A desk study of the relationship between temperature and hatching time for the eggs of five species of salmonid fishes

摘要: SUMMARY. Information on temperature (T°C) and time from fertilization to 50% hatch (D days) for five species of salmonid fishes has been used assess several mathematical models relating D T. No single equation gave the best fit all data sets. The power law with correction (α), log101D= log10a+b log10 (T- α) quadratic, log10D= log10a+bT+b1T2 (where a, b, b1, α are constants), each accounted over 97 % variance were good fits observed points species. There was little difference between predictions obtained these two equations within range temperatures. Therefore, simpler power-law model is preferred. However, there substantial within-species differences values predicted extrapolations 2 or 3°C down 0°C. When more low temperatures become available it will be possible make a objective choice model.