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Yeshwantrao Chavan Mahavidyalaya , Tuljapur , Dist.-Osmanabad-413 601 (MH), INDIA

Yeshwantrao Chavan Mahavidyalaya , Tuljapur , Dist.-Osmanabad-413 601 (MH), INDIA. Department of Fishery Science. Dr S L Bhalkare Head and Assistant prof. B.Sc. First Year Semester I Paper I Topic: General Chas.of Fishes. Characteristics of Fishes. Class: Agnatha. Jawless fish

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Yeshwantrao Chavan Mahavidyalaya , Tuljapur , Dist.-Osmanabad-413 601 (MH), INDIA

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  1. YeshwantraoChavanMahavidyalaya, Tuljapur, Dist.-Osmanabad-413 601 (MH), INDIA Department of Fishery Science Dr S L Bhalkare Head and Assistant prof.

  2. B.Sc. First Year Semester I Paper I Topic: General Chas.of Fishes

  3. Characteristics of Fishes

  4. Class: Agnatha • Jawless fish • Round, tube-like bodies covered with slimy skin • No scales, bodies made of cartilage • Ex. Lampreys, Hagfish, etc.

  5. Class: Condrichthyes • Cartilaginous fish • Moveable jaws and scales present • Ex. Sharks, Skates and Rays

  6. Class: Osteichthyes • Bony Fish • Skeletons made of hard bone • Scales and a swim bladder present • 95% of ALL fish belong to this class

  7. Pyloriccecum Esophagus Stomach Kidney Brain Swimbladder Vertebra Gills Spinalcord Muscle Mouth Operculum Heart Anus Urinarybladder Reproductiveorgan Pancreas Gallbladder Intestine Liver Anatomy of a Fish

  8. Fish Circulation • Fish have gills that absorb O2 from the water, and release CO2 • Fish have a simple, two-chambered heart

  9. Gill Structure & Function • Gills act as a counter current gas exchanger.

  10. Countercurrent Exchange O2 Concentration

  11. Fish Adaptations • Some fish have remained unchanged for millions of years • Ex. Coelacanth • Some fish are able to “walk” on land, and can survive for long periods of time without water • Ex. Lungfish

  12. Fish Adaptations • Many fish function as a top predator in their ecosystem • Ex. Great Barracuda, Arowana

  13. Fish Adaptations • Many fish are adapted to survive conditions in the deep ocean • lack of sunlight • extreme pressures • Ex. Angler Fish

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