Using Local Produced Feed for Broodstock Rainbow Trout (Oncorhynchus mykis ) at Lao Cai

Abstract

A study was carried out to investigate possipility of using locally produced pellet feed forbroodstock rainbow trout (Oncorhynchus mykiss) at the cold water fish research center in Sapa, Lao Cai. Broodstock rainbow trout was imported from Finland and fed on 5 locally formulated feeds (TA1, TA2, TA3, TA4, TA5). These five formulated feeds, which were produced at Research Institute for Aquaculture No.1, contained different levels of crude protein (P) and crude lipid (L), viz. TA1 -36.0 Pr: 22.0 L; TA2-40.0 Pr: 20.0 L; TA3-45.0 Pr: 18.0 L; TA4-45 Pr: 16.0 L; TA5-45.0 Pr: 12.0 L. The spawning, fertilization and hatching rate of fish fed the experimental feeds were 47-91%, 82-85%, and 56-76%, respectively. The result showed that TA4 (45% protein and 16% lipid) obtained spawning rate >91%, fertilization rate >85%, hatching rate 74.3%, which were higher than those of the rest 4 formulars. Brood stock of rainbow trout could reach ful maturation and spawning with locally formulated feed containing 45% protein and 16% lipit .