The Vertebrates: Fish (Rev, 1985)

Discusses the diversity and characteristics of fish, highlighting that they are part of the vertebrate group, which includes animals with backbones. Fish can be categorized into three main groups based on their skeletons: bony fish, cartilaginous fish (like sharks), and jawless fish (like hagfish). Key features of fish include gills for breathing, scales for protection, and fins for movement. Fish are cold-blooded and adapt to various aquatic environments, including freshwater and saltwater. Their reproductive strategies vary, with some laying eggs and others giving live birth. Fish play a crucial role in ecosystems and are a significant food source for humans, with aquaculture increasing fish supply.

Keywords:
fish, vertebrates, invertebrates, gills, scales, fins, cold-blooded, freshwater, saltwater, reproduction, aquaculture, ecosystems, diversity, adaptations, food source.

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