Abstract- We examined rate of development to alevin hatching and fry emergence, embryo and alevin survival, and alevin and fry size for five Pacific salmon species. There was little difference among values for hatching and time predicted by a modified thermal sums model, power law model (log inverse Belehradek), or quadratic model".
Results
"Hatching Time- Accuracy of estimation of hatching time varied among the models investigated; more accurate models had lower residual sums of squares (Table2). Model (1), the thermal sums model, assumes that hatching requires a constant number of degree-days or accumulated thermal units (days x temperature) above 0°C. It generally provided the poorest description of hatching time, and its residual sum of squares was generally the highest of all the models. Model (2), a variant of the thermal sums model, assumes that hatching requires a constant number of degree-days above a threshold temperature that is estimated separately for each species".
Abstract- We examined rate of development to alevin hatching and fry emergence, embryo and alevin survival, and alevin and fry size for five Pacific salmon species. There was little difference among values for hatching and time predicted by a modified thermal sums model, power law model (log inverse Belehradek), or quadratic model".
Results "Hatching Time- Accuracy of estimation of hatching time varied among the models investigated; more accurate models had lower residual sums of squares (Table2). Model (1), the thermal sums model, assumes that hatching requires a constant number of degree-days or accumulated thermal units (days x temperature) above 0°C. It generally provided the poorest description of hatching time, and its residual sum of squares was generally the highest of all the models. Model (2), a variant of the thermal sums model, assumes that hatching requires a constant number of degree-days above a threshold temperature that is estimated separately for each species".