UNIVERSITEIT GENT Fish anatomy Prof Dominique Adriaens Dept of Biology K.L Ledeganckstraat 35, B-9000 Gent dominique.adriaens@ugent.be are Tishes? Petromyzontiformes (lampreys) Holocephali (chimaeras) Chondrichthyes (cartilaginous fishes) GNATHOSTOMATA VERTEBRATA CRANIATA What (sharks) Batoidea (rays) Actinopterygii (ray-finned fishes) Osteichthyes CePA Biology Selachii of Aquatic Organisms Sarcopterygii (lobe-finned fishes) Fish anatom ¢ External morphology ¢ Anatomy — integumentary system — skeletal system — muscular system — nervous system — vascular system — digestive system — respiratory system — excretory system — genital system — endocrine system Chondrichthyes -— cartilaginous fish Squalus acanthias — spiny dogfish | Osteichthyes — bony fish Perca fluviatilis— perch 7/77 ia UNIVERSITEIT GENT Squalus acanthias ¢ Body regions — head — trunk Tail Caudal fin Interbranchial septum Spine Spiracle Posterior dorsal fin Lateral line Spiracular valve — Naris Mouth Labial pocket Pharyngeal slits FIGURE 3.13 Pectoral fin External features of the shark in left lateral view Pelvic fin Ma External morphology - shark ¢ Head parts Hexanchus đríseus ¢ spiraculum i di - (sometimes 6-7) gill slits Caudal fin Anterior dorsal fin Interbranchial septum Spine Spiracle Posterior dorsal fin Lateral line Spiracular valve => HC — Mouth Labial pocket Pharyngeal slits FIGURE 3.13 External Biology Pectoral fin features of the shark in left lateral view of Aquatic Organisms Fish anatom K Tail os Trunk ! Head bu — ~~ Pelvic fin External morphology ¢ Head ‘openings’ ¢ Sensory openings À Trunk Ỷ Head A - shark Interbranchial septum Spiracle Spiracular valve Mouth Labial pocket Pharyngeal slits FIGURE 3.13 Pectoral fin External features of the shark in left lateral view Biology of Aquatic Organisms Fish anatom ¢ Trunk openings ¢ Trunk appendices — cloaca — fins ¢ anus ¢ dorsal fin (- or + spines) ¢ genital pore ¢ paired fins ¢ urinary yP pore — | from the viscera | | Head Ôn cản —== Bà SE HH Vị: =ˆ TT ali unk ˆ— ie pee : aa i BI eT e a Caudal fin Spine Spiracle Posterior dorsal fin Lateral line Spiracular valve Eye “4-7 : Naris > Caudal fin : Spine Spiracular valve — Z - Pelvic fin a Integumentary system Placoid scales — skin ¢ epidermis — epithelial structure — non-vascularised — chromatophores Placoid scales — enameloblasts Epidermis » enameloid layer of placoid scales dermis ' Pi f — connective tissue — vascularised — chromatophores — odontoblasts dentine layer of placoid scales ib py On c^ MA Mg tay t< perks i oh it Leta tee ƒ Ti: bt ae? fad pee