Title: CARP FISH REARING IN AUTOCHTHONOUS MIXED POLYCULTURE (CYPRINUS CARPIO, L., ARISTICHTHYS NOBILIS RICH. AND CTENOPHARYNGODON IDELLA VAL.)
Abstract: NIKOLOVA, L., L. HADJINIKOLOVA, K. DOCHIN, D. TERZIYSKI, R. ATANASOVA, A. STOEVA, G. GROZEV and E. PASKALEVA, 2008. Carp fish rearing in autochthonous mixed polyculture (Cyprinus carpio, L., Aristichthys nobilis Rich. and Ctenopharyngodon idella Val.). Bulg. J. Agric. Sci., 14: 139-144 For the needs of organic fish farming at the Institute of Fisheries and Aquaculture-Plovdiv, the levels of natural fish productivity of carp fish, reared in polyculture, based on a natural nutritive basis (an “autochthonous polyculture”) have been investigated. The experiment has been carried out in five fish ponds with a total area of 1.47 ha (two fish ponds – with 3000 kg.ha -1 of organic manure applied), three fish ponds (no organic manure applied). Before supplying with water, 300 kg.ha -1 of quicklime has been applied, and during the vegetation period – an additional quantity of 150 kg.ha -1 . The quantity of the organic manure and quicklime used has been conformed to the requirements for organic fish farming. The polyculture structure has been the following: one-year old carp - 500 pcs.ha -1 ; one-year old bighead carp - 300 pcs.ha -1 and two-years old grass carp - 100 pcs.ha -1 , with an average single fish weight (ASFW) in the fish-stocking of ponds, respectively – 0.071; 0.034 and 0.578 kg. During the vegetation period the quality of water has been within the technological standards. The ponds have ensured a good natural nutritive basis. From the experimental ponds max 645 kg.ha -1 of yield and 545 kg.ha -1 of gain have been obtained, when organic manure has been applied and max 537 kg.ha -1 of yield and 437 kg.ha -1 of gain, when no organic manure has been applied. The maximum carp gain has reached up to 241 kg.ha -1 (final ASFW of 0.555 kg); of the bighead carp – 200 kg.ha -1 (final ASFW of 0.699 kg); of the grass carp – 124 kg.ha -1 (final ASFW of 1.837 kg). At the conditions of the experiment, the two-summer old grass carp has exercised a reducing effect upon macrophytes growth.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
Access and Citation
Cited By Count: 2
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot