia) from Padstow, southwest England. J. Zool., Lond., 158:413-420.

[12] ______ 1971. A physiological and biochemical approach to the taxonomy of Mytilus edulis and M. galloprovincialis. Can. Biol, mar., 12(3):280-322.

[13] SNEDECOR, G.W. 1956. Statistical methods, Fifth, ed. Iowa, State College Press, 534p.

[14] STAUBER, L.A., 1945. Pinnotheres ostreum, parasitic on the American oyster,(Ostrea (C.) Gryphaea)virginica. Biol. Bull. Mar. biol. Lab. Woods Hole, 88:269-291.

[15] WAKAMATSU, T. 1973. A ostra de Cananéia e o seu cultivo. Sao Paulo, SUDELPA/IOUSP, 141p.