[Lymnic molluscs from an Alto Araguaia area (Brazil)]. / Moluscos límnicos de uma área do Alto Araguaia (Brasil).

An analysis was carried out to determine the natural population of freshwater molluscs from 5 municipalities within the area of influence of the Couto Magalhães hydroelectric project. These municipalities cover a large area of the State of Goiás and Mato Grosso do Sul (Brazil). In this study 624 molluscs of the following species were examined: Drepanotrema anatinum, D. lucidum, D. depressissimum, Biomphalaria straminea, D. schrammi, Physa marmorata, Lymnaea columella, Pomacea and Eupera. One to their importance in public health, the discovery of Biomphalaria straminea and Lymnaea columella, intermediate hosts, respectively, of Shistosoma mansoni and Fasciola hepatica, deserves special mention.

Moluscos límnicos de uma área do Alto Araguaia (Brasil) / Lymnic molluscs from Alto Araguaia area (Brazil)

Säo mostrados os resultados do levantamento dos moluscos de água doce de 5 municípios da área de influência de uma usina hidrelétrica em estudo, formada pelas redondezas da Cachoeira Couto Magalhäes no Rio Araguaia. Foram examinados 624 moluscos procedentes de amostras coletadas em 20 coleçöes hídricas. O exame revelou a ocorrência de 8 gastrópodes pulmonados e um prosobrânquio, além de um bivalvo esferídeo. Devido ao envolvimento com a saúde pública, merece destaque o encontro de Biomphalaria straminea e Lymnaea columella, respectivamente hospedeiros intermediários de Schistosoma mansoni e Fasciola hepatica

[Inventory of fresh water snails in Mayotte, Comoro Islands]. / Inventaire des mollusques d'eau douce à Mayotte, archipel des Comores.

No trematodosis is known at the present time in Mayotte despite the close historical relationships between the Mayotte Archipelago and the neighbouring island of Madagascar, which is heavily infested. It is noteworthy that no intermediate host has been described in previous studies in Mayotte. An inventory of fresh water snails was performed from 1985 to 1988, in 53 experimental stations during the rainy and the dry seasons: 3,940 snails of eight different species were collected and further identified. The sole occurrence of Lymnaea natalensis constitutes a new record in Mayotte where there are now 14 different species of fresh water snails. According to the role of Lymnaea natalensis as a vector of Fasciola gigantica, particularly in Madagascar, the veterinary control of cattle importation into Mayotte is of great interest.

[Presence of Tarebia granifera (Lamarck) (Mollusca: prosobranchia) in several fresh water bodies in the municipality of Sancti Spiritus]. / Presencia de Tarebia granifera (Lamarck) (mollusca: prosobranchia) en diferentes cuerpos de agua dulce del municipio Sancti Spiritus.

The distribution of T. granifera in bodies of sweet water in Sancti Spiritus municipality is studied. It was found that it is widely distributed and that it occupies very varied biotopes, except in places with a high organic contamination.

Studies on the parasite fauna of juvenile Atlantic salmon, Salmo salar L., cultured in fresh water in eastern Scotland.

The parasite fauna of juvenile Atlantic salmon, Salmo salar L., at a smolt-rearing unit in eastern Scotland was monitored from two weeks after first-feeding until smolting occurred (May 1973-April 1975). A total of 625 fish was examined. Wild salmon from the river supplying the unit with unfiltered water were also examined. The cultured fish yielded eight protozoan and seven metazoan parasite species, all derived from wild fish. The parasite fauna of cultured fish became established quickly, subsequent changes involving loss of some species and increasing abundance of others. The metazoan parasite fauna was restricted to those species with free-swimming infective stages capable of entering the tanks.