title: Impact of endosulfan (thiodan) EC 35 on behavior and dynamics of oocyte development in the teleostean fish, Colisa (Trichogaster) fasciatus.
abstract: Histomorphological responses of the ovary of a freshwater percoid fish, Colisa (T.) fasciatus, to endosulfan or thiodan EC 35 treatment, a popular pesticide, have been described. In addition, general behavioral changes of the fishes after treatment have also been recorded. Adult sexually mature females were used in the present study and all fish were in the prespawning phase of the ovarian cycle. The experiment was conducted under natural room temperature and day-night length for 30 days. Experimental fish were maintained in 1 ppm endosulfan solution, which was changed on alternate days after feeding with minced goat liver. Treated fish revealed that (a) the ovarian activity was retarded; (b) the ovarian wall became thicker; (c) the diameter of oogonia and stage I oocytes was not altered but that of stage II and III oocytes was greatly reduced; (d) the percentage of oogonia, stage I, and atretic oocytes increased considerably but that of stage II and III oocytes diminished significantly; and (e) yolk in the stage III oocytes appeared clumped and damaged.
authors: Department of Zoology, North-Eastern Hill University, Pachhunga University College, Mizoram, India.
authors: A C
authors: AC
authors: Pandey
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D004726:Endosulfan / Q000633:toxicity*; D005260:Female; D009865:Oocytes / Q000187:drug effects* / Q000254:growth & development; D010053:Ovary / Q000187:drug effects; D010473:Perciformes / Q000502:physiology*
chemical_list: D004726:Endosulfan