Cytogenetical studies on fishes. II. Karyotypes of four carangid fishes.

Cytogenetical studies in five Atlantic Anguilliformes fishes

The order Anguilliformes comprises 15 families, 141 genera and 791 fish species. Eight families had at least one karyotyped species, with a prevalence of 2n = 38 chromosomes and high fundamental numbers (FN). The only exception to this pattern is the family Muraenidae, in which the eight species analyzed presented 2n = 42 chromosomes. Despite of the large number of Anguilliformes species, karyo...

Microsporidian parasites in four species of carangid fishes from the Senegalese coast (West Africa)

Hepatic microsporidiosis was observed in four species of carangid fishes from the Senegalese coast. Being unable to positively identify the parasitic species, we provisionally placed them in the collective group Microsporidium Balbiani, 1984. The Microsporidium found in Caranx crysos and Caranx senegallus was labeled sp1, that found in Selene dorsalis was called sp2, and that found in Trachurus...

Studies on the Optomotor Reaction of Fishes

The optomotor reaction on fishes has been applied in many previous studies of their visual sensell-4l, their orientating behavior in stream5l. 6l or their swimming speed5l.1l, because this reaction was considered as a so-called unconditioned response which organisms show immediately when placed in a moving scene. However, the systematic study does not seem to have been conducted yet about the c...

Philometrids (Nematoda: Philometridae) in carangid and serranid fishes off New Caledonia, including three new species

A recent examination of newly obtained specimens of philometrid nematodes (Philometridae) parasitising carangid and serranid fishes off New Caledonia, South Pacific, revealed the presence of several nematodes of the genus Philometra Costa, 1845, including three new species: P. austropacifica n. sp. (males and females) from the ovary of Alepes vari (Carangidae), P. piscaria n. sp. (males) from t...

Cytogenetical studies on swine intersexes.