The collection, transport, and handling of fishes are procedures
usually followed in most scientific studies, as well as in fish culture. A
large load density is important to reduce transport costs (Grøttum et al.
1997). The most usual system of fingerling transportation in Brazil is
the closed system, with polyethylene bags (Kubitza 1997). The limitations
of a closed system are the supply of oxygen and the amount of
ammonia and carbon dioxide produced during transport. However, it
is possible to control these limiting factors and to reduce fish mortality
(Amend et al. 1982). For example, salts such as NaCl in adequate
amounts could reduce the loss of ions from fishes into the environment,
decreasing the energy demands with osmoregulation (Wurts
1995) and therefore reducing oxygen consumption. According to Kubitza
(1997), the use of salt increases the post-transport survival of
some sensitive fish species such as dourado, Salminus maxillosus.
Fingerlings of silver catfish, Rhamdia quelen, a Central and South
American freshwater fish, can survive for 96 hours in water containing
up to 8 g/L table salt (NaCl with I), and exposure to this concentration
has not changed its behavior (Marchioro 1997). The objective of the
present study was to determine the survival and osmoregulatory responses
(by measuring body Na+ and K+ levels) of silver catfish
fingerlings exposed to different salt concentrations in the water for
transport
The collection, transport, and handling of fishes are proceduresusually followed in most scientific studies, as well as in fish culture. Alarge load density is important to reduce transport costs (Grøttum et al.1997). The most usual system of fingerling transportation in Brazil isthe closed system, with polyethylene bags (Kubitza 1997). The limitationsof a closed system are the supply of oxygen and the amount ofammonia and carbon dioxide produced during transport. However, itis possible to control these limiting factors and to reduce fish mortality(Amend et al. 1982). For example, salts such as NaCl in adequateamounts could reduce the loss of ions from fishes into the environment,decreasing the energy demands with osmoregulation (Wurts1995) and therefore reducing oxygen consumption. According to Kubitza(1997), the use of salt increases the post-transport survival ofsome sensitive fish species such as dourado, Salminus maxillosus.Fingerlings of silver catfish, Rhamdia quelen, a Central and SouthAmerican freshwater fish, can survive for 96 hours in water containingup to 8 g/L table salt (NaCl with I), and exposure to this concentrationhas not changed its behavior (Marchioro 1997). The objective of thepresent study was to determine the survival and osmoregulatory responses(by measuring body Na+ and K+ levels) of silver catfishfingerlings exposed to different salt concentrations in the water fortransport
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