Chapter 12 Marine Fishes
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1 Chapter 12 Marine Fishes
2 Marine Protochordates Phylum: Chordata (nerve cord) Subphylum: Protochordata first chordates/primitive Primitive species of marine vertebrates Do not have advanced features (backbone) Sea Squirt (Tunicate): Aquatic Larva have a nerve chord and gill slits disappears in mature organisms Lancelet: Aquatic Have a nerve cord as adults
3 Marine Fishes Phylum: Chordata All chordates have: notochord, pharyngeal slits, postanal tail, nerve cord Subphylum: Vertebrata All vertebrates have: nerve cord, closed circulatory system Most vertebrates in the ocean are fishes Fish: Aquatic Have scales, fins, gills 3 Classes of Fishes: 1.Agnatha (jawless fishes) 2.Chondricthyes (cartilaginous fishes) 3.Osteichthyes (bony fishes)
4 Agnatha: Jawless Fishes First fish to evolve very primitive. No jaw, no true backbone (notochord). Bodies are long, flexible. Cartilaginous skeletons. 2 types of jawless fish: 1. Sea Lamprey 2. Hagfish
5 Agnatha: Jawless Fishes Sea Lamprey parasitic Petromyzon marinus attaches to host using a sucking disc and uses rough tongue to bore hole into host. Found in estuaries along Atlantic coast. Hagfish- scavenger Myxine glutinosa Uses sharp teeth in round mouth to burrow into dead or dying organisms. Atlantic and Pacific species.
6 Chondricthyes: cartilaginous fishes Nearly 1000 species. Skeletons are made of cartilage (flexible tissue like our ears) Placoid scales (very rough, tooth-like) NO gill cover (operculum) Visible gill slits, spiracles Water enters through spiracles and then over gills Rigid fins Ventral mouths Live births for most
7 Chondricthyes: skates and rays Rigid fins help to provide lift when swimming. Have over-developed pectoral fins (like wings). Bottom-dwellers.
8 Chondricthyes: skates and rays Rigid fins help to provide lift when swimming. Have over-developed pectoral fins (like wings). Bottom-dwellers.
9 Chondricthyes: Skates (Myliobatiformes) Pelvic fins have 2 lobes Thick tail, no stinging spine Enlarged scales along the back. Rays (Rajiformes) Pelvic fins have 1 lobe Thin, whip-like tail with a stinging spine. No scales along midline of back.
10 Chondricthyes: reproduction in skates & rays Internal fertilization. Skates have external development embryos develop in an egg casing (oviviparous). Mermaid s Purse Rays have internal development - give birth to live young (viviparous).
11 Chondricthyes: sharks 400+ species of sharks. Filter feeders (basking shark) and predators (great white).
12 Chondricthyes: shark behavior Streamlined body allows for quick swimming. Several rows of sharp teeth help predators feed. Rows are constantly being replaced. Swimming: shark breathe more efficiently when swimming (ram breathing) moves water over gills. Resting sharks breathe by buccal pumping. Very large, oily liver for buoyancy.
13 Chondricthyes: shark reproduction Internal fertilization. Claspers in males transfer sperm into the female. Most have internal development; give birth to live young (viviparous)
14 Chondricthyes: sharks SHARKS HAVE 7 SENSES: 1. Lateral line: a sensory organ that helps sharks pick up vibrations and pressure changes in water. Runs length of the body. 2. Scent: can smell some things 10,000x better than us Can smell a drop of blood from far away hundreds of meters. 3. Sight: excellent eye sight. can see under water from 0-50 meters.
15 Chondricthyes: sharks 4. Ampullae of Lorenzini: Nerve receptors in tiny pores on head Sense weak electrical charges generated by the muscles of other fish, prey in water. 5. Hearing: Very sensitive works over far distances. Ears are small opening on top of head.
16 Chondricthyes: sharks 6.Taste: Tastebuds on palate determine if things are edible if yes, it is eaten, if not, it is spit back out. 7.Touch: curiosity will often lead to sharks nudging things with their snout.
17 Discovery: Nat Geo: com/video/worldsdeadliest/deadliest-sharksenses PBS: /
18 Osteicthyes: Bony Fishes More than 95% of all fish belong to this class. Bony skeleton Gills are covered - operculum Slimy scales, loosely attached to skin. Swim using fins, paired pectoral and pelvic fins
19 Osteicthyes: Bony Fishes Ray-finned Most fish are this type Fins are supported by bony structures called rays. Lobe-finned Fins are long, fleshy, muscular, supported by central core of bones. Thought to be ancestors of amphibians
20 Osteicthyes: Bony Fishes Eye: used for sight; bulges out so that it can take in as much light as possible to see more, one on each side of head for wide field of vision. Fins: used to move through water. Nekton: fish that can swim (plankton can t swim) Paired fins are attached to muscles - movement. Single fins stabilize Mouth: used for feeding; position of mouth can tell you what type of feeder it is.
21 Osteicthyes: Bony Fishes Nostrils (nares): for smelling; nerve endings inside detect chemicals in the water. Lateral Line: sensory cells along the side of the fish receive sound waves and send electrical impulses to brain. Operculum: flap of tissue that covers the gills; opens and closes every time a fish breathes.
22 Fish Respiration Gills are covered by the operculum. Water flows over gills as fish opens mouth and swims. O 2 diffuses from the water into the blood.
23 Osteicthyes: Bony Fishes Gills: used for respiration. Heart: pumps blood through fish; 2 chambers. Liver: removes toxins from blood. Stomach, intestine: digestion of food. Kidney: filters out waste from blood. Swim bladder/air bladder: gasfilled sac inside fish; fills with air to float; deflates to sink. Ovary: reproductive organ.
24 Fish Reproduction Most fish reproduce sexually, and fertilize their eggs externally (sharks do this internally). Spawning: the process of fertilizing eggs. Baby fish are called FRY.
25
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