TY - JOUR TT - SLAUGHTER CHARACTERISTICS OF BIGHEAD CARP (Hypophthalmichtys nobilis Rich.) REARED IN POLYCULTURE BASED ON NATURAL FEEDING IN THE PONDS AU - Nikolova, Lyudmila AU - Dochin, Kostadin PY - 2017 DA - April DO - 10.3153/JAEFR17007 JF - Journal of Aquaculture Engineering and Fisheries Research JO - J Aquacult Eng Fish Res PB - Özkan ÖZDEN WT - DergiPark SN - 2149-0236 SP - 51 EP - 57 VL - 3 IS - 2 KW - Bighead carp KW - Polyculture KW - Slaughter characteristics N2 - An experiment on slaughter characteristics of bighead carp (Hypophthalmichtys nobilis Rich.) reared in polyculture of thesame age, based on natural feeding in the ponds, was carried out at the Instituteof Fisheries and Aquaculture – Plovdiv, Bulgaria. Some of the ponds (FirstGroup) were not fertilized and others (Second Group) were supplemented withmanure at the rates corresponding to the standards of organic production. The structure of polyculture was one andthe same in all the ponds: K1– one-year old common carp (Cyprinus carpio L.) – 500 pcs.ha-1 (half being scale carp and theother half – mirror carp); Tp1 – one-year old bighead carp(Hypophthalmichtys nobilis Rich.) – 300 pcs.ha-1; А1 – one-year old grass carp (Ctenopharyngodon idella Val.) – 100 pcs.ha-1. The bighead carpreached a live weight of 0.766kgunder the experimental conditions, the fishes in the ponds fertilized withmanure being about 13.6% heavier comparedto fishes in the ponds of the other group. It was established that theslaughter yield and the relative share of the fillet in bighead carp were inaverage 54.3% and 35.4%, respectively, and, pondfertilization and the amount of phytoplankton did not have a statisticallysignificant effect on fish development. The pond had a significant effectexerted through its area and by overgrowing with macrophytes. 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