In the present work, fat, skin, liver and muscle samples from Leptonychotes weddellii (Weddell seal, n=2 individuals), Lobodon carcinophagus (crabeater seal, n=2), Arctocephalus gazella (Antarctic fur seal, n=3) and Mirounga leonina (southern elephant seal, n=1) were collected from King George Island, Antarctica, and analysed for POPs (PCBs, organochlorine pesticides and PBDEs) and stable isoto...

Levinseniella (Monarrhenos) capitanea n. sp. is described from metacercariae on the hepatopancreas and gonads of Callinectes sapidus Rathbun from Louisiana and Mississippi. It can be distinguished from all other members of the genus by possessing 11–21 atrial pockets and an acetabulum larger than the oral sucker, not possessing a pharynx nor well-developed ceca, and being 1.9–3.6 mm in length. ...

The “puyen”, Galaxias maculatus, is a small, autochthonous fish (no longer than 10 cm in this region). This species is protected in the Nahuel Huapi National Park and Reserve. Information on its biology is available in RM McDowall (1968 Fish Res Bull 2: 1-84, 1972 J R Soc New Zel 2: 325-367), DA Pollard (1971 Aus J Mar Fresh Res 22: 91-123) and RA Ferriz (1987 Rev Mus Arg B Riv 5: 29-38). Tylod...

Parachanna obscura, the African snakehead fish, were randomly selected and subjected to parasitologic investigations. A total of three hundred and forty specimens were monthly obtained over a period of one year. Helminth infections was observed to have a prevalence of 5.9% which accounts for twenty of the specimens to be infected with gastrointestinal helminth parasites. Parachanna obscura harb...

Lecithaster helodes n. sp. is described from Mugil curema and M. cephalus. It differs from the closely related L. mugilis Yamaguti, 1970 by having four rather than three ovarian lobes and other minor differences. Discussions and measurements are presented for L. confusus Odhner, 1905, L. leiostomi Overstreet, 1970, Hysterolecitha elongata Manter, 1931, Aponurus pyriformis (Linton, 1910) n. comb...