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Author Topic: max stocking  (Read 8774 times)
Teflon Don
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« on: November 27, 2015, 04:11:04 AM »

Why is it that stocking levels are all measured by the SL of a fish and not the weight or bio mass,as 10 neon tetra's are the same length as a 12"inch fish but their added mass is nowhere near the mass of a 12 " fish so in thinking someone could stock a tank a with many more than that silly 1 inch rule as long as they keep up maintenance.
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Pat Mary
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« Reply #1 on: November 27, 2015, 10:51:26 AM »

I don't know what "SL" is.

We here at Badman's do not go by the 1 inch myth.  Here is a link to a thread about it.  http://www.badmanstropicalfish.com/forum/index.php?topic=4192.0
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Teflon Don
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« Reply #2 on: November 27, 2015, 11:14:08 AM »

SL means standard length,nose to end of body not including tail.
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Pat Mary
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« Reply #3 on: November 27, 2015, 11:24:21 AM »

We never go by "SL".  We go by the needs of the species. 
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rasaqua
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« Reply #4 on: November 28, 2015, 02:19:27 PM »

Don,

Although I see your point, I don't think lining up 10 Neon Tetras (I'm thinking it may take 11) to achieve a 12 inch standard length is a good comparison to the analogy you are inquiring. I usually use the 'standard length' method when considering stocking and also the required resources of the fish species. If all our members were scientists and constantly conducting purposeful experiments with our fish, then perhaps we would bother with precise measurements and weights along with computing their ammonia production. But alas, we are just hobbyists (with a few exceptional scientists) and it is just easier to relate SL than it is total bio mass, along with ammonia production and biological oxygen demands.

I also see Pat Mary's point, but standard length (SL) is part of considering the needs of a species.  happy
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Pat Mary
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« Reply #5 on: November 28, 2015, 02:33:54 PM »

We never go by "SL".  We go by the needs of the species. 

I should have said that we never go by just SL....

Length (and sometimes height ie Angels) so, the size and shape of the fish would always be part of what we use but not the only thing. 
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Karen
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« Reply #6 on: December 02, 2015, 10:11:34 AM »

SL standard length- nose to caudal peduncle
FL fork length
  CFL curved fork length- follows the contours of the fish (used for fat fishies like tuna)
  SFL measured with a vernier calipers
TL total length - end to end

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Pat Mary
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« Reply #7 on: December 02, 2015, 10:20:43 AM »

Thanks, Karen.   Smiley
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TwoTankAmin
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« Reply #8 on: December 02, 2015, 10:57:17 AM »

Biomass is a far better determinant of waste production. However, even that can be inaccurate. Ammonia productions is not only dependent on the size of a fish, but also by its activity level. So a big inactive fish should produce less ammonia than a similar sized very active fish. Moreover, feedig will also influence ammonia production. the more a fish consumes, the more ammonia that will result.

However, ammonia is not the only consideration in stocking as noted above. The needs of each species as well as the ability of various species to cohabit are also important considerations in any stocking plan. No matter how large a tank one has, it will not protect prey fish from predators for example. Nor will it matter if two specific fish have totally different water parameter requirements. They do not belong together even if their temperaments are compatible and the tank is spacious enough.

There is only one good way to use the "inch per gallon rule" when stocking, and that is to ignore it totally.

As an aside, science tends to use SL while in the hobby TL tends to be prevalent in terms of fish length. Until the above post, I had not heard the term "Fork Length" (FL?).



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russ
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« Reply #9 on: December 02, 2015, 10:55:36 PM »

"Until the above post, I had not heard the term "Fork Length"


"we are just hobbyists (with a few exceptional scientists)"  Wink

Good point about fish activity levels  happy


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