• Freshwater
    • Feature Articles
    • Columns
    • Species Profiles
  • Saltwater & Reef
    • Feature Articles
    • Columns
    • Species Profiles
  • Aquatic Plants
    • Feature Articles
    • Columns
    • Species Profiles
  • Aquarium Basics
    • Aquariums
    • Aquascaping
    • Aquarium Setup Guide
    • Filtration
    • Fish Selection & Stocking Guide
    • Foods & Feeding
    • Lighting
    • Maintenance
    • Salt Mix
    • Temperature Control
    • Water & Air Pumps
    • Water Treatment
    • Columns
  • TFH Blogs
    • Adventures in Aquascaping
    • Breeder's Challenge
    • Aquatic News
    • TFH Extras
    • Aquatic Books
    • Aquatic Videos
    • Aquatic Deals
    • Featured Products
    • Industry News
  • Inside TFH Magazine
    • Current Issue
    • View TFH Digital
    • Article Indexes
    • Authors & Columnists
    • Search Archives
    • Covers Gallery
    • Downloads
widget @ surfing-waves.com
  • TFH Forum Main ‹ TFH Q & A Column
  • Change font size
  • Print view
  • FAQ
  • Register
  • Sign In
  • New Posts

Minimum School Size

Have a Freshwater/Saltwater Question? This is a place to put it and maybe it will be used in an upcoming issue of TFH Magazine in the Freshwater Q&A, Saltwater Q&A, or letters to the editor.
Post a reply
11 posts • Page 1 of 1

Minimum School Size

Postby Geoff (31) » Sat Sep 17, 2016 5:15 pm

In my experience, a minimum of 6 fish in a school is often recommended when stocking freshwater aquaria. What is the specific reasoning behind that number 6? What is so special about it? Why not 5 or 7? I myself will recommend a minimum of 6 (but more is better if space allows) but am often at a loss to explain why 6 is the magic number. Or does the TFH Magazine have a better school size recommendation or method of determining how to stock schooling fish? If so, what is the specific reasoning behind it?

Thank you!
Geoff

User avatar
offline

New Member
New Member
 
Joined: Wed Jul 15, 2015 10:03 pm
Location: Stroudsburg, PA
Top

Re: Minimum School Size

Postby dwaink (85) » Sat Sep 17, 2016 5:54 pm

not an expert here but i will say that 6 is the minimum number to allow dispersion of aggression so that no one individual is picked on too much.
"If you would be thought agreeable in society, you must consent to be taught many things you already know."
dwaink

User avatar
offline

Member
Member
 
Joined: Fri Jun 03, 2016 3:12 pm
Location: New Albany IN
Top

Re: Minimum School Size

Postby Geoff (31) » Sat Sep 17, 2016 6:03 pm

I understand why schooling fish need to be in schools, aggression dispersion being one of the reasons, but my question is about the specific minimum number. How was it derived? Why 6? Why not 5 or 7 or 10?
Geoff

User avatar
offline

New Member
New Member
 
Joined: Wed Jul 15, 2015 10:03 pm
Location: Stroudsburg, PA
Top

Re: Minimum School Size

Postby C. Andrew Nelson (1325) » Sat Sep 17, 2016 8:09 pm

I don't know if I have an answer, but it is an excellent question. I find this sort of thing fascinating: why does something become the norm? Why is six the almost universally excepted minimum for a group of schooling fish? Here are some possibilities that come to mind...

1. Attrition. To safeguard against the possibility of fishkeepers losing some of the fish they just purchased so that they still have enough to protect against aggression, etc. (i.e. - five being enough, but get six just in case).

2. Pairing. Each fish has a buddy or a possible mate. Or you increase the likelihood of getting a breading pair if you have at least six. Also if one pair spawn the other four fish can keep each other occupied.

3. Psychology. Schooling fish obviously feel more at ease in a large school. Not all potential fishkeepers are going to buy a large school of fish. Many may be ignorant of the psychological and sociological needs of a fish species so by recommending six there are at least enough fish in the school for them all to feel comfortable. And keep in mind that six is really "at least six" or "a minimum of six".

