Comparação de dois substratos para oviposição de tilápia-nilótica (Oreochromis niloticus) (Prisces: Cichlidae)

Resumo

This experiment was implanted at the Hydrobiological and Fisheries Management Station at the Federal University Of Vicosa and was realized from October, 1981 to March, 1982. The objective was to determine the influence of bottom substrate on the reproductive sucess of Oreochromis niloticus. Concrete tanks (5x5x1 m) were used: one group of tanks with bottoms half concrete-half mud; and, one group with bottoms half concrete-half sand. There were three repli- cations each tank was stocked with 12 adult O. niloticus as 8 ¢ ¢ and 4 d d. Based on the number of fry produced, there was no great difference between substrates; however, the numbeér o1 nests was greater in the tanks with partial mud substrate than with sand.