Interesting Fish Facts And Secrets Of Fish In General

4 Interesting fish facts to Know About Freshwater Fish

1.Do you know that the blood of freshwater fish has a higher salt concentration than their environment.

2.There is no need for freshwater fish to drink water, because of the large quantity of water that flows in across their skin.

3.How do freshwater fish get rid of that excess water? Their kidneys produce large amounts of dilute urine that rids their body of the excess water.

FYI: The body’s goal of human and all living organisms including fish is to maintain a constant concentration of  sodium. It does this  in part, by altering  the amount of water present, either by getting rid of any excess amount or holding on to just the  amount needed via the kidneys.

4.Does salt leave the body also along with water? yes, salt also tends to leave the body of the fish and diffuse into the surrounding water. However, in freshwater fish, the gills expend a considerable amount of energy actively accumulating and absorbing salt from the river, pond, pool, lake or aquarium.

Salt Water Fish – 2 Interesting Facts To Know
1.If the water environment is saltier than the body of the fish, water will tend to diffuse outward from the body of the fish and leave them dehydrated.

2.If the water environment is less saltier than the blood of the fish, water will diffuse inward and cause the fish to be waterlogged.

Angler Fish – The Angler Fish Mysterious Secrets To Survival and Reproduction 

The Angler fish inhibits a unbelievably challenging environment – a depth of more than 1000 feet below the surface of the ocean, an unfriendly icy bone-chilling temperature and an inky black expanses of the deep sea. The question is, how does it survive,day-to-day in such a hostile environment as this one? Not only are food and mates widely dispersed and in short supply, but this amazing fish choose to exist in an habitat where not even the the slightest glimpse of sunlight penetrates.

It’s amazing how this fish solve the problems of eating and reproducing in this deep bottomless pit! With the aid of an organic light bulb – an organ packed with bioluminescent bacteria, located between its eyes and above its gaping sharp-toothed, proportionately gigantic mouth. As it slowly wonders around in the ocean abyss – an indescribably pitch of darkness, a pale blue glow comes from its “bulb”, which tends to attract small passerby, such as a hatchetfish. As these curious visitors draw closer to investigate the light source, they may wind up in its wide opened mouth.
Anglerfish - Secrets To Survival and Reproducing
According to marine biologist researchers, the female Angler fish uses this “glowing light” source,possibly aided by faint but alluring odors, to attract male suitors. The males she succeeded in attracting becomes permanent appendages by literally attaching on to her side or belly with specialized, viselike mouth parts. Measuring only about one-twentieth of her size, the male angler fish is dwarfed by the female.

While the male stayed literally clamped to her, his blood system actually fuses with hers, and he receives all his nourishment from her. Not before long, his sperm unites with her eggs. It is believed that probably when hormone surges in her body it coordinates the simultaneous release of her eggs and the male’s sperm.

Marine biologist find the symbiosis in some Angler fish species so complete that the male is reduced to nothing more than a pair of testes attached to the more larger translucent female. See picture above; identify the two very small males attaching to the much larger female, literally becoming a part of her.

How Does A Fish Breathe Efficiently In Water?
Fish Use Gills To Extract Oxygen From Water. Illustrations below show how a fish’s gills – flaps, capillaries and countercurrent flow allow a rich creation of oxygen from oxygen-poor water.

A- Fish

B – Mouth Cavity

C - Gills

D – Gas Exchange

E -Counter- Current Exchange
Fish Facts For Kids – Facts About Fish Ability to Hear and Feel

There are several interesting fish facts for kids and even parents to be aware of when it comes to fish and their ability to hear or feel. The first interesting fact to know is that even if a fish is blind it still wouldn’t be that easy for you to simply place your hands in an aquarium or any other water and catch it without that fish trying to escape. You might ask yourself the question, how will it know that I am trying to catch it when it cannot see or hear? The answer to this is quite simple. The moment you place your hand in the water that fish will sense or detect your presence and will try to move away.

The second fish fact is that, although a fish has no external ears it can still hear. Fish have what is known as vibrations mechanorecption (hearing and touch) system as well as a lateral line system that actually allow them to feel their environment. Sound vibration easily transmit from the water through the body of a fish to its internal ears.

The lateral line receives signals transmitted in a sequence, and provides the fish with much more information such as feeling the presence of other fish around it, and the detection of prey in close range.

The lateral line is made up of a series of microreceptors called neuromasts which are arranged in network along the head and body. Rows of neuromasts appear on the lateral surface(on the side) of fishes skin. In brief, the lateral line system serves to detect movements and pressure changes in the surrounding water.

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