Description Contrary to some popular thinking, fish do not produce a lot of eggs because so many are eaten by predators. More from this issue. Science Notes. Jan That depends on the species, the cane toad can lay up to 25, eggs a year, most species lay several hundreds tot a couple of thousands of eggs.
Some frogs rather lay no more than a dozen of eggs because they carry their eggs with them for protection. They do not lay eggs. Thousands at one time, somtimes more but they only lay their eggs once, it is so tiring to swim up stream that they die after they lay the thousands of eggs. It's sad yes and srry but it gets worse only a few hundred of the eggs will hatch and less then that will live to do what their parent s did much less get to the ocean. No, not thousands.
The amount of eggs a female ostrich lays a year varies from eggs, with an average of 60 eggs per year. An ostrich usually lays around eggs at one time.
Log in. Study now. See Answer. Best Answer. Study guides. Fish 21 cards. Why and where do ocean fish migrate. This structure is unique to the lamprey. What type of symbiotic relationship does the goby and grouper demonstrate.
The firm flexible rod found in the dorsal area in chordates is called the. What nervous system initiates internal secretion contraction and absorption.
Genetics 23 cards. How many pairs of legs do insects have. What do Amoebas use for movement. What characteristic is used to group the three kinds of eubacteria. While fish do not sleep in the same way that land mammals sleep, most fish do rest. Research shows that fish may reduce their activity and metabolism while remaining alert to danger.
Some fish float in place, some wedge themselves into a secure spot in the mud or coral, and some even locate a suitable nest. The longest lived of all the popular freshwater fish is the goldfish. If provided proper feeding and a clean, healthy environment, these fish can live up to 15 years. The coelacanth — a giant weird fish still around from dinosaur times — can live for years, a new study found.
Killifish are among the aquarium fish with the shortest lifespan. They generally only live for a bit more than two years. Bettas are not far behind. This vent is on the underneath of the fish's body , close to one of the fins towards the tail end. If you have a pet fish, you might have seen it swimming around with something stringy-looking dangling underneath its body, near its tail?
That's its poo! Mermaids and mermen lives on a seafood diet. They're able to to eat land food. However, many of them think land food and drinks disgusting, choosing to eat prawns, seaweed and drink sea water instead. In most cases, the female drops eggs in the water which are immediately fertilized by sperm from the male. Another way is for fertilization to occur within the females body before she drops them into the water. With the third and final method, the female retains the eggs within her body and the young are born alive.
Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include guppies, mollies, platies and swordtails. The advantages of livebearing to the aquarist are that the newborn juvenile fish are larger than newly-hatched fry, have a lower chance of mortality and are easier to care for. Megapode, also called Mound Builder, or Incubator Bird, family Megapodiidae , any of 12 species of Australasian chickenlike birds order Galliformes that bury their eggs to hatch them.
Insects, turtles, lizards, and reptiles lay eggs, too.
0コメント