PPT-The Vertebrata I Introduction to the Fishes

Traditional organization of Vertebrate Taxonomy AGNATHA Jawless Fishes CHONDRICHTHYES Sharks skates rays and chimeras OSTEICHTHYES Bony Fishes AMPHIBIA Amphibians REPTILIA Reptiles MAMMALIA Mammals. Invertebrate chordates. Tunicates and lancelets. Vertebrate chordates. Fishes. Amphibians. Reptiles. Birds. Mammals. Nonvertebrate Chordates . Tunicates (sea squirts). Squirt water when their siphons are disturbed. 1. What is a fish?. Aquatic vertebrates that have paired fins, scales, and gills.. Of course there are exceptions . . There are approx. 24,000 living species. 2. Questions. What is the function of fins?. Biology 342. Phylogeny . of . Basal . Tetrapoda. The group of bony fishes that gave rise to land-dwelling vertebrates and their descendants (. Tetrapoda. , or colloquially, “. tetrapods. ”) was the lobe-finned fishes, or . Biology 342. (. Simplified). Phylogey. of Fishes. HAGFISHES:. Living relict group of fishes often considered to be amongst most primitive of vertebrates.. Jawless, poorly developed cranial structures, no ossified vertebral elements.. Notothenioid. Fishes. by: Priscilla Watson-Wynn. Antarctica. Fifth largest continent. The world’s most southern continent. Surrounded by Southern Ocean. 98% covered in ice sheet & 2% barren rock. The Fishes: Vertebrate Success in Water. Evolutionary Perspective. Phylogenetic Relationships. Subphylum Craniata. Skull surrounds brain, olfactory organs, eyes, and inner ear.. Infraphylum Hyperotreti. Fish- multiple fish that belong to the same species. Fishes- multiple fish that belong to different species. “Fish” versus “Fishes”. All . have…. At least one bone in their skeleton. Scales. Scientific Classification-. Class . Osteichthyes. Class . Osteichthyes. includes all bony fishes. . Like all fishes, . Osteichthyes. are cold-blooded vertebrates that breathe through gills and use fins for swimming.. Response of fishes to flow. Gido. and . Propst. 2010. Flow variation in the San Juan River. Flow variation in the San Juan River. 56 m. 3. /s ~2000 . cfs. 14 m. 3. /s . ~. 500 . cfs. Gido. and . Propst. Origin. Position. Anatomy. Ovaries. Testes. Testes in different groups. Structure of ovary. Structure of testes. Cyclic changes in gonads. Intermittent organs. Reproductive strategies. Acknowledgements . coloured. . . Colouration. is one of the most common phenomena found among the fishes.. The enormous range of . colours. and patterns that produced in fishes are generally related to their habits.. Page 39, . text. Precambrian. Phylogeny of the Fishes. The first vertebrates to appear in the fossil record occurred in the late Cambrian Period (. ~. 500 mya). These were jawless armored fishes known as . Prof. Dr. . Mohammad . Hamed. . Bahnasawy. .  . Prof. of fish . biology . Zoology Department. Faculty . of . Science. . Damietta . University. The negative aspects. 1- Poisonous and venomous fishes. Lab 1 . Fish Ecology:. is . the study of the processes influencing the distribution and abundance of fishes, the interactions among fishes, and the interactions between fishes with their environment..