Open AccessPARASITES AND PARASITOSIS IN FISH CULTURE IN PORTUGAL
Author(s) -
CarvalhoVarela M.,
CunhaFerreira V.,
Silva M. P. Cruz,
Monteiro M. T.,
GrazinaFreitas M. S.
Publication year - 1981
Publication title -
journal of the world mariculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0735-0147
DOI - 10.1111/j.1749-7345.1981.tb00271.x
Subject(s) - biology , trichodina , anisakis simplex , ichthyophthirius multifiliis , common carp , rainbow trout , mugil , cyprinus , zoology , fishery , mullet , salmo , gyrodactylus , helminths , digenea , fish farming , trout , pleuronectes , monogenea , fish <actinopterygii> , trematoda , aquaculture , gill
This paper deals with research work covering the period from May 1979 up to May 1981 and presents results of parasites and parasitosis diagnosed in a total of 195 complete dissections of six fish species from cultured and feral populations in Portugal: European eel ( Anguilla anguilla ) (49); mirror carp ( Cyprinus carpio specularis ) (29); common grey mullet ( Mugil cephalus ) (18); European plaice ( Pleuronectes platessa ) (11); rainbow trout ( Salmo gairdneri ) (42); common sole ( Solea solea ) (46). A list of protozoans and helminths identified with respective incidence is given: A) Feral fish: 1) European eel (17)— Echinorhynchus clavula 11.8% and Rhabdochona anguilla 5.9%; 2) common grey mullet (18)— Haploporus benedenii 16.7%, Neoechinorhynchus sp. 5.6%, and Raphidascaris sp. 5.6%; 3) European plaice (11)— Bothriocephalus sp. larvae 9.1%, Contracaecum aduncum 9.1%, and Cryptocotyle lingua 9.1%; 4) common sole (46)— Cucullanellus minutus 8.7%, Gyrodactylus elegans 4.3%, and Cestodes larvae 2.2%. B) Cultured fish: 1) European eel (32)— Trichodina anguillae 3.1% and Ichthyophthirius multifiliis 18.8%; 2) rainbow trout (42)— Eimeria truttae 2.4%, Hexamita intestinalis 4.8%, Holophrya simplex 2.4%, and Trichodina truttae 4.8%. The results show that feral fish harbor predominantly indirect life cycle helminths, in contrast with cultured fish only affected with protozoans, due mainly to overcrowding and deficient management, which propitiate a significant background infection. It was in these specimens that some lesions characteristic of protozoosis were found.