The fish classes: bony fish (Actinopterygii and Sarcopterygii), cartilaginous fish such as sharks and rays (Chondrichthyes), and jawless fish (Agnatha). United by gills and an aquatic life for the whole life cycle, which is what separates this group from an amphibian larval stage that later leaves the water.
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1. Wikipedia: Fish
WikipediaFish, Reproduction and life-cycle sectionQuote, Fish, Reproduction and life-cycle section
Over 97% of fish, including salmon and goldfish, are oviparous, meaning that the eggs are shed into the water and develop outside the mother's body.
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