Contributions to the Knowledge of Parasite Fauna on Oreochromis niloticus Species Reared in Flow-through Installations and Earthen Ponds

Abstract

At Fish Culture Research and Development Center Nucet, Dambovita county (CCDP Nucet), in 2010 have done research on knowledge of parasite fauna of Oreochromis niloticus (Tilapia) species–Teleostei, Ciclidae, by investigating a number of 53 ex., consisting of fingerlings obtained in July at Nucet (T0) reared in a concrete tank with natural food and one year old fingerlings (T1) reared in two different systems: on polyculture into an earthen pond and into tanks with flowtrough system (Ewos tanks). In Ewos tanks stoking densities were 200 fish/m3 (1 fish/5 liters of water) and 325 fish/m3 (1 fish/3 liters of water) respectively. In pond (earthen pond), were stoked 200 fish/ha with young P. spathula 0+, C. carpio 2+ and Ct. idella 3+. Feeding of Tilapia was based solely on natural food from pond and in Ewos tanks Tilapia 1 was fed on special protean feed (Aller Tilapia XS) with a protein content of 33 %. Tilapia 1 registered a body growth of 16.8 times for variant with 1 fish/3 liters of water, 21.6 times for variant with 1 fish/5 liters of water and 38.3 times for variant in earthen pond. Ichthyopatological examinations revealed the presence of a total of 11 species of parasites belonging to the following systematic groups Fungus (2), Protista (7), Nematode (1) and Artropoda (1), parasitizing intensity ranging from single exemplars to multiple exemplars.