Presentation on theme: "How to Cold- Read a Fish. What is a fish, anyway? Vertebrates Backbone CNS with brain Bilateral symmetry Sexual reproduction Fishes have: Jaws Gills Paired."— Presentation transcript:
How to Cold- Read a Fish
What is a fish, anyway? Vertebrates Backbone CNS with brain Bilateral symmetry Sexual reproduction Fishes have: Jaws Gills Paired fins Scales (usually) Cold-blood (almost always) Fish vs. Fishes
How to memorize 25,000 fish… Dont memorize…read them Take clues from: Body shape Fins Mouth Senses Color/patterns Habitat
Fins on the football Fusiform Paired fins Pectoral fins Pelvic fins Unpaired fins Dorsal Anal Caudal Modified fins
Fish sense Eyes Size Position Nostrils/nares Position Shape Other Barbels Lateral line
Fish mouths Mouth position Point up – surface food and oxygen Point down – prey on or near the bottom Point forward – AKA terminal, chase food Size and shape Inside Teeth – all over Rakers – filtering
Staying out of trouble Armor Spines Skin color Countershading Disruptive coloration Cryptic coloration Silver and red Imitation Schooling
Eco-shapes Rover predators Fusiform, terminal mouth, forked tail, evenly placed fins Lie-in-wait predators Fins far back Surface-oriented Upturned mouth, large eyes, dorsal back
Eco-shapes Bottom fish – flat, camouflaged Rovers – goatfish Clingers – sculpins, clingfishes Flatfishes Rattails Deep-bodied Smooshed, pecs, small mouth, large eyes, spines Eel-like - eely
Habitat is context Individual adaptations may only make sense in the context of a fishs habitat Specific challenges
How to cold-read a fish Body shape Fusiform Flattened Eel-like Deep-bodied Fins Tail shape Pectoral fins Dorsal/anal fins Modified fins Spines? Senses Eyes Nostrils/nares Barbels Mouth Position Size and shape Skin color Silvery/counter-shaded Cryptic/disruptive Eyespots, etc.
Tell me about this fish
What about me?
What about me?
Phantasmagoric Fish Stories Its all about resource partitioning Extreme specialization leads to… Freaks!
Freaky feeders Archer fish Arawana Dusky damsel Angler fishes Gulper eels Electric fishes Cichlids Vege piranhas
Bizarre sex stories The mile-high club Splash tetra Lonely and loving it Functional hermaphrodites Lancets, tripods Transvestites and transsexuals Sneaker males Changing with age, population composition Omega males Deep sea anglers Amazon Molly
We could go on Worlds smallest vertebrate Ice-fishes Anti-freeze in blood Rivulines Eggs to adults in 4 weeks, dead in a year Elephant fishes Huge brains (3%) Tarpon can drown Walking catfish Swimmers surprise Swamp eels Can live out of water for up to 6 months Telescope/tripod Flying fish 30 sec, 1m high, 200m Four-eyed fish Pearlfish