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Fish

Why is my male goldfish trying to fertilize my female?

Male goldfish can be a real nuisance sometimes. When they sense that the female is filled with eggs, they’re going to look for a place to put their fertilization efforts to work. This biological need can be witnessed by simply observing the male and female interacting with each other.

What is the difference between a male&female goldfish?

Females may also have a bulge on one side as breeding season approaches, and their vent, or anal opening, may protrude slightly. Male goldfish often have a thinner, more streamlined body shape than females, with a concave vent and a midline ridge.

Can you keep too many goldfish in the same aquarium?

Most people keep too many goldfish in the same aquarium. Ideally, you want to keep only a single goldfish per 30 gallons of aquarium volume. A greater density will tax a fish tank’s ability to perform biological filtration and promote ammonia problems.

What is the difference between male and female molluscs?

Males have breeding tubercles, while females do not have breeding tubercles. Males are smaller in size, and females are bigger in size. Males a have mid ridge line ,while it is absent in females. The vent of males is concave-shaped and thin, while this vent in females is convex and round in shape.

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Do goldfish get bored in tanks?

If your goldfish is housed inside of a bowl, vase, bio-orb, or tall cylindrical tank, not only are they being housed inadequately, but it also causes boredom. A goldfish in small aquaria will have minimal room to swim and explore.

What is the difference between mollusks and fish?

Most mollusks have one heart as well but cephalopods have 3 hearts. All mollusks, except bivalves, have a unique organ called a radula, which is like a tongue with teeth on it. Fish can have regular teeth, or teeth in their throats, some have beaks, some have none of these.

How long can a Goldfish remember things?

Now, it has been proven that the 3-second memory span thing is a total myth. Goldfish can remember things for much longer than 3 seconds, up to several months in fact.

Do all mollusks have gills?

All mollusks have gills called ctenidia, the terrestrial ones use this type of respiration in a reduced way and breathe through the skin. Most fish have gills but there are lungfish that use modified swimming bladders to breathe. Many fish can breathe through the skin too.

Why are fish and mollusks so similar?

Both fish and mollusks are bilaterally symmetrical animals though. They share a common ancestor more than 560 million years ago, in the Ediacaran period. There are some mollusks, however, which resemble fish in how they swim and look. They evolved to be like this via convergent evolution. They are a family of nudibranch snails called Phylliroe.

What are molluscs classified as?

Molluscs are shellfish that have a hard inedible shell. They are classified into three other subgroups—gastropods or univalves, bivalves, and cephalopods. 1. Gastropods: These molluscs have a single shell. They are also known as univalves.

Can an animal identify a mark by looking in a mirror?

For a tiny fish, the bluestreak cleaner wrasse has raised a big ruckus in the animal world. Key points: The mirror tests whether a non-human animal can identify a mark on their body by looking in a mirror, while touching their body, not the mirror

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Do fish recognise themselves in the mirror?

The study’s senior author, Australian scientist Alex Jordan, believes the fish did recognise themselves in the mirror. But, he said, the act of seeing a reflection doesn’t necessarily equate to higher levels of consciousness and he questioned using the test to define the trait across the entire animal kingdom.

Can a tiny fish teach us how to measure self awareness?

– ABC News A tiny reef fish is the first to pass a classic experiment used to assess self awareness, but the provocative findings have opened up a much larger debate about the way we see the animal kingdom. Skip to main content ABC News Homepage

Can fish be tested for self-awareness?

A tiny reef fish is the first to pass a classic experiment used to assess self awareness, but the provocative findings have opened up a much larger debate about the way we see the animal kingdom. Skip to main content ABC News Homepage SearchLog InLog InMore from ABC

Do goldfish get bored when you leave the tank?

However, they could become bored if they’re not in the tank anymore. Remember, goldfish need lots of stimulation to make sure they’re not getting bored. And if they get bored they may end up becoming depressed. Should You Give Your Goldfish A Tank Mate?

Do goldfish get depressed in an empty tank?

In my opinion a goldfish on its own in a plain undecorated empty tank would get depressed and cause the fish to have a shorter life span.

Is My Goldfish happy or sad?

If your goldfish is happy, it should be a fairly active swimmer, it should respond to you if you come close, it should sleep normal amounts, and it should be more than happy to eat its food. Remember folks, these are simple little fish and they aren’t going to tell you if they are happy or sad. How Do I Entertain My Goldfish?

Are goldfish solitary creatures?

As a matter of fact, goldfish are not solitary creatures. You will often find them in shoals. In a particular study, goldfish exhibited shoaling behaviors. They did foraging and sampled food as a group. During sampling, the goldfish had a reduced food intake which indicates cooperation among them.

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Mollusks and fish are not closely related. Both fish and mollusks are bilaterally symmetrical animals though. They share a common ancestor more than 560 million years ago, in the Ediacaran period. There are some mollusks, however, which resemble fish in how they swim and look.

What is the difference between a Mollusca and a squid?

Mollusques have no bones in their bodies. So octopus are mollusques. But squids have a sort of feather like plastic and cutlass fish have something like a bone. Those are more like a shell inside the body, and it’s like something to rigidify the body.

What is shellfish made of?

Shellfish is simply anything that comes from the sea, not including fish. There are three types of shellfish, mollusks, shellfish and crustaceans. Shellfish consists mainly of shell or exoskeleton (like lobster or shrimp). What are the different types of shellfish? Mollusks are marine or terrestrial animals (like the snail).

Do all molluscs have gills?

All molluscs also have gills, a mouth and an anus. A feature unique to molluscs is a file-like rasping tool called a radula. This structure allows them to scrape algae and other food off rocks and even to drill through the shell of prey or catch fish.

How many species of molluscs are there?

Mollusca is the second largest phylum of invertebrate animals. The members are known as molluscs or mollusks (/ˈmɒləsk/). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species.

Is a cuttlefish a mollusk?

Octopuses, squid, and cuttlefish are all cephalopods, which are a type of mollusk. Other types of mollusk are gastropods (snails and slugs) and bivalves (clams and oysters). They all share a common ancestor.

What animals are in the phylum Mollusca?

Molluscs have more varied forms than any other animal phylum. They include snails, slugs and other gastropods; clams and other bivalves; squids and other cephalopods; and other lesser-known but similarly distinctive subgroups.