Effect of four fluctuating temperature regimes on cui-ui,Chasmistes cujus, survival from egg fertilization to swim-up, and size of larvae produced

Abstract

We evaluated cui-ui, Chasm&es cujus, swim-up success, time of hatching and swim-up, and size of larvae at swim-up under four fluctuating temperature regimes (8.9-15.0,12.2-X3.3,15.0-21.1, and 17.8-23.9" C). The greatest swim-up success was at the 8.9-15.0" C regime and the lowest at the 15.0-21.1" C regime. Hatching and swim-up time varied inversely with incubation temperature. The largest (and presumably the most fit) larvae were in the 8.9-15.0" C treatment, whereas the smallest were in the 17.8-23.9" C treatment. Cui-ui appeared best adapted to the coolest of the four temperature regimes.

Effects of different step-wise temperature increment regimes during egg incubation of Atlantic cod (Gadus morhuaL.) on egg viability and newly hatched larval quality

“…Environmental conditions, especially temperature experienced during embryonic stages, affect the organ, morphological and physiological development of the fish embryo and determine hatch success and incubation time (Iversen & Danielssen ; Scoppettone et al . ; Nissling ; Fitzsimmons & Perutz ; Geffen et al . ; Kupren et al .…”

“…Temperature is an important environmental factor that influences the development of living organisms including fish. Environmental conditions, especially temperature experienced during embryonic stages, affect the organ, morphological and physiological development of the fish embryo and determine hatch success and incubation time (Iversen & Danielssen 1984;Scoppettone et al 1993;Nissling 2004;Fitzsimmons & Perutz 2006;Geffen et al 2006;Kupren et al 2011). Incubation temperature may also have long-lasting effects on the development, welfare and performance at later life stages (Eriksen, Espmark, Poppe, Braastad, Salte & Bakken 2008;Macqueen, Robb, Olsen, Melstveit, Paxton & Johnston 2008).…”

“…). Variable temperature during embryogenesis has also been shown to affect the larval size at hatch and the eventual growth and survival of larvae and juveniles (Scoppettone, Buettner & Rissler ). However, a gradual or step by step increase in temperature may allow the embryo to acclimatize to higher temperatures and the embryo may develop normally until hatch.…”

“…Rapid increase in the incubation temperature may have harmful effects on the embryo and the development can be arrested and eventually the embryo may die (Blaxter 1991;Brooks et al 1997). Variable temperature during embryogenesis has also been shown to affect the larval size at hatch and the eventual growth and survival of larvae and juveniles (Scoppettone, Buettner & Rissler 1993). However, a gradual or step by step increase in temperature may allow the embryo to acclimatize to higher temperatures and the embryo may develop normally until hatch.…”

Effects of Population Increase on Cui‐ui Growth and Maturation

“…It is a lake dweller and obligate stream spawner. Each spring adults migrate to the south end of Pyramid Lake and await environmental cues to migrate up the Truckee River, Pyramid Lake's only perennial tributary, to spawn (Scoppettone et al 1983(Scoppettone et al , 1993. The cuiui population declined as a result of disruption of its reproductive cycle (Scoppettone et al 1986).…”