Saturday, July 27, 2019

Why do dead fish float upside down?

Why do dead fish float upside down?

Like a living creature, gases build up inside a fish's body when it dies, and this keeps it afloat in the water. these gases collect mainly in the abdominal cavity, which is on the underside of the fish. When this happens, the lighter, gas-filled abdomen becomes buoyant and the more compact back forms the center of gravity, with the result that the fish is turned upside down. It is only when decomposition is further advanced that the gases are released. and the fish sinks.




Do fish sleep?

Do fish sleep?

Although fish do not have eyelids, they regularly have short naps, just like the higher vertebrates. Some sleep during the day, others at night. Sleeping fish hide in caves, crevices or coral canyons, lying on their sides or surrounding themselves with a coat of slime, which also helps to protect them from predators. As they sleep, alert. However, they never completely unconscious. Electroencephalograms (EEGs) taken of the fish brains have shown that resting fish do not have phases of deep sleep. Some fish even manage to continue swimming slowly while they are asleep.



How does a fish's sixth sense works?

How does a fish's sixth sense works?

Fish have sensory equipment that can detect impulses caused by movements in the water. This is often referred to as a fish's sixth sense. Because the sense organ responsible for this ability runs along the body, from the eye to tailfin, it is known as the lateral line consists of small pores - which often appear as a pale line along a fish's body - that lead to canals beneath the skin lines with sensory cells called neuromasts. These cells enable fish to sense even the smallest vibrations and movements in the water, which why they never swim into the well of a fish tank, and why they can always manage to find their way around, even in the murkiest water. This sense also gives fish some idea of the size of the creatures that may be lurking in their vicinity, important for predator and prey alike. Sharks, for example, use this ability to locate nearby prey.


Do fish drink water?

Do fish need to drink?

The answer is yes and no - saltwater fish drink, freshwater fish do not. The reasons are all down to a matter of physics and a process knows as osmosis.
               When two fluids of differing concentrations are separated by a membrane - in this case, the skin of the fish - water always flow towards the more highly concentrated solution. The body fluid of freshwater fish is more highly concentrated than the surrounding water. Therefore water is absorbed into the body through the skin and gills and the fish must actively excrete water, otherwise, it will eventually explode. The opposite is true for saltwater fish. In their case, the surrounding water is more highly concentrated and draws fluid out of the fish. This means the saltwater fish must actively take in water to avoid drying out. They take in water through their mouth, mucous membranes and gills. The salt is excreted by the gills before reaching the body.

Friday, July 26, 2019

Are fish deaf and dumb?

Are fish deaf and dumb?

Fish are anything but dumb. Squirrelfish communicate with clicking sounds, wrasse grunt, gurnards growl and male dumb fish have special muscles around their bladder which produce a drumming sound when contracted rapidly. Most remarkable of all, when herrings fart it has nothing to do with their digestion, but everything to do with communication. In order to have a conversation, they swallow air which they expel through the anal orifice in their gas bladder. In this way, the fish can produce notes extending over more than three octaves at frequencies of between 1.7 and 22 kHz. they can hold each note for almost eight seconds.
            since fish can make such a range of noises, it seems only logical to assume that they can hear. They do so through their inner ear which is connected to the air bladder by what is known as the Weberian apparatus then transmits the sounds to the inner ear - in a similar fashion to the way the auditory ossicles function in mammals. 
Wrasse native to the western Pacific Ocean communicates by making grunting noises.

Sunday, July 14, 2019

How do elephants chew?

How do elephants chew?

Elephants eat by grinding tough plants matter back and forth between four massive molars- one on top and one on the bottom at each side of the mouth. These are rasped away over many years and replaced six times throughout the elephant's life. As each tooth is gradually worn down, the root is reabsorbed and the whole tooth is eventually replaced by a new one developing behind it. If an elephant is still alive when its last tooth wears out, it can no longer chew its food and will die of starvation. In fact, this rarely happens in the wild, since the animals don't usually live to such a great age.



What is the lifespan of an elephant?

How long do elephants live?


These magnificent pachyderms can live to an age of 70 years. they live in herds of about 10 cows and they are young, led by an older matriarch. Males are excluded from the herd as soon as they reach sexual maturity. Young bull elephants will often get together to form bachelor herds, but will only approach females for breeding purposes.



Why do dead fish float upside down?

Why do dead fish float upside down? Like a living creature, gases build up inside a fish's body when it dies, and this keeps it afloa...