Abstract
Of all stages of the sea lamprey, the eggs have the most exacting thermal requirements. The range of constant temperatures necessary for successful hatching is narrow, being 15-25[degree]C. This range may be extended to 12-26[degree]C and possibly beyond, if the eggs have developed to the head stage before they encounter temperature extremes. The ability to withstand high temperature characteristic of the post-embryonic stages of the species appears shortly before or after hatching. The role of temperature in the development of eggs under natural conditions is discussed.

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