Login

Join for Free!
118898 members


bottom and surface dwelling fish

Animals!

Moderator: BioTeam

bottom and surface dwelling fish

Postby Adz795 » Tue Dec 27, 2011 8:34 am

Q. Values of the total surface area of gills (in arbitrary units) per unit gram body weight of two types of fish are given below:
Fish I: 442
Fish II: 1725
One of them is a bottom dwelling fish while the other is a surface dwelling fish. Identify the two types.

That was the question. I don't understand the relationship between bottom/surface dwelling and distinct requirements for gas exchange. Please explain.
User avatar
Adz795
Death Adder
Death Adder
 
Posts: 82
Joined: Fri May 06, 2011 9:16 am
Location: Mumbai, India

Postby canalon » Thu Dec 29, 2011 6:25 pm

Think about why a fish would need relativley more gill than another? what advantage that would provide? which of those 2 environments would favour such an evolution?
This is also related to the way gas diffuse in water...
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)
User avatar
canalon
Inland Taipan
Inland Taipan
 
Posts: 3909
Joined: Thu Feb 03, 2005 2:46 pm
Location: Canada

Re:

Postby Trevor » Fri Dec 30, 2011 2:13 pm

canalon wrote:Think about why a fish would need relativley more gill than another? what advantage that would provide? which of those 2 environments would favour such an evolution?
This is also related to the way gas diffuse in water...


I agree. The deeper the water, pressure increases and the oxygen levels will be less than those available to surface-dwellers. Therefore- they would need a greater surface area of gill to extract as much O2 as possible. This is can be seen in humans as well. People who spend most of their lives in higher elevations (Let's say Denver) will have a higher lung capacity than someone from, say New Orleans. Same can be seen with musicians who play a woodwind instrument- an increased lung capacity. So it all relates. Right?
As canalon said, the differnce in environments can cause the difference too.
User avatar
Trevor
Garter
Garter
 
Posts: 4
Joined: Fri Dec 30, 2011 1:50 am
Location: New Jersey, USA


Postby JackBean » Fri Dec 30, 2011 10:35 pm

LOL, Denver is high? :lol:
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
User avatar
JackBean
Inland Taipan
Inland Taipan
 
Posts: 5690
Joined: Mon Sep 14, 2009 7:12 pm

Re:

Postby Trevor » Sat Dec 31, 2011 1:48 am

JackBean wrote:LOL, Denver is high? :lol:

:lol: Generally speaking compared to sea level, why not. :)
User avatar
Trevor
Garter
Garter
 
Posts: 4
Joined: Fri Dec 30, 2011 1:50 am
Location: New Jersey, USA

Postby JackBean » Sat Dec 31, 2011 2:11 pm

generally speaking, Netherlands is higher than sea level as well (at least most of it), but we are talking about changes in oxygen level, are we not?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
User avatar
JackBean
Inland Taipan
Inland Taipan
 
Posts: 5690
Joined: Mon Sep 14, 2009 7:12 pm

Re:

Postby Trevor » Sat Dec 31, 2011 8:09 pm

JackBean wrote:generally speaking, Netherlands is higher than sea level as well (at least most of it), but we are talking about changes in oxygen level, are we not?

Yes we are. I didn't know that, I've never been to Europe. Or out of the country.
User avatar
Trevor
Garter
Garter
 
Posts: 4
Joined: Fri Dec 30, 2011 1:50 am
Location: New Jersey, USA

Postby JackBean » Sun Jan 01, 2012 8:43 pm

How is that related?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
User avatar
JackBean
Inland Taipan
Inland Taipan
 
Posts: 5690
Joined: Mon Sep 14, 2009 7:12 pm

Postby Adz795 » Mon Jan 02, 2012 5:44 am

Thanks a lot canalon. I do approach situations with questions similar to the ones you suggested. The reason I posted this question was that the answer says that Fish I (442) is bottom dwelling and Fish II (1725) is surface dwelling. That is contradictory to Trevor's logic (and mine too). I don't see any reason for this answer though I can assure you that the answer is correct.

The question was asked in the Indian National Biology Olympiad 2011 and the given options were:

a. Fish I is marine while Fish II is freshwater fish
b. Fish I is bottom dwelling while Fish II is surface dwelling
c. Fish I is a bony fish while Fish II is a cartilagenous fish
d. Fish I has a small body mass while Fish II has a large body mass

I chose d. but the answer was b.
(Well, now I think d. has to be wrong because larger gas exchange area per unit body mass has to be relatively more in a fish with smaller body mass than one with a larger body mass)

Thanks a lot Trevor, we share the same idea =)
User avatar
Adz795
Death Adder
Death Adder
 
Posts: 82
Joined: Fri May 06, 2011 9:16 am
Location: Mumbai, India

Re: bottom and surface dwelling fish

Postby Gavin » Mon Jan 02, 2012 6:02 am

Cold water can hold more oxygen than warm water. Bottom waters tend to be colder than surface waters.
Gavin
Coral
Coral
 
Posts: 108
Joined: Sun Jun 14, 2009 10:44 am

Postby Adz795 » Mon Jan 02, 2012 6:06 am

I've made a fool of myself.

Thank you very much Gavin.
User avatar
Adz795
Death Adder
Death Adder
 
Posts: 82
Joined: Fri May 06, 2011 9:16 am
Location: Mumbai, India

Re: bottom and surface dwelling fish

Postby Gavin » Mon Jan 02, 2012 6:18 am

You're welcome, and I doubt you're a fool.
Gavin
Coral
Coral
 
Posts: 108
Joined: Sun Jun 14, 2009 10:44 am


Return to Zoology Discussion

Who is online

Users browsing this forum: No registered users and 0 guests