Growth, survival and bone alterations in Piaractus mesopotamicus larvae under different rearing protocols
The pacu (Piaractus mesopotamicus) is a neotropical freshwater fish. It is one of the most important species farmed in areas of the Parana and Paraguay Rivers basins. The effects of different rearing protocols on growth, survival and incidence of skeletal malformations in pacu larvae were analyz...
Guardado en:
| Autores principales: | , , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Universidade Federal de Santa Maria
2020
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| Materias: | |
| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/1634 |
| Aporte de: |
| Sumario: | The pacu (Piaractus mesopotamicus) is a neotropical
freshwater fish. It is one of the most important species farmed in
areas of the Parana and Paraguay Rivers basins. The effects of
different rearing protocols on growth, survival and incidence of
skeletal malformations in pacu larvae were analyzed. A total of
six experimental treatments were considered, consisting of: a semiintensive
larviculture (LS) in ponds; intensive larviculture (LIn)
in laboratory (both LS and LIn until 60 days of life); and mixed
larviculture, with 20 days of semi-intensive larviculture into
cages in ponds after 14 (L1), 21 (L2), 33 (L3) or 40 (L4) days of
laboratory larviculture. At the end of the experimental period, LS
larvae showed higher growth rate, with average weight values
(2.28g) and total length (TL-48.20mm) statistically higher than
the rest (P0.05). L1 to L4 treatments showed intermediate growth
values, without differences between them (P0.05), while LIn
presented the lowest growth (P0.05). Survival was around 75%
in all experimental groups, except LS, that presented a significantly
lower value (17.5%, P0.05). Skeletal abnormalities were
detected in all experimental treatments, but LIn and L1 presented
the lowest incidence. In no case, visible morphological alterations
were found. This study shows that prolonging pacu rearing
under laboratory conditions at high densities improves temporal
availability and survival of juvenile without affecting growth or
subsequent osteological development of fish. |
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