major groups of fishes

1. QUIZ

2. _______ is the natural environments where fish live, feed, and reproduce.

3. 2-4. What are the 3 types of habitat?

4. 5. These are designated areas in oceans or seas where human activity, like fishing or mining, is restricted or completely prohibited to protect marine life.

5. 6. These are protected areas often set aside by governments to preserve important natural or cultural landmarks.

6. 7. Refers to human activities that aim to return a damaged or degraded ecosystem to a healthier, more natural state.

7. 8. Fish social behavior includes mating and courtship behavior, cooperative interactions, shoaling, social hierarchy, which is characterized by aggressive interactions to advance in social rank and protect territory, as well as resource-related activity.

8. 9-10. give 2 examples of social behaviour of fish

9. Exchange papers

10. MAJOR GROUPS OF FISHES

12. Fishes are broadly classified into three major groups: jawless fishes (Agnatha), cartilaginous fishes (Chondrichthyes), and bony fishes (Osteichthyes). These groups represent different evolutionary lineages and exhibit distinct anatomical features.

13. Agnathans: Jawless Fishes Jawless fishes or agnathans are craniates that represent an ancient vertebrate lineage that arose over one half-billion years ago. “Gnathos” is Greek for “jaw” and the prefix “a” means “without,” so agnathans are “without jaws. ” Most agnathans are now extinct, but two branches still exist today: hagfishes and lampreys. Hagfishes and lampreys are recognized as separate clades, primarily because lampreys are true vertebrates, whereas hagfishes are not. A defining feature of agnathans is the lack of paired lateral appendages or fins.

14. The clade Myxini includes at least 20 species of hagfishes. Hagfishes are eel-like scavengers that live on the ocean floor and feed on dead invertebrates, other fishes, and marine mammals. Hagfishes are entirely marine and are found in oceans around the world, except for the polar regions. Hagfish have slime glands beneath the skin that constantly release mucus, allowing them to escape from the grip of predators. Hagfish can also twist their bodies into a knot to gain a mechanical advantage while feeding and are notorious for eating carcasses from the inside out.

15. The clade Myxini includes at least 20 species of hagfishes. Hagfishes are eel-like scavengers that live on the ocean floor and feed on dead invertebrates, other fishes, and marine mammals. Hagfishes are entirely marine and are found in oceans around the world, except for the polar regions. Hagfish have slime glands beneath the skin that constantly release mucus, allowing them to escape from the grip of predators. Hagfish can also twist their bodies into a knot to gain a mechanical advantage while feeding and are notorious for eating carcasses from the inside out.

16. Lamprey hagfish

17. Cartilaginous fish” is an umbrella term for the Chondrichthyes, that encompasses sharks, rays, skates, sawfish, and chimeras. All these vertebrates have common characteristics of jaws, paired fins, gills, and a skeleton made of cartilage instead of bone.

19. Class Osteichthyes includes all bony fishes. Like all fishes, Osteichthyes are cold-blooded vertebrates that breathe through gills and use fins for swimming. Bony fishes share several distinguishing features: a skeleton of bone, scales, paired fins, one pair of gill openings, jaws, and paired nostrils.