The Lesser-spotted Dogfish (scyliorhinus Canicula): Parasites and Scavenger Habits
نویسندگان
چکیده
The occurrence of parasites in the digestive tract of the lesser-spotted dogfish (Scyliorhinus canicula) caught in the north western Mediterranean was analysed and the results compared with infestation levels in samples of the same species caught in the Atlantic (off the south west coast of Ireland). The relationships between parasite levels and the scavenger habits of the lesser-spotted dogfish are reviewed. The importance of adapting sanitary controls when working with lesser-spotted dogfish on board commercial fishing vessels is emphasised. It is suggested that protocols be adopted so as to prevent increased parasite loading in the lesser-spotted dogfish.
منابع مشابه
Lreference Only I Physiowgical Factors Regulating Appeiiie in the Lesser Spotted Dogfish Shark, Scyliorhinus Canicula
Physiological facton; regulating appetite in the lesse•· spotted dogfish shruk, Scyliorllinus canic1da (L.)
متن کاملInfection of the lesser spotted dogfish with Proleptus obtusus Dujardin, 1845 (Nematoda: Spirurida) reflects ontogenetic feeding behaviour and seasonal differences in prey availability.
Proleptus obtusus Dujardin, 1845 is the most common parasite infecting the gut of the lesser spotted dogfish (Scyliorhinus canicula, Linnaeus). This nematode is trophically transmitted from an intermediate crustacean host to the definitive elasmobranch host. Sexual and age-related differences in habitat occupancy and feeding behaviour of the lesser spotted dogfish make this parasite-host dyad i...
متن کاملStudies on the purification of gonadotrophin from dogfish ( Scyliorhinus canicula L . ) pituitary glands
While it is now widely accepted that two gonadotrophins, resembling mammalian LH and FSH, are produced by the pituitaries of birds, reptiles and amphibians, most work with bony fishes suggests the presence of only one gonadotrophin in this class of vertebrates (e. g. Burzawa-G6rQrd, 1971 ; Donaldson et al., 1972 ; BurzawaG6rard et al.,1975 ; Breton et al., 1976). This conclusion is, however, be...
متن کاملSingle nephron function of the lesser spotted dogfish, Scyliorhinus canicula, and the effects of adrenaline.
Function of the kidney and the nephron in the lesser spotted dogfish, Scyliorhinus canicula, was investigated by clearance, renal tubular micropuncture and ferrocyanide infusion techniques. 70% of the glomerular filtrate was reabsorbed within the renal tubule, producing slightly hypotonic urine. Glomeruli were: perfused and filtering (F); arterially perfused but not filtering (NF); or non-arter...
متن کاملMetal accumulation and metallothionein induction in the spotted dogfish Scyliorhinus canicula.
Recent studies indicate that elasmobranch fish respond differently to metal exposure than marine teleosts. Accumulation rates can be high, which despite the fact that normal background levels for metals in the marine environment are low, is worrying due to the long life span and late fecundity of most shark. The goals of the present study were to examine differences in accumulation rates and to...
متن کامل