The Vertebrates: Fish (Revised, 1985)
Discusses the diversity of aquatic life, focusing on fish and invertebrates. It explains that fish are vertebrates with gills, scales, and various adaptations for movement and survival, while invertebrates, like jellyfish and starfish, lack backbones. There are three main groups of fish: those with bony skeletons, cartilaginous fish like sharks, and jawless fish like hagfish. The film highlights the differences in freshwater and saltwater fish, their reproductive behaviors, and the environmental adaptations necessary for survival. It also touches on the significance of fish in ecosystems and commercial fishing, emphasizing their importance as a food source for humans.
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