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Evaluation of 36%‐Protein Diets with or without Animal Protein for Rearing Tank‐Hatched Golden Shiner Fry in Ponds
Author(s) -
Lochmann Rebecca,
Stone Nathan,
Phillips Harold,
Bodary Melinda
Publication year - 2004
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/a04-013.1
Subject(s) - biology , zoology , feed conversion ratio , fish <actinopterygii> , fishery , body weight , endocrinology
The objective of this study was to determine whether fry of golden shiners Notemigonus crysoleucas reared in ponds differed with respect to growth, survival, feed conversion, total yield, condition, and response to low dissolved oxygen when fed a practical diet of 36% protein from animal and plant sources (five ponds) versus a diet of only plant sources (six ponds). Newly hatched fry (1 mg) were stocked at 2.5 × 10 6 /ha in 12 fertilized ponds (0.04 ha each). Fish were fed twice daily at a rate of 8.0–15.9 kg/ha for 12 weeks. Chlorophyll a was not different between diets, indicating that natural food production in ponds was similar between treatments. Between‐treatment differences in average individual weight (0.56–0.59 g), relative weight (114.4– 115.6), Fulton's condition index ( K = 0.88), total yield (40.8–45.6 kg), feed conversion (0.85– 0.95), and survival (75.9–79.2%) were not significant. Postharvest survival of fish exposed to low dissolved oxygen at 20°C in a laboratory test was not affected by diet. These results indicate that diets with all plant protein sources are suitable for raising golden shiners in fertilized ponds from first‐feeding fry to small juveniles.