Thermal dependence of embryonic growth and development in brown trout

✍ Scribed by A. F. Ojanguren; F. Braña

• Book ID: 104455573
• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 160 KB
• Volume: 62
• Category: Article
• ISSN: 0022-1112
• DOI: 10.1046/j.1095-8649.2003.00049.x

✦ Synopsis

Fertilized eggs from a brown trout Salmo trutta population in northern Spain were incubated in the laboratory at 4, 6, 8, 10, 12, 14, 16 and 18° C. Developmental stage and embryo size were monitored by taking samples at regular intervals. Survival was maximal at 8 and 10° C and decreased at higher and lower temperatures. Despite starting development, no embryo hatched at 16 and 18° C, which suggests an upper thermal limit for development between 14 and 16° C. Time required to reach a given ontogenetic stage decreased with increasing temperature. Embryos incubated at lower temperatures were larger at 50% hatching, and these differences persisted throughout the subsequent embryonic period until the start of exogenous feeding. A comparison with previously published data indicates low interpopulation variability in thermal sensitivity of embryonic development, even in consideration of the great latitudinal range of the studies.