Survival rate and growth performance of Cyprinus carpio L. in intensively cultivated rice fields

Abstract

In the freshwater area of Vietnam's Mekong Delta, Barbodes gonionotus (Bleeker), Cyprinus carpio L. and Oreochromis niloticus (L.) are often reared together in rice ¢elds. The survival rate and speci¢c growth rate (SGR) of C. carpio showed a large variance. To understand the underlying reasons for this variation, we used multiple regressions for the variables SGR and survival rate, using the results of eight experiments in such polycultures at the Co Do rice^¢sh experimental station. The SGR of C. carpio declined with increasing rice density. Interspeci¢c competition with O. niloticus also had a negative e¡ect on C. carpio SGR.When fertilizer or manure is added to the trench of the rice^¢sh ¢eld or when extra food can be given to the ¢sh, O. niloticus seems more appropriate than C. carpio. The survival rate of C. carpio depended on season, C. carpio stocking weight and density and the biomass of wild ¢sh species. To obtain higher survival rates, one should stock fewer ¢sh but of a larger size, after thorough eradication of wild ¢sh species.

Impact of phased harvesting on population structure, feed intake pattern and growth performance of Macrobrachium rosenbergii DeMan (giant freshwater prawn) in polyculture with carps in concurrent rice–fish culture

“…With increasing rice biomass, the surface feeder (C. catla) and column feeders (L. rohita) gradually switched from feeding on plankton/ algal biomass to supplemental feed and to a diet primarily composed of detritus (Table 6). This process results in interspecific competition (Table 7) with bottom feeders (C. mrigala, C. carpio and M. rosenbergii), which is in agreement with the findings of Chapman and Fernando (1994) and Vromant et al (2004). Food preference and intake pattern of fish and prawn in the rice-fish system…”

Performance evaluation of concurrent rice-fish-prawn culture with and without cull harvesting

“…With the advancement of the culture season, the initial levels of organic carbon and available nitrogen and phosphorus in soil increased. This may be attributed to (1) additional nutrients from fish feed and fish faeces (Mohanty et al 2008), (2) fish grazing on the photosynthetic aquatic biomass and other components of the system, which aids in nutrient recycling (Vromant, Nam, Chau & Ollevier 2004), and (3) minimization of N losses (Cagauan 1995) and facilitation of P release from the sediment (Breukelaar, Lammens, Breteler & Tatrai 1994).…”

Performance of mono-sex tilapia (Oreochromis niloticus) in rice field with different ditch size

“…Moreover, integrated rice–fish farming is ecologically sound because fish improve soil fertility by generating nitrogen and phosphorus (Lightfoot, Costa‐Pierce, Bimbao & dela Cruz ; Giap, Yi & Lin ; Dugan, Dey & Sugunan ). This may be attributed to (1) additional nutrients from fish feed and fish excretes (Mohanty, Jena, Kumar, Sahoo & Chowdhury ), (2) fish grazing on the photosynthetic aquatic biomass and other components of the system, which aids in nutrient recycling (Vromant, Nam, Chau & Ollevier ) and (3) minimization of N losses (Cagauan ) and facilitation of P release from the sediment (Breukelaar, Lammens, Breteler & Tatrai ).…”