REPRODUCTIVE AND DEVELOPMENTAL ASPECTS OF JAPANESE ORNAMENTAL CARP

Aurelia Nica, E. Corbu, Adina Popescu, Daniela Cristina Ibanescu, I. Vasilean

Abstract
   The ornamental form of the carp, Cyprinus carpio L., provides a rich source of investigation for science and commercial possibilities alike. A study was made to investigate the effects of using carp pituitary extract on the spawning performance parameters of koi carp (Cyprinus carpio, L.). Brood carp used in the research- one female (total length 26,5 cm, weight 253 g) and one mascul (total length 28 cm, weight 237 g) - were reared in a pool from september 2015 to april 2019. The brooders were brought in the Aquaculture laboratory of Dunarea de Jos University of Galati and after acclimatization and treatment the fish were kept, separated on sex, in aquariums with a capacity of 150 liters, in a recirculating system. A single injection of 2 mg carp hypophysis was used for induction of the spawning of ornamental carp and this treatment caused successful ovulation. Hatching began 96 hrs after fertilization larvae emerged through the egg membrane, starting from the head. The length of larvae immediately after hatching was 6 mm, the mouth and anus were closed, and the pectoral fin was formed. Post larvae at 14 days after hatching had a total length of 11 mm, separate anal fin and dorsal membranes, and fin ray.

Key words: ornamental carp, spawning, fertilization, hatching, survival