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The Fish Lateral Line
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What is the lateral line?
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What is the lateral line?
Superherostuff.com
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What is the lateral line?
Superherostuff.com Spider Man = Spider Sense
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What is the lateral line?
Superherostuff.com roadtripusa.com Spider Man = Spider Sense
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What is the lateral line?
Superherostuff.com roadtripusa.com Spider Man = Spider Sense Fish Man =
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What is the lateral line?
Superherostuff.com roadtripusa.com Spider Man = Spider Sense Fish Man = Fish Sense?
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What is the lateral line?
Superherostuff.com roadtripusa.com Spider Man = Spider Sense Fish Man = Fish Sense?
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What is the lateral line?
Superherostuff.com roadtripusa.com Spider Man = Spider Sense Fish Man = Lateral Line
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What is the lateral line?
A special sense a fish has that can sense the movement in the water around them! roadtripusa.com
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What is the lateral line?
A special sense that fish have that can sense the movement in the water around them! Why would they want to do that? Because they can. roadtripusa.com
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What is the lateral line?
A special sense that fish have that can sense the movement in the water around them! Why would they want to do that? Because they can. Water is denser than air Can tell when it “bumps” into them roadtripusa.com
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What is the lateral line?
A special sense that fish have that can sense the movement in the water around them! Why would they want to do that? Because they can. Water is denser than air Can tell when it “bumps” into them When they can’t see roadtripusa.com
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What is the lateral line?
A special sense that fish have that can sense the movement in the water around them! Why would they want to do that? Because they can Water is denser than air Can tell when it “bumps” into them When they can’t see Sometimes its dark Sometimes they have no eyes roadtripusa.com
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What is the lateral line?
A special sense that fish have that can sense the movement in the water around them! Why would they want to do that? Also: Staying still and sensing the world around them roadtripusa.com
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What is the lateral line?
A special sense that fish have that can sense the movement in the water around them! Also: Staying still and sensing the world around them Important for feeding! roadtripusa.com Tim Babb
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Overview Who has a lateral line? What can it sense?
What does it look like? How do scientists study it? roadtripusa.com
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Overview Who has a lateral line? What can it sense?
What does it look like? How do scientists study it? roadtripusa.com
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Who has a lateral line? Yellow Perch Lake Trout Largemouth Bass
Montana Hunting and Fishing Journal UW Sea Grant Conn. DEC Yellow Perch Lake Trout Largemouth Bass
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Who has a lateral line? EVERY FISH Yellow Perch Lake Trout
Montana Hunting and Fishing Journal UW Sea Grant Conn. DEC Yellow Perch Lake Trout Largemouth Bass EVERY FISH
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Overview Who has a lateral line? What can it sense?
Every fish What can it sense? What does it look like? How do scientists study it? roadtripusa.com
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Overview Who has a lateral line? What can it sense? Every fish
Enemies moving Friends moving Food moving Obstacles roadtripusa.com
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What can it sense? Enemies
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What can it sense? Fish can sense that a bigger fish
Enemies Fish can sense that a bigger fish swam by and swim away!
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What can it sense? Friends Schooling fish can sense that they are near their school, even if they cannot see them.
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What can it sense? Friends Schooling fish can sense that they are near their school, even if they cannot see them.
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What can it sense? Sensing food: When it is dark To sit and wait
To maximize efficiency Aquaworld
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What can it sense? The Sculpin Moves – to find a spot
Food The Sculpin Moves – to find a spot Sits – senses with lateral line Moves again if it finds nothing Doesn’t have to see the prey to know its there
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What can it sense? Obstacle Avoidance First, a quick lesson in fish hydrodynamics Water is displaced off of head then sucked in by tail (water movement) FISH Hassan et al. 1998
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As an obstacle is approached
What can it sense? Obstacle Avoidance As an obstacle is approached scan of Hassan 218 Water flow is disrupted from normal pathway. FISH FISH Hassan et al. 1998
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What can it sense? The blind cave fish Lives in completely dark caves
Obstacle Avoidance The blind cave fish Lives in completely dark caves Has no eyes How does it avoid obstacles?
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What can it sense? The blind cave fish Lives in completely dark caves
Obstacle Avoidance The blind cave fish Lives in completely dark caves Has no eyes How does it avoid obstacles? The lateral line!
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Action Video of Obstacle Avoidance
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Overview Who has a lateral line? What can it sense?
Every fish What can it sense? Everything that moves in water What does it look like? roadtripusa.com
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Overview Who has a lateral line? What can it sense?
Every fish What can it sense? Everything that moves in water What does it look like? What are the components? Where is it located? roadtripusa.com
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What does it look like? First, a term:
Neuromast: a big word for the little jellybean looking structures that make up the lateral line.
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What does it look like? Neuromast
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What does it look like? Neuromasts can be located on the outside of the fish Or inside little canals under the scales Mogdans and Bleckmann 2001 Close up of a scale with an entrance to the canal
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What does it look like? Neuromasts can be located on the outside of the fish Or inside little canals under the scales Side view of canal
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What does it look like? Why put the neuromasts under the skin?
It’s like covering your ears
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What does it look like? Fish that live in streams have more canals,
Finnish Fly Fishing Magazine Fish that live in streams have more canals, because the water would overload the neuromasts
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What does it look like? Fish that live in calmer environments have more neuromasts on the outside of their body
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What does it look like? Also note the position, not just on side of body
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What does it look like? Also note the position, not just on side of body
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What does it look like?
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Overview Who has a lateral line? What can it sense?
Every fish What can it sense? Everything that moves in water What does it look like? Location and type varies How do scientists study it? roadtripusa.com
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Overview Who has a lateral line? What can it sense?
Every fish What can it sense? Everything that moves in water What does it look like? Location and type varies How do scientists study it? roadtripusa.com
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How do scientists study it?
Scientists are detectives. They have ideas and follow clues But they need to approach the idea scientifically
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How do scientists study it?
Scientists are detectives. They have ideas and follow clues But they need to approach the idea scientifically They must eliminate variables (possible situations)
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How do scientists study it?
Blinding the fish Lets scientists eliminate vision from fish’s choice Disabling the lateral line Done by use of chemicals or severing nerves Lets scientists see what happens when fish cannot use the lateral line
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How do scientists study it?
examples The Stargazer Stimulated by fish swimming Even when dark
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How do scientists study it?
examples Blind fish schooling Pitcher et al 1976
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The End Dear frog and fish, or newt and shark,
you needn’t worry when it’s dark; you’ll escape or dine just fine, Svenning with your lateral line. From: The Mechanosensory Lateral Line
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