Why do many fishes possess defensive fin spines that produce pain?


Many fish species evolved parts of their fins into sharp, spiny, needle-like elements — called fin spines — that function to protect the fish against predators. Such spines have evolved independently in different lineages and are considered evolutionary drivers of fish diversity.

Why do some fish have spines on their fins?

Many fish species evolved parts of their fins into sharp, spiny, needle-like elements — called fin spines — that function to protect the fish against predators. Such spines have evolved independently in different lineages and are considered evolutionary drivers of fish diversity.

Do fish have pain receptors in their fins?

“Fish do feel pain. It’s likely different from what humans feel, but it is still a kind of pain.” At the anatomical level, fish have neurons known as nociceptors, which detect potential harm, such as high temperatures, intense pressure, and caustic chemicals.

Why do fish have dorsal spines?

Dorsal fins. The dorsal fins increase the lateral surface of the body during swimming, and thereby provide stability but at the expense of increasing drag (see also BUOYANCY, LOCOMOTION, AND MOVEMENT IN FISHES | Maneuverability).

Do fish feel pain when they are caught?

The wild wriggling and squirming fish do when they’re hooked and pulled from the water during catch-and-release fishing isn’t just an automatic response—it’s a conscious reaction to the pain they feel when a hook pierces their lips, jaws, or body.

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Why do some fish have spines on their fins?

Many fish species evolved parts of their fins into sharp, spiny, needle-like elements — called fin spines — that function to protect the fish against predators. Such spines have evolved independently in different lineages and are considered evolutionary drivers of fish diversity.

Do fish have pain receptors in their fins?

“Fish do feel pain. It’s likely different from what humans feel, but it is still a kind of pain.” At the anatomical level, fish have neurons known as nociceptors, which detect potential harm, such as high temperatures, intense pressure, and caustic chemicals.

Why do fish fins hurt?

Fish can get hurt a number of ways. Handling them in a net can rip their fins or tails. They can hurt themselves on sharp-edged aquarium decorations. Aggression from other fish, either fighting or fin-nipping, can cause fin injuries.

What are the spines on a fish called?

Dorsal fin Some fish have sharp spines in their dorsal fins which they use to protect themselves against predators.

Do fish have more pain receptors than humans?

Fish do not feel pain the way humans do, according to a team of neurobiologists, behavioral ecologists and fishery scientists. The researchers conclude that fish do not have the neuro-physiological capacity for a conscious awareness of pain. Fish do not feel pain the way humans do.

Why fish do not feel pain Key?

First, behavioural responses to sensory stimuli must be distinguished from psychological experiences. Second, the cerebral cortex in humans is fundamental for the awareness of sensory stimuli. Third, fish lack a cerebral cortex or its homologue and hence cannot experience pain or fear.

How many pain receptors do fish have?

Rubbing an injured area to ameliorate pain has been demonstrated in humans and in mammals. Fifty-eight receptors were located on the face and head of the rainbow trout. Twenty-two of these receptors could be classified as nociceptors, as they responded to mechanical pressure and heat (more than 40 °C).

What does a fish spine do?

A fish’s backbone is also known as its spine. It provides support for the ribs, tail, and body systems.

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Do most fish have spines?

While there are over 33,000 known fish species, they have two things in common: they live in water and have spines. Fish are vertebrates, which means they have backbones. While most fish have a backbone, some don’t. The spine is one of the most vital structural components fish have.

When did fish develop spines?

The evolution of fish began about 530 million years ago during the Cambrian explosion. It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates.

Do dogs feel pain?

Pain Management for Dogs and Cats Dogs feel pain for many of the same reasons as humans: infections, dental problems, arthritis, bone disease and cancer. They also feel discomfort following surgical procedures. Unfortunately, unlike humans, they are unable to speak to us about when and where they hurt.

Do fish suffer after being caught?

After being caught and released by an angler, fish may die for a variety of reasons. The most common causes of death are the physiological stresses caused by the struggle during capture and injuries caused by the hook or the angler. Some fish may die even though they appear unharmed and despite efforts at revival.

When did fish develop spines?

The evolution of fish began about 530 million years ago during the Cambrian explosion. It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates.

What fish has spikes on its back?

Scorpionfish, lionfish, stonefish – these and around 250 other fish are highly venomous and have nasty spikes. Their dorsal fins have been turned into poison stings and they also have spines towards the ends of their bodies.

Is clamped fins good?

Clamped fins does not indicate one specific disease. Instead, clamped fins can indicate a few different problems such as bad water quality or parasites. Therefore, you have to determine the exact problem to treat the fish. Regularly providing a clean, healthy environment for your fish should prevent clamped fins.

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Why do some fish have spines on their fins?

Many fish species evolved parts of their fins into sharp, spiny, needle-like elements — called fin spines — that function to protect the fish against predators. Such spines have evolved independently in different lineages and are considered evolutionary drivers of fish diversity.

Do fish have pain receptors in their fins?

“Fish do feel pain. It’s likely different from what humans feel, but it is still a kind of pain.” At the anatomical level, fish have neurons known as nociceptors, which detect potential harm, such as high temperatures, intense pressure, and caustic chemicals.

What is the purpose of fish fins?

Almost all fish have fins that they use for swimming (locomotion), balance, stability, and steering. A catfish has dorsal, adipose, caudal, anal, paired pelvic, and paired pectoral fins.

Can fish fins cut you?

Handling Your Catch Some fishes have sharp fins or teeth that can cut you. See our Angler Education pages for tips on how to handle different species.

Where are the spines on a fish?

Spines can be present on the dorsal, pectoral, anal and pelvic fins (figure 1). Fishes with fin spines projecting in the horizontal plane (pectoral-fin spines) should increase their body width, whereas those with spines on the vertical axis (dorsal-fin, anal-fin or pelvic-fin spines) should increase in body depth.

What body structure do fishes have to protect themselves from danger?

All fish have external appendages called fins. Like human limbs, fins provide fish with the ability to balance, steer, propel, and protect itself. Fins are either single, along the centerline of the fish such as the dorsal fin, anal fin, and tail fin; or paired, like the pectoral fins and pelvic fins.

Leigh Williams
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