4. Sales. Here's the cynic in me. It may be that the notion of six has been perpetuated by pet store and other sellers of tropical fish in order to increase sales. Over time it became an accepted norm as people began to see the benefits of stocking at least six of any schooling species. I admit that this isn't the most likely of theories, but it came to mind so I figured I'd include it.

5. Authority. Another possibility is that a long while back a respected authority such as Dr, Herbert Axelrod or someone of his caliber made the recommendation of six and the rest of the world decided that if so-and-so authority says six then who am I to argue?

6. Arbitrary. Who knows? Maybe someone picked the number six out of thin air and it stuck. You repeat something enough times (and get others to repeat it) eventually people begin to accept it. Look at how many falsehoods and "old wive's tales" there are in this hobby that persist even to today.

7. Esthetics. I covered this in one of my recent videos on my Aquatasy channel on YouTube. Human brains are wired to perceive an odd number of objects (or subjects) as random and an even number of them as ordered. Six fish schooling together appear more structured are more visually impressive than five.

8. Because. We do not question such things! Shut up and get six schooling fish and no one gets hurt! ;)

Like I said, I don't have an actual answer. This is simply speculation on my part. I'm curious to know the truth of this.

:fish: :fish: :fish: :fish: :fish: :fish:
C. Andrew Nelson
Visual Effects & Animation Consultant
Actor & Comedian
Tropical Fish Fanatic

https://www.youtube.com/user/aquatasy
C. Andrew Nelson

User avatar
online

Member
Member
 
Joined: Sat Apr 07, 2012 7:16 pm
Location: San Francisco Bay Area
  • Website
Top

Re: Minimum School Size

Postby Geoff (31) » Sat Sep 17, 2016 8:16 pm

I think all your possible answers make sense! I think there's a bit of truth in all of them. Number 8 made me laugh, mainly because some people are actually like that!

Maybe the magazine will publish my question and we'll get an answer once and for all!
Geoff

User avatar
offline

New Member
New Member
 
Joined: Wed Jul 15, 2015 10:03 pm
Location: Stroudsburg, PA
Top

Re: Minimum School Size

Postby Crazygar (18139) » Sun Sep 18, 2016 8:20 am

I am on of the "odd is better" school. I prefer, 5, 7, 9 so on and so forth. Allows one to be the alpha and others to develop pairs. But for all the reason stated above, not only that, fish require social groups, just as us humans. The more, the more secure they feel.

Gary
Image
THe Complete Journal Directory Thread / 4 Corners Tanganyika Project

"I would rather be hated for who I am, than loved for who I am not."
Crazygar

User avatar
offline

Gary Gnu the Administrator
Gary Gnu the Administrator
 
Joined: Wed Jan 21, 2004 6:09 am
Location: Belle River, ON
  • Website
Top

Re: Minimum School Size

Postby Diana (1256) » Sun Sep 18, 2016 10:57 am

The human brain can usually see 5 of something, and count it without assigning a number to each fish.
More than that is harder to count. You have to look, and say, " One... two... three..."
so if there are a minimum of 6 than you don't bother counting, you just say there is a school of fish.

Another reason: Among fish, (and almost everything else) there will be one or more that just do not want to hang out with the crowd. If you start with less than 6 and one wants to go explore somewhere else your school becomes 5 or fewer which is too few to look like a school.

I also agree with the concepts above: Even in schooling fish each is an individual. You can have more aggressive and less aggressive fish. When the group is too small then the most aggressive fish will repeatedly attack the least aggressive fish. When the group gets larger the less aggressive fish can lose itself in the crowd, and the more aggressive fish spreads out its aggression among the other fish so no one fish gets pestered to death.
You still should watch their behavior. If you have one that is a lot more aggressive than average for the species I would remove that one.

I find a larger school even better. 2 dozen+ Cardinal Tetras in a large enough tank can sure behave like a true school, coordinating their swimming so that the school seems to flow as a unit. Fewer than that just do not give that group impression.
Diana

User avatar
offline

Aquapedia Mentor
Aquapedia Mentor
 
Joined: Sun Jan 17, 2010 7:58 pm
Top

Re: Minimum School Size

Postby C. Andrew Nelson (1325) » Sun Sep 18, 2016 7:24 pm

Crazygar wrote:I am on of the "odd is better" school. I prefer, 5, 7, 9 so on and so forth. Allows one to be the alpha and others to develop pairs.


