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Editor's Notes
- Organisms have to possess this structure at least at some part of their development in order to be defined as Chordates.
- Most fish belong to Osteichthyes. They have a bony skeleton which is opposite to cartilaginous skeleton.
- Ectothermic means that fish have a variable body temperature which closely matches that of the surroundings
- Yolk is contained in the egg How many eggs may a fish lay depends on the type of fish, how heavy it is and how big are its eggs
- Extracting oxygen from water is harder and consumes more energy that extracting it from air