L. D. Heyward

White bass (Morone chrysops) were reared to maturity and spawned in 2 consecutive years to evaluate their hatchery performance and potential for reuse. Egg production and hatching could not be statistically compared between 2- and 3-year-old fish due to estimation of size data and pooling of hatch data in 1994. Three-year-old virgin females had a mean production of 81,413 larvae/kg body weight and an egg hatching level of 62.9%. No statistical differences (P ≤ 0.05) in latency, egg and fry production, or hatching were detected between 3-year-old virgin and previously strip-spawned fish....

Cultured shortnose sturgeon juveniles, age 11-330 days, were exposed to different salinity (0-35 ppt) and dissolved oxygen concentrations (2.0-5.0 mg/liter) in a series of experiments designed to examine tolerance levels. Tolerance to increased salinity improved with age. Fish 76 days old experienced 100% mortality in a 96-hour test when exposed to salinities ≥15 ppt while 330-day-old fish tolerated salinities as high as 20 ppt for a duration of 18 hours but exhibited 100% mortality at 30 ppt. Younger fish were also more susceptible to low oxygen concentrations than older fish. In a 6-hour...