| Título: | Effect of stocking density on growth and fertility in the ornamental fish, Xiphophorus helleri |
| Autores: |
James, R; Department of Zoology, V.O. Chidambaram College, Tuticorin-628 008, Tamilnadu,
India Sampath, K; Department of Zoology, V.O. Chidambaram College, Tuticorin-628 008, Tamilnadu, India |
| Fecha: | 2011-07-08 |
| Publicador: | Central Marine Fisheries Research Institute (on behalf of Indian Council of Agricultural |
| Fuente: |
Ver documento |
| Tipo: | Peer-reviewed Article |
| Tema: | No aplica |
| Descripción: | In order to determine the optimum stocking density, the red swordtail fish, Xiphophorus helleri was reared at different stocking densities (10, 25, 50, 100 and 150 fish/50 l of water) under aerated and non-aerated conditions and studied the survival, growth and reproductive potential. An increase in stocking density reduced the survival, conversion rate and fertility in X. helleri. Significant (P < 0.05) negative correlation was obtained between density versus feeding parameters (feeding rate, conversion rate and conversion efficiency) or gonad weight and fertility under both aerated and non-aerated conditions. The aeration exhibited better responses than non-aeration in all density groups; however, low density groups (10 and 25D) did not show significant (P > 0.05)differences between them. Animals reared in 10D aerated group had released 266 young ones, while those reared in 25, 50, 100 and 150D aerated groups had released 68, 38, 32 and 12 young ones respectively during the experimental period of 154 days. Non-aerated density groups released less number of young ones than aerated groups. Although 25D group showed 100% survival, fish reared in 10D group displayed better feeding parameters, gonad weight and fertility than 25D group, and hence 10 fish/50 l (10D) is considered as optimum density for X. helleri. |
| Idioma: | Inglés |
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2 Observations on selected biological aspects of the spadenose shark (Scoliodon laticaudus Müller & Henle, 1838), landed along Saurashtra coast por Fofandi, Mahendra D.; Central Marine Fisheries Research Institute,Zala, Mangalsinh; Central Marine Fisheries Research Institute, Veraval,Koya, M.; Central Marine Fisheries Research Institute, Veraval | 7 OXYGEN CONSUMPTION OF MUGIL MACROLEPIS IN RELATION TO DIFFERENT SALINITIES por Mathew, C V; Calicut Research Centre of C.M.F.R. Institute, Calicut |
3 SHELL AREA IN RELATION TO LINEAR DIMENSIONS IN THE OYSTER CRASSOSTREA GRYPHOIDES por Durve, V S; University of Udaipur, Udaipur,Shrikhande, V J; University of Udaipur, Udaipur | 8 OCCURRENCE OF THE STING RAY DASYATIS (DASYATIS) MICROPS (ANNANDALE) ON THE MADRAS COAST AND IN THE GULF OF MANNAR por Nair, R V; Mandapam Regional Centre of C.M.F.R. Institute, Mandapam Camp.,Soundararajan, R; Mandapam Regional Centre of C.M.F.R. Institute, Mandapam Camp. |
4 NOTE ON A JUVENILE INDIAN PORPOISE NEOMERIS PHOCAENOIDES (CUVIER) CAUGHT OFF CALICUT por Balan, V; Calicut Research Centre of CMFR Institute, Calicut | 9 OCCURRENCE OF GELOINA BENGALENSIS (LAMARCK) (GELOINIIDAE: EULAMELLIBRANCHIA) IN THE COLEROON ESTUARY por Natarajan, P; Porto Novo Field Centre of C.M.F.R. Institute, Porto Novo |
5 SOME ORGANIC CONSTITUENTS OF SCALES OF THE FISH CHANNA PUNCTATUS AT DIFFERENT STAGES OF GROWTH por Saraswat, R C; K. R. College, Mathura, U.P. | 10 FOUR NEW RECORDS OF PROSOBRANCH GASTROPODS FROM MANDAPAM por Unnithan, Asokakumaran; Mandapam Regional Centre of C.M.F.R. Institute, Mandapam Camp. |