ABSTRACT
The effects of pollutants [pesticides, polychlorinated biphenyls (PCB), hydrocarbons and surfactants] on different species of eel are reviewed. Two types of data are analyzed from the existing literature (72 references), namely those for contaminated waters and those for experiments under laboratory conditions. It is concluded that the eel is not as resistant as has generally been suggested.
Subject(s)
Anguilla , Water Pollutants, Chemical/toxicity , Animals , Detergents/toxicity , Female , Fish Diseases , Gills/drug effects , Gills/pathology , Hydrocarbons/toxicity , Liver/drug effects , Liver/pathology , Neoplasms/chemically induced , Neoplasms/veterinary , Ovary/drug effects , Ovary/pathology , Pesticides/toxicity , Polychlorinated Biphenyls/toxicity , Skin/drug effects , Skin/pathologyABSTRACT
The histology of the different stages of gonadal development (appearance of PGC, edification of gonad primordium, organization of an undifferentiated gonad, testicular or ovarian development) has been studied in fingerlings and juveniles of sea-bass in fish-culture conditions. Sex differentiation with a caudo-cranial gradient was direct and more in accordance with length than with age. Ovarian and testicular differentiation occurred in fish 11 to 23 months old and from 90 to 187 mm SL. Testis ova were frequently observed.
