Parasitos em trutas-arco-íris (Oncorhynchus mykiss) criadas em sistema intensivo na região serrana de Santa Catarina, Brasil / [Parasites in rainbow trout (Oncorhynchus mykiss) raised in an intensive system in the mountain region of Santa Catarina, Brazil]

With the aim to determine the prevalence and mean parasite intensity in Oncorhynchus mykiss, 120 specimens were analyzed between April and September 2018. The cavity analysis was done by visual inspection, scraping of mucus, and extraction of the branchial arches. In the evisceration process, the intestine, the liver, and the kidney were separated, while the musculature was analyzed using the "candling table" method. All the collected material was preserved in 10% buffered formaldehyde and sent to the Laboratory of Parasitology and Parasitic Diseases, of the Center for Agroveterinary Sciences (CAV) of the University of the State of Santa Catarina (UDESC) for making the slides and identifying the parasites. Parasites were detected only in the analysis of the scraping of body mucus. Only specimens of the genus Trichodina were identified, in 34 of the 120 fish analyzed, in two collections, resulting in a prevalence of 28.33%. In total, 144 specimens of Trichodina were observed. The overall mean intensity was of 4.24 parasites in each fish analyzed. Characteristic lesions of infection by protozoa were not identified. This is the first report of the occurrence of Trichodina spp. in O. mykiss bred in an intensive system in Brazil, with low rates of parasitic infection in the mountain region of Santa Catarina.(AU)

Acuariidae (Nematoda) in Procellariiformes (Aves) on the southern coast of Rio Grande do Sul, Brazil / Acuariidae (Nematoda) em Procellariiformes (Aves) no litoral sul do Rio Grande do Sul, Brasil

Abstract Acuariidae nematodes are normally found in the digestive tract of aquatic birds, including Procellariiformes. Were examined Calonectris borealis (n = 4), Diomedea exulans (n = 1), Macronectes giganteus (n = 8), Thalassarche chlororhynchos (n = 5), Thalassarche melanophrys (n = 15), Procellaria aequinoctialis (n = 4), Puffinus gravis (n = 2) and Puffinus puffinus (n = 6), collected on the southern coast of RS, Brazil. A total of 16 birds (35.5%) were parasitized by two species of Acuariidae. Stegophorus diomedeae and Seuratia shipleyi were identified, with prevalences of 26.1% and 21.7%, respectively. Few studies on nematodes in Procellariiformes have been conducted. Here, the acuariids Seuratia shipleyi in Calonectris borealis and Procellaria aequinoctialis and Stegophorus diomedeae in Diomedea exulans, Procellaria aequinoctialis and Thalassarche chlororhynchos were reported for the first time.

Resumo Os nematoides Acuariidae são normalmente encontrados no trato digestivo de aves aquáticas, incluindo os Procellariiformes. Foram examinadas Calonectris borealis (n=4), Diomedea exulans (n=1), Macronectes giganteus (n=8), Thalassarche chlororhynchos (n=5), Thalassarche melanophrys (n=15), Procellaria aequinoctialis (n=4), Puffinus gravis (n=2) e Puffinus puffinus (n=6), coletados na costa sul do Rio Grande do Sul, Brasil. Dentre os exemplares examinados, 16 (35,5%) estavam parasitados por duas espécies de Acuariidae. Foram identificados Stegophorus diomedeae e Seuratia shipleyi, com prevalência de 26,1% e 21,7%, respectivamente. Existem poucos estudos relacionados a nematoides em Procellariiformes, e aqui registra-se pela primeira vez os Acuariidae Seuratia shipleyi em Calonectris borealis e Procellaria aequinoctialis, e Stegophorus diomedeae em Diomedea exulans, Procellaria aequinoctialis e Thalassarche chlororhynchos.