1、.1Tilapia External and Internal AnatomyMarch 11, 2014.2OBJECTIVE:Tilapia;Dissecting equipment (scissors, forceps, dissecting pan, etc.);Ruler.To become familiar with the gross anatomical structures of tilapia.SUPPLIES:.3HeadTrunk TailPROCEDURE:PART 1: EXTERNAL ANATOMYBody shape Streamlined, or fusif
2、orm, reducing the drag Body regions Head, Trunk, and Tail .4ExternalAnatomy.5 Scales cycloid scales Thin Oval Overlapping Used for speed Reduce friction Contain growth rings (circuli).6 Fins Used to maintain position, move, steer, and stop. Composed of fin rays (provide support) Unpaired Fins Dorsal
3、 keep fish upright Anal keep fish upright Caudal (tail) thrusts fish through the water and assists in steering Paired Fins Pectoral behind the gills (act as brakes; side to side motion) Pelvic - below and behind the pectoral fins (up and down motion).7 Gills Take in oxygen and give off carbon dioxid
4、e Opercula hard plate that covers the gills Gill arches 4 arches in tilapia Gill rakers strain unwanted particles from the water Gill filaments - where gas exchange takes place.8 Lateral Line allows fish to sense change in water pressure Allows fish to sense movement in water Avoid objects in their
5、path Sense chemicals in the water (attracting a mate)Lateral Line.9 Mouth Used in place of hands to feel objects Nares Nasal openings in the snout Contain smell receptors Sense of smell.10 Eyes Eyes are on the sides of their heads No eyelids Thick cornea Large pupils which allow light to enter Retin
6、as have both rods and cones (can see in dim light and color).11The shapes of tilapia genital papilla.12Male tilapiaFemale tilapiaGenital papillaAnusUreterAnusOviductVas deferens and ureter.13PART 2: INTERNAL ANATOMYu Circulatory system Heartu Reproductive system Gonadu Urinary system Kidneyu Digesti
7、ve system u Respiratory system GillsLiverGall bladder Intestineu Immune system Spleech.14.15INTERNAL ANATOMY.16u Dissecting procedure.17.18.19u Circulatory system Heartpericardial cavity.20u Reproductive system Gonad.21u Urinary system Kidney Kidney .22u Digestive system Liver .23 Gall bladder.24 Intestine.25 IntestineDark peritoneum.26 Spleech u Immune system Spleech.27u Respiratory system Gills Gills.28 Swim bladder The swim bladder is located above the peritoneum (retroperitoneal) and below the kidney. In tilapia, the swim bladder is .29ReportThank you !
