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Growth and body composition of juveniles of Pterophyllum scalare (Lichtenstein) (Pisces; Cichlidae) at different densities and diets
Author(s) -
DEGANI G.
Publication year - 1993
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1993.tb00651.x
Subject(s) - biology , zoology , population , growth rate , fish <actinopterygii> , fishery , composition (language) , body weight , weight gain , endocrinology , linguistics , philosophy , geometry , mathematics , demography , sociology
. The effect on the growth of freshwater angelfish, Pterophyllum scalare (Lichtenstein) (Pisces; Cichlidae), of different densities of population and diet compositions was studied. The results show that increasing the population density from 50 fish/m 2 to 200/m 2 significantly decreased the rate of growth of fingerlings, and that this effect is correlated to the size of fish. No significant differences were observed in growth between diets containing 37%, 41% or 47% protein. However, the addition of live food (artemia) to the diet significantly raised the growth rate, especially in the higher protein diets. Body composition shows no changes during the growth periods, with a mean of 64·68% body protein, 35·47% dry weight fat and no significant differences in the percentage of residual ash through the growth period. The food conversion rate was very low, ranging from 1·15 to 1·31. Total production increased with density, from 4·0g/m 2 /day (50 fish) to 13·7g/m 2 /day (200 fish) over a period of 60 days.