Biotodoma variety try broadly gregarious and you may tends to inhabit teams unless spawning with juveniles in particular showