protectoursharks

[protectoursharks]

misread your username as "prosecute our sharks" and now I'm wondering what crimes our sharks have committed. personally I think they'd go for vandalism (yummy internet wires)

My first instinct is organized crime, and I think that would make a great movie

[protectoursharks]

Do salmon have cycloyd or ctocloyd scales?

Salmon have cycloid scales!

[protectoursharks]

^what he said

[protectoursharks]

I hope none of you disappear in the coming days. Seriously don't do anything that can't be undone.

[protectoursharks]

reblog to join a school of fish with prev

[protectoursharks]

There are four types of fish scales!

Cycloid scales are thin, overlap, and flexible. They're found on primitive teleosts (like minnows and carp).

Ctenoid scales have small, backwards pointed scales (known as cterns) make the fish more hydrodynamic and faster. They're found on Advanced Ctenoids (like perch and sunfish).

Ganoid scales are thick, diamond-shaped, and mostly non-overlapping. They're found on Chondrostei (like sturgeons and paddlefish).

Placoid scales are spikey and tooth-like with nerves. These are found on Chondrichthyes (like sharks and rays).

Ichthyology Notes 3/?

[protectoursharks]

There are four types of fish scales!

Cycloid scales are thin, overlap, and flexible. They're found on primitive teleosts (like minnows and carp).

Ctenoid scales have small, backwards pointed scales (known as cterns) make the fish more hydrodynamic and faster. They're found on Advanced Ctenoids (like perch and sunfish).

Ganoid scales are thick, diamond-shaped, and mostly non-overlapping. They're found on Chondrostei (like sturgeons and paddlefish).

Placoid scales are spikey and tooth-like with nerves. These are found on Chondrichthyes (like sharks and rays).

Ichthyology Notes 3/?

[protectoursharks]

These guys can grow over 1 meter (3.3 ft) long! The size of the scales vary between species. The species mentioned in my post usually have sales around 2 cm (0.79in) long.

And I will definitely continue this as a series, I'm glad everyone else enjoyed it as much as I did!

The body shape of a fish can tell you a lot about it! It can tell you where they like to hang out, how they hunt, what they eat, and more!

Let's use the Asian Arowana (Scleropages formosus) as an example!

Based off the rounded caudal fin (the "tail"), this fish is not a very fast swimmer

Having the dorsal fin and anal fin right near the end of the fish's body suggests it is an ambush predator

The flat head suggests it hunts at the surface

The upturned, large mouth suggests it catches its prey from below

Arowana are ambush predators that hunt at the surface!

They don't need to go very far very fast, hence the rounded caudal fin (which is the slowest moving fin)

Having posterior dorsal and anal fins are a common trait amongst ambush predator

They primarily hunt at the surface! They will sit near the surface and grab small fish, bugs, crustaceans, and even occasionally a bird!

4. Fish that catch their prey from below sometimes do it via suction. They'll open their large mouth, and as the water gets sucked in, so does anything in the water. And the larger the mouth, more water will more quickly fill into the mouth, catching larger and faster prey

[protectoursharks]

opinion on octopi? I love them lol best squishy bois

They are definitely one of my favorite marine creatures!

Grimpoteuthis or Dumbo Octopus

Here are some of my octopus posts: x x x x

[protectoursharks]

Happy Halloween from the Long-nose Chimera ZERO!!!

[protectoursharks]

happy hallowing you can take TWO pieces

[protectoursharks]

Apparently the Congo river is deep enough that there are several species of fish with cavedwelling adaptations (near-total to total blindness, loss of pigmentation, etc) because light doesn't reach where they live. the fuck

[protectoursharks]

PLEASE VOTE. IT MATTERS.

[protectoursharks]

Hiii!

I'm like a week new to Tumblr- I can't figure out how to sort through content well, so you've probably posted about this before

What do you know about sea slugs?? Like particularly interesting ones! I love them and wanna hear your description!!

Here are some of my past nudibranch posts: x x x

One of my favorite nudibranchs is the Sap-sucking sea slug (Cyerce elegans)!

The large leaf-looking parts are known as cerata and help the nudibranch "breathe". They can also be released to use as a distraction if the animal feels threatened!

The species has many color variations, from nearly transparent to red or brown! The color is dependent on the environment in which the species is found; these nudibranchs have coloration that matches the local algae that they eat. This helps them stay camouflaged while they're eating!

[protectoursharks]

how do the anal and dorsal fins near the end of its body mean that it's an ambush predator? what function do they have?

It's theorized that it gives the illusion the predator is further away from prey, so the prey is more likely to swim closer making it easier for the predator to grab its prey! x

[protectoursharks]

The body shape of a fish can tell you a lot about it! It can tell you where they like to hang out, how they hunt, what they eat, and more!

Let's use the Asian Arowana (Scleropages formosus) as an example!

Based off the rounded caudal fin (the "tail"), this fish is not a very fast swimmer

Having the dorsal fin and anal fin right near the end of the fish's body suggests it is an ambush predator

The flat head suggests it hunts at the surface

The upturned, large mouth suggests it catches its prey from below

Arowana are ambush predators that hunt at the surface!

They don't need to go very far very fast, hence the rounded caudal fin (which is the slowest moving fin)

Having posterior dorsal and anal fins are a common trait amongst ambush predator

They primarily hunt at the surface! They will sit near the surface and grab small fish, bugs, crustaceans, and even occasionally a bird!

4. Fish that catch their prey from below sometimes do it via suction. They'll open their large mouth, and as the water gets sucked in, so does anything in the water. And the larger the mouth, more water will more quickly fill into the mouth, catching larger and faster prey

[protectoursharks]

The shape of a fish's caudal tail can tell you a lot about how fast the fish moves! A rounded tail is the slowest and a lunate tail is the fastest! The lunate tail has the most optimal ratio of high thrust and low draw, making it the fastest.

Ichthyology Notes 2/?