Effect of supplying four copepod densities (Acartia sp. and Calanus pacificus) on the productive response of Litopenaeus vannamei pregrown intensively at microcosm level
A seven-week experiment was performed to evaluate the effect of supplying copepods (Acartia sp. and Calanus pacificus), as exogenous feed during the intensive pre-growout phase of white shrimp (Litopenaeus vannamei), on the productive parameters and water quality. Five treatments were tested in whic...
| Authors: | , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2011 |
| Country: | México |
| Institution: | Universidad de Sonora |
| Repository: | Redalyc-USON |
| OAI Identifier: | oai:redalyc.org:48020747004 |
| Online Access: | https://www.redalyc.org/articulo.oa?id=48020747004 |
| Access Level: | Open access |
| Keyword: | Ciencias de la Tierra growth zooplankton Natural feed water quality intensive production |
| Summary: | A seven-week experiment was performed to evaluate the effect of supplying copepods (Acartia sp. and Calanus pacificus), as exogenous feed during the intensive pre-growout phase of white shrimp (Litopenaeus vannamei), on the productive parameters and water quality. Five treatments were tested in which shrimp were fed formulated feed and the addition of 0 (control), 1, 2, 4, or 8 copepods mL¿1. Treatments with 1 and 4 copepods mL¿1 had higher ammonia nitrogen levels than the rest of the treatments (>4 mg L¿1). Nitrite levels were significantly higher in the treatment with 8 copepods mL¿1, whereas nitrate levels were higher in all treatments relative to the control. Phosphate concentration was higher in the treatments with 4 and 8 copepods mL¿1. Shrimp from the treatments with 2, 4, and 8 copepods mL¿1 showed a higher survival (>93%), weight (>3.1 g), and final biomass (>77 g). The treatment with 2 copepods mL¿1 had the best feed conversion ratio (1.19) compared with the rest (>1.7). The results suggest that the additional supply of copepods as exogenous feed during the intensive pre-growout phase of shrimp culture can have a negative effect on the water quality, although survival was not affected, however, the effect on the production parameters was positive, indicating that the use of copepods as exogenous live feed is feasible in the culture of white shrimp. |
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