Join Date: Feb 2012
Location: Ontario, Canada
Grade doesn't make a difference in 90% of the bee shrimps, the difference comes from the strain. Some strains are harder to breed especially the high quality pure line because they way the breeders use for selected breeding.
Selected breeding: Most people put all the breeding shrimps in a tank, and cull the ones they don't like and keep the tank going (let's call it method A). Some top Asian breeders do it differently. They take the best from the F1 and put them in a different tank to breed them, then again in F2 (let's call it method B). They don't back cross unless there's issue in the Fn, because doing so is stepping backward. You may think the result should be the same but it's not. Method B gets the blood pure for the characteristics intended (leg coverage, white thickness, ... etc), and Fn is always better than F(n-1) genetically speaking. But method B not only requires more tanks, also is slower, and the resulting shrimps breed much slower, but you are sure the shrimps are going toward your goal. These shrimps would be harder to keep/breed, grow slower, no matter the "grades".
And because these breeders don't want others to get, say, the culls in F4 or F5 from method B and get a short cut, they mix them with offspring from method A so their result can't be "stolen".
PS: shrimps from method B normally cost more than $x00 each, so don't worry too much you'd get them by accident ;-)
Last edited by randyl; 03-10-2013 at 06:29 PM.