Q how do coelacanth look after its babies

[firedrukario]

yes as the topic how do coelacanth look after its babies :eek2: :)

 

by the way this should be MOVED!! :D :D ;)

[Boerseun]

A: Probably with its beady little eyes. Or, more likely, it just ignores them like most other fry gets ignored by their careless parents.

 

Where did this come from? Did you actually place this thread, or tried to reply to some other thread and pressed the wrong button?

[firedrukario]

what r u talking about? this 4 my school subject!! r u sure that's the answre?

[Chacmool]

what r u talking about? this 4 my school subject!! r u sure that's the answre?

You must learn to recognise sarcasm. But there is a lot of truth in Boerseun's statement: fish usually aren't very caring parents, and the young are often left to fend for themselves. I went to the trouble of finding these interesting articles for you - you'll find the conclusive answer in one of them. But remember, this forum is for scientific discussions, and not for us to do your homework for you.

 

http://encarta.msn.com/encnet/refpages/RefArticle.aspx?refid=761572373

http://www.arkive.org/species/GES/fish/Latimeria_chalumnae/more_info.html

http://www.amnh.org/exhibitions/expeditions/treasure_fossil/Treasures/Coelacanth/coelacan.html?aa

http://sacoast.uwc.ac.za/education/resources/fishyfacts/coelacanth.htm

http://www.mnh.si.edu/highlight/coelacanth/

 

I hope you remain inquisitive and keep on exploring. Welcome to Hypography!

[UncleAl]

http://www.mazepath.com/uncleal/coel.htm

[Qfwfq]

Mildly amusing Unc, but where did you get the idea that:

 

"If the number of fish is X, then each sex numbers about X/2. The chance of boy meeting girl is (X/2)(X/2). If their numbers drop 95% to one in 20, their meeting rate drops to one in 1600."

 

from? I suspect that your not one of the janitors. :shrug:

[Fishteacher73]

Many fish are hermaphroditic to help even the odds a bit. (at least many marine ones are...Fresh water fish have much more confined ranges and not subject to the needs of such a system).

[UncleAl]

Cod feed off lower parts of the food chain. Those lower parts feed off cod larvae. A Grand Banks large cod pupulation dumped purely huge numbers of juveniles each mating season, swamping local appetites and providing a food resource for older fish. The contemporary all but destroyed cod population cannot glut predator appetites. Despite grand tales of Official Truth, Grand Banks' cod fishing appears to be permanently well and truly dead.

 

The simple solution is to forget about cod and introduce a survivable fish with economic value - something big, angry, reproductive, and valuable when harvested. Let's not forget that last parameter.

[firedrukario]

Mildly amusing Unc, but where did you get the idea that:

 

"If the number of fish is X, then each sex numbers about X/2. The chance of boy meeting girl is (X/2)(X/2). If their numbers drop 95% to one in 20, their meeting rate drops to one in 1600."

 

from? I suspect that your not one of the janitors. :lol:

 

 

i don't understand what u talking about :hihi:

[Chacmool]

i don't understand what u talking about :hihi:

Have you read the relevant articles yet? Have you found the answer?

[firedrukario]

yes i did read the hyperlink webs and now i'm CHECKING!! i just got on this website 1 min ago cause i only go on here once a week

 

EDIT: um this web u gave me ( http://sacoast.uwc.ac.za/education/resources/fishyfacts/coelacanth.htm ) was news about coelacanth cause i already saw this page, i check on infos as well i'm not a lazy person.

[nkt]

Al, as ever, brilliant!

 

The 1/20 ^2 answer is correct, of course, in the simple case. Cod move in shoals, though, so it's not quite that bad.

 

Of course, the fish only breed in large numbers, and, as you further point out, the annual feeding frenzy on the cod larva is now somewhat muted, and so most of the fish larva fail to get that little bit bigger and survive. Add to that the obvious conclusion that the stuff that feeds on the larva will slowly die off, and then so will more of the grown cod...

 

Human fishing targets larger shoals first, with scary efficient net systems that take 99.9% of the shoal in one go, regardless of the size, using sonar for guidance. This further disrupts the patterns that fish evolved to protect themselves over many years. Heavy selection pressures against forming a shoal suddenly appear - but there is still the usual issue of non-human predators pushing the other way. Suddenly, the outlook for the fish looks really bleak.

[Qfwfq]

The 1/20 ^2 answer is correct, of course, in the simple case.

It depends on what Unc meant by "the chance of boy meeting girl".

:eek2:

[Chacmool]

yes i did read the hyperlink webs and now i'm CHECKING!! i just got on this website 1 min ago cause i only go on here once a week

 

EDIT: um this web u gave me ( http://sacoast.uwc.ac.za/education/resources/fishyfacts/coelacanth.htm ) was news about coelacanth cause i already saw this page, i check on infos as well i'm not a lazy person.

So you might have found by now that the reproduction of the coelacant is of a type called ovoviviparous, which means that it has internal fertilisation, and the foetuses are kept inside the mother until they are large enough to look after themselves. In other words, the mother doesn't look after her young after they have been born - they have to fend for themselves.

[Qfwfq]

But...

and the foetuses are kept inside the mother until they are large enough to look after themselves

I would take that to be oviparous, if the eggs don't hatch after foetal stage. :eek2:

[Chacmool]

But...I would take that to be oviparous, if the eggs don't hatch after foetal stage. :eek2:

Oviparous refers to laying eggs, and the young then hatching from the eggs. In the case of the coelacanth, which is ovoviviparous, the eggs are kept inside the body of the mother, and the young are born live.

[Qfwfq]

Ooohps, :eek2:, yes. I meant to say viviparous!