Incubation design criteria: First of a two part series on implementation of water reuse technologies in the design of incubation systems

摘要

The life stages which are normally considered within the incubation category include green eggs, eyed eggs, hatching, and alevins (sac fry). Green Eggs is the term primarily used to describe eggs which have not yet been fertilized. The outer shell (orclarion) is fairly soft. It is usually safe to move or handle the eggs at this stage. After fertilization, the shells harden and become more impermeable, and the cells begin to divide. This is a particularly sensitive time when handling should be minimized. When an eye is visible through the shell, the eggs are called Eyed Eggs. The embryo begins to move within the shell which increases permeability of the shell to metabolites. Salmonids hatch before the embryo development is complete.