How to Cold- Read a Fish. What is a fish, anyway? Vertebrates Backbone CNS with brain Bilateral...
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Transcript of How to Cold- Read a Fish. What is a fish, anyway? Vertebrates Backbone CNS with brain Bilateral...
![Page 1: 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.](https://reader036.fdocuments.us/reader036/viewer/2022062318/55156ca355034674578b4e47/html5/thumbnails/1.jpg)
How to Cold-Read a Fish
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What is a fish, anyway?
VertebratesBackboneCNS with brainBilateral
symmetrySexual
reproduction
Fishes have:JawsGillsPaired finsScales (usually) Cold-blood
(almost always)Fish vs. Fishes
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How to memorize 25,000 fish…Don’t memorize…read
themTake clues from:
Body shapeFinsMouthSensesColor/patternsHabitat
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Fins on the football
Fusiform
Paired finsPectoral finsPelvic fins
Unpaired finsDorsalAnalCaudal
Modified fins
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Fish senseEyes
SizePosition
Nostrils/naresPositionShape
OtherBarbelsLateral line
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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
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Staying out of trouble Armor Spines Skin color
Countershading Disruptive coloration Cryptic coloration Silver and red Imitation
Schooling
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Eco-shapes
Rover predatorsFusiform, terminal
mouth, forked tail, evenly placed fins
Lie-in-wait predatorsFins far back
Surface-orientedUpturned mouth,
large eyes, dorsal back
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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
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Habitat is context Individual adaptations
may only make sense in the context of a fish’s habitat
Specific challenges
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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.
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Tell me about this fish
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What about me?
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Me?
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What about me?
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And us?
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Curveballs
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Phantasmagoric Fish StoriesIt’s all about resource partitioningExtreme specialization leads to…
Freaks!
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Freaky feeders
Archer fishArawanaDusky damselAngler fishesGulper eelsElectric fishesCichlidsVege piranhas
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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
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We could go on World’s 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 Swimmer’s 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