Effect of different salinities on growth and survival of the juvenileprawn Macrobrachium tenellum (Smith, 1871)
2013
The effect of different salinities on growth and survival of juveniles
of the prawn Macrobrachium tenellum was studied. The different
treatments consisted in placing the organisms at 0, 5, 10, 15, 20, 25,
30, 35 and 40 ups by triplicate in glass tanks (10 org / tank) for a
period of 40 days. Balanced feed for shrimp 35% PC was supplied daily
at a rate of 10% of the total living biomas per tank. The treatments
with 0 and 10 ups showed 100% survival. Total mortality of the prawns
was observed from 35 ups and higher. The prawns in treatment at 10 ups
had a total weight gain (0,229±0,001 g), TCE (1,54±0,01) and
IP (84,98±0,36%) which were significantly higher than the other
treatments (P<0,05). A reduction of these parameters was observed as
salinity increased. The potential isosmotic point for juvenile M.
tenellum, under the conditions stated, is about 10 ups.
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