Juvenile growth and survival of heat‐shocked triploid hybrid saugeyes, Stizostedion vitreum × S. canadense

Abstract

Triploid hybrid saugeyes may be a desirable stocking alternative because diploid saugeyes are fertile and can compromise the genetic integrity of parental stocks. Four groups of saugeye eggs were heat‐shocked 5 min after fertilization for 15 min at 31 °C, which resulted in an 86.7 ± 9.4% triploidy rate and 57.8 ± 24.3% survival to the eyed‐stage. Heat shocked and control saugeyes were stocked in two ponds for 40 days at 395 000 ind. ha –1 . Mean length and weight of triploid and heat‐shocked diploid saugeyes were greater ( P n =25 851) harvested from ponds were stocked for 153 days in O'Shaughnessy Reservoir, Ohio, USA. Triploids were 34 mm shorter and weighed 41 g less than heat‐shocked diploids ( P

Bibliographic Information