Theses and Dissertations


Title: The effects of increased salinity and of feeding treatments on the survival and growth of striped bass, Morone saxatilis (Walbaum), fry in hatching jars, and fingerling striped bass in troughs

Name: Catchings, Euell Daniel

Degree: MS

Chair: Dr. E. W. Shell

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1973

Pages: 71

Keywords: Striped bass,Morone saxatilis,Salinity,Feeding,Survival,Growth,Feed conversion.

Abstract:

Research on the intensive culture of striped bass fry and fingerlings was conducted at the Fisheries Research Unit of Auburn University. The effects of water salinity and feeding treatments on the growth and survival of striped bass fry under intensive culture were studied. The fry were cultured in 7.6-liter jars with recirculating water. Cultures containing 1, 2.5 and 5 ppt salinity were studied. Feeding treatments consisted of (1) brine shrimp only and (2) brine shrimp initially with various transition periods to a dry feed diet.Fry fed brine shrimp during the first 18 days of culture followed by a 4-day or 12-day transition to dry feed grew faster than fry receiving brine shrimp throughout the culture period. By 59 days of age the fry receiving dry feed were 2 to 3 mm longer than those receiving brine shrimp alone. Survival among fry receiving (1) brine shrimp with a 12-day transition to dry feed, and (2) brine shrimp alone, was greater than for the fry receiving (3) brine shrimp with a 4-day transition to dry feed. The effect of feeding regime on striped bass fingerlings intensively cultured in 100-liter stainless steel troughs with automatic feeders and recirculating water was studied. Feed converions ranged from 1.71 to 3.10, with the lowest conversion (1.71) being attained at a feeding rate of 4.2% of body weight per day. A feeding rate of 8.4% produced the largest average size fish (4.2 g), but also resulted in the highest conversion (3.10). Growth rates were not affected by either the number of daily feedings or feeding intervals.

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