Estratégia alimentar e densidade de estocagem para acarádisco (Symphysodon aequifasciata)
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Data
2009-05-29
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Universidade Federal de Goiás
Resumo
Four diets were tested to verify the effect of beef heart as feed enhancer for discus
fish, studding the growth, weight gain, survivor, consumption, water quality and
economic performance variables. Is was utilized 12 aquariums, distributed in 4
treatments and 3 replications. The treatments were: T1- 100% ration (42%PB); T2-
75% ration and 25% beef heart; T3- 50% ration and 50% beef heart and T4- 25%
ration and 75% beef heart. The diets were feed until fish s satiation, twice by day,
at 8:00h and 17:00h. After each feed time, 40% of water was changed. Each
aquarium contained 20 fishes, totalizing 240 discus fishes. The following water
quality parameters were available: pH, dissolved oxygen, temperature and
ammonia. There wasn`t effect of treatments on survivor. The dry matter
consumption was higher in 50% and 75% of beef heart diets, and better growth
and weight gain were obtained, but 50% of beef heart were at a low price, and
were considered the best diet. The relative condition factor (Kn) analysis indicate
better body condition of fishes according beef heart was higher in tested diets. The
economic performance shows that 75% of beef heart obtain lower cost index, but
50% of beef heart obtain higher partial liquid income. However beef heart diets
turn water cloudy, the analyzed water quality parameters keep suitable for fishes.
The conclusion is that beef heart is efficient as feed enhancer for discus fish and
that 50% of beef heart with 50% of ration provide better performance and higher
economic gain.
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Citação
BEERLI, Eduardo Lopes. Feeding strategy and stocking density for discus fish
(Symphysodon aequifasciata). 2009. 78 f. Tese (Doutorado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2009.