The Shape Of A Fish's Caudal Tail Can Tell You A Lot About How Fast The Fish Moves! A Rounded Tail Is

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

The wonderful Glass Octopus. Living at depths of around 3000 ft and only being about a foot long, these strange little creatures are rarely seen by scientists.

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There are three morphologies of dorsal fins: nearly divided, continuous, and clearly divided.

Ichthyology Notes 1/?

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/?

hi

what's this one cause I have questions

1; is it edible

2: fun facts about it

THAMK YOU

That is a flying gurnard (Dactylopterus volitans)!

To answer your first question, they are edible! They're steadily becoming a more popular food choice because they have a relatively low oil content.

The first thing you might notice about this species is their very large pectoral fins. It's believed that their primary use is to scare off predators. Often the fish rest on the seafloor with the large fins tucked in, only displaying them when threatened. Additionally, they have finger-like segments of their pectoral fins which they use to walk across the sea floor.

These fish can also make noises! Using their swim bladder and jaw, they can make a grunt-like sound believed be used to scare off predators or communicate with each other.

How about the Port Jackson and its adorable smile! I think more people should know about it!

Love your blog! 🦈💖

Thank you so much!

Port Jackson Shark // Heterodontus portusjacksoni

These cute sharks grow to be approximately 1.65 m (5.4 ft) and are found exclusively in the waters of southern Australia. The conservation status for these sharks is unknown, but their eggs have a high mortality rate (only about 11-22% survive) because of high predation.

Unlike a lot of sharks, the Port Jackson shark doesn't have a mouthful of sharp, pointy teeth. They have a front row of small, pointed teeth that lead to wide, flat teeth in the back. These teeth are handy for catching and then breaking the shells of mollusks and crustaceans.

I'd love some lemon shark facts 💛

Lemon Shark or Negaprion brevirostris

They get their name from their yellowish brown coloring. Lemon sharks, unlike the lone-shark stereotype, enjoy hanging out in groups! They even have preferred individuals to hang out with!

Lemon sharks are also one of the most well-understood shark species and this is because they do well in captivity. Additionally, most of our knowledge of shark physiology and biology stems from studies of lemon sharks!

Unfortunately, this species is nearly threatened; this is mostly due to overfishing. They're not only caught as bycatch, but are a target for some fisheries. Their meat, skin, and squalene are used for human consumption. It's estimated that between 70-90% of shark squalene harvested each year is used in cosmetics. (Make sure to do your research before buying makeup). To harvest the amount of squalene used for our consumption, almost 3 million sharks are killed every year. But there's a great new alternative source that's gaining traction: olives!

gamer

(source: squidpastry on iNaturalist)