betta jargon 

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It's not Chinese silly, it's "Bettash" 


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acclimate the process of introducing new bettas into your fishroom (or tank), gradually transferring them from their water to your water and new surrounding.
anal fin Mr. betta's bottom large fin.
BF  short for "Butterfly". A betta fin color pattern in which the fins and tail are half one color and half another. For example fins might be half red and half white, and this would be noted as a : BF red/white.
BBS short for Baby Brine Shrimp (cause we are busy people and stuff LOL).  
bubble nest a bunch of bubbles Mr. Betta has a knack for blowing in a corner of his tank or jar. May look like foam. bubble nests are used to support the betta eggs during the breeding process. a bubble nest is a sign of good health and also that the male betta desires to spawn (well, in most cases, that is LOL). bubble nests are always desirable. 
combtail a trait that produces fringes on the edge of the betta's finnage, making it look like a 'comb'. an exageration of this trait produced the crowntail variation.
condition the process of preparing bettas for mating. usually consists of feeding very nutritive foods, giving vitamins, and generally speaking pampering the pair.
community tank a tank that houses several fish of different species. can also be a tank housing a number of betta females.
crowntail (see combtail). a betta with exaggerated fringes on his fins and tail. fin edges may look like a 'crown' and this trait can be very pretty. this is a very recent mutation.
culling the action of terminating bettas that are either flawed, defective or sick and that the breeder does not want to keep because they cannot be bred or sold. 
culls bettas that the breeder does not want to keep or breed or sell. usually have some flaw, may it be a color flaw, pattern flaw, poor finnage, crooked spine, missing ventrals or any other defects.
delta a betta tail shape, which looks like a triangle with sharp angles.
deportment behavior. A betta with good deportment would be one that acts active, flares, and carries himself well. 
display (see "flaring")
dorsal Mr. Betta's top fin.
DR short for Double Ray. usually used to describe crowntails. 
DT short for Double Tail. A DT betta will have 2 tail lobes instead of just one. 
F1 symbolizes the first generation during a breeding process. likewise, F2 would mean that this is the second generation of the specific cross.
fishroom a room that has been reserved for keeping and/or breeding fish.
flaring when a betta spreads all his fins and opens his gill covers, and "displays" to another male or a potential mate.
fry small offsprings of Mr. and Mrs. Betta :)
four branch finnage (see tertiaries). When tertiaries branch once again into two more rays, we have a 4-branch type finnage. Any 4-branch finnage would usually result in a halfmoon type fish. Downside is that such fish tend to blow their tails very fast (finnage is too heavy) and oftentimes may be unbalanced, swimming with their tail down, because tail is too heavy to be supported properly by body.
grow out tank a larger tank in which fry are growing.
geno short for genotype. the betta carries a gene but does not shows it. for example a black melano geno is a betta that might be simply blue, but carries black melano and will produce blacks if mated to an appropriate female. Sometimes they are slight indications that may indicate if a betta is a DT geno, or melano geno, or opaque geno, but primarily you will not know and will have to rely on the knowledge and credibility of the breeder you are purchasing from. 
halfmoon a betta with a tail that has a full 180 degree angle. these are rare and hard to produce. any true halfmoon male will be very costly.
jarring the process of removing young bettas from the community tank or grow out tank and putting them in separate jars so they might not fight with each other.
juvenile a very young betta that may not be sexable yet and has not yet started growing long fins. usually may be about 6 to 8 weeks old.
labyrinth a special breathing system that allows bettas to get oxygen from air above the surface of water.
melano a betta that is black because it has a lot of melanins, which is a black pigment that can be found in plants, animals and human hair. 
opaque a gene that causes a milk like thick layer of pigment to be present, which makes the color turn 'opaque' as in 'not see through'. This gene, combined with a few others was essential in creating the white opaque strain. White opaques are now a day referred to as simply "opaques", as they are by far the most popular of all strains that derived from the opaque gene. Nonetheless "opaque" is not a color, it is a trait.
outcross the process of crossing a new 'outside' line with your own line. outcrossing is necessary ever few generations to prevent a line from becoming too inbred and starting to show sign of weakness as well as possible deformities.
pectorals small sized roundish fins located on both sides of the betta (near head) which have for function to allow fish to hold it's position in water, steer or even back up. Can be used to move forward at a slow pace.
pheno short for phenotype. the betta shows the desired genes. for example a black melano pheno is a betta that is black. you can tell he carries black by just looking at him.
piebald a betta with a flesh colored face. body might be red, blue, black or any other darker color. 
plakat a wild type betta with short fins, oftentimes referred to as a "fighter"
ray one if the bony spines supporting the membrane of a fish's fin. it extends in the form of a straight line from the body. you can count the number of rays in a betta's dorsal for example.  
SR short for Single Ray. usually used to describe crowntails. 
ST short for Single Tail. a ST betta has only one tail lobe.
super delta (see 'delta') a betta tail shape that is both triangular and also has a very wide angle, usually above 120 degrees.
tertiaries Branching of betta's rays in tail area. One ray splits in two, than each of these two splits it another two. These last two rays are called tertiaries, since they are on the third level of ray branching.
ventrals two thin and long fins that hang down, just next to Mr. Betta's anal fin.