Me too. Especially if it is more of a shoaling species I will get an odd number of them, usually five. If it is a tightly schooling species like Rummy-Nose Tetras or Harlequin Rasboras I get at least six, preferably more.

Diana wrote:The human brain can usually see 5 of something, and count it without assigning a number to each fish.
More than that is harder to count. You have to look, and say, " One... two... three..."
so if there are a minimum of 6 than you don't bother counting, you just say there is a school of fish.


That is an excellent observation, Diana! You are 100% correct.

Diana wrote:Another reason: Among fish, (and almost everything else) there will be one or more that just do not want to hang out with the crowd. If you start with less than 6 and one wants to go explore somewhere else your school becomes 5 or fewer which is too few to look like a school.


True. I had not thought about that.

Diana wrote:I find a larger school even better. 2 dozen+ Cardinal Tetras in a large enough tank can sure behave like a true school, coordinating their swimming so that the school seems to flow as a unit. Fewer than that just do not give that group impression.


Indeed! There is nothing quite as impressive as the sight of a bona fide school of fish.
C. Andrew Nelson
Visual Effects & Animation Consultant
Actor & Comedian
Tropical Fish Fanatic

https://www.youtube.com/user/aquatasy
C. Andrew Nelson

User avatar
online

Member
Member
 
Joined: Sat Apr 07, 2012 7:16 pm
Location: San Francisco Bay Area
  • Website
Top

Re: Minimum School Size

Postby Crazygar (18139) » Mon Sep 19, 2016 7:43 am

Schooling fish is the ultimate goal in this hobby. A large tank with a cohesive school... what a sight.

Gary
Image
THe Complete Journal Directory Thread / 4 Corners Tanganyika Project

"I would rather be hated for who I am, than loved for who I am not."
Crazygar

User avatar
offline

Gary Gnu the Administrator
Gary Gnu the Administrator
 
Joined: Wed Jan 21, 2004 6:09 am
Location: Belle River, ON
  • Website
Top

Re: Minimum School Size

Postby C. Andrew Nelson (1325) » Mon Sep 19, 2016 5:21 pm

Are you dreaming again, Gary, of another huge tank with every Ember Tetra in Canada you can find?
C. Andrew Nelson
Visual Effects & Animation Consultant
Actor & Comedian
Tropical Fish Fanatic

https://www.youtube.com/user/aquatasy
C. Andrew Nelson

User avatar
online

Member
Member
 
Joined: Sat Apr 07, 2012 7:16 pm
Location: San Francisco Bay Area
  • Website
Top

Re: Minimum School Size

Postby Crazygar (18139) » Wed Sep 21, 2016 3:06 pm

That would be the dream, and yes, it was a school of 35.

Gary
Image
THe Complete Journal Directory Thread / 4 Corners Tanganyika Project

"I would rather be hated for who I am, than loved for who I am not."
Crazygar

User avatar
offline

Gary Gnu the Administrator
Gary Gnu the Administrator
 
Joined: Wed Jan 21, 2004 6:09 am
Location: Belle River, ON
  • Website
Top


Post a reply
11 posts • Page 1 of 1

Return to TFH Q & A Column

Who is online

Users browsing this forum: No registered users and 1 guest


° C = ° F             Litres = US Gallons             cm = Inches            
  • TFH Forum Main
  • The team • Delete all board cookies • All times are UTC - 5 hours [ DST ]
Powered by phpBB® Forum Software © phpBB Group

To bring together Aquatic Hobbyists from around the World sharing experiences, teaching, and learning to succeed in the Hobby while building friendships with other passionate Hobbyists

Advertise with TFH | Sell with TFH Magazine | Email Preferences | Submission Guidelines | FAQ | Subscriptions | Contact Us | Site Map | Legal Terms | Privacy Policy
©2007 Tropical Fish Hobbyist, a Central Garden and Pet Company. Proud to be partners with PetUniversity.com
cron