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!Fishes 2
Development: In egg and Hatching
6
Biology
Undergraduate 4
11/10/2009
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Term
In the egg
 Definition
standard vertebrate cleavage
Term
Initial Hatching
 Definition
softening of chorion: enzymes secreted by mouth or head of embryo
Term
How long?
 Definition
temperature dependence; diapause of some species
Term
Hatching trigger?
 Definition
can be triggered by external events (flooding of intertidal eggs in Fundulus)
Term
Short Incubation of eggs
 Definition
tropical reef fish, ca 12 hrs
Term
Long Incubation of eggs
 Definition
trout and salmon, up to 6 months in gravel; egg cases of elasmobranchs
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