Site for children


P About H E M The H To And

How many species of fish inhabit the waters of our planet?

In the modern fauna, there are more than 20 thousand species of fishes and fish-like - more than mammals, birds, reptiles and amphibians combined.

In the waters of Russia there are about 1500 species, 300 species are inhabitants of fresh water.

A tenth of all species of fish are fish. They provide many valuable products: food, medicines, pet food, fertilizer for the fields, technical fats and raw materials for light industry. There are freshwater, anadromous and marine fishes.

Freshwater fish spend their lives in rivers, ponds and lakes.

Anadromous and catadromous fish fatten and grow in the sea and breed in the rivers. Anadromous fish do far journeys from feeding to breeding grounds in the upper reaches of the river, with a length up to several thousand kilometers; catadromous usually does not extend far into the sea and do not rise high in the river.

Among marine fishes distinguish pelagic - living in the upper layers of the sea surface (e.g., herring and mackerel), demersal and benthic fish in the bottom waters or on the bottom (for example, cod and flounder).


 


Please rate the answer:
1 2 3 4 5

Total votes: 104

Your comments:

Valya
2014-06-14 18:08:12
a bit boring Beck pics
bear
2014-04-26 18:09:27
I agree with you
Leo
2014-03-21 16:46:06
And how did you know??? If the scientists are still not experienced 70% ocean
Valya
2014-02-04 13:03:15
never thought that so many fish live !;-)
bingo
2013-09-19 22:51:41
there's not even vidushak
vnroman
2013-02-16 00:47:29
There is such ichthyological research site fishbase.org and there, at the beginning of 2013 are about 32400 species of fish.
Jan
2012-10-25 10:50:02
and... it really
Cleo
2012-07-24 12:30:41
you're wrong Ramis them much more sprosil how I know my dad is just the scientist in Londen
Ramis
2012-01-03 08:27:41
actually from 25 th to 31 thousand of species on Earth

Show all comments

Your name (nick):
Comment:
Enter the result of the calculation
     

Howcast

  © 2014 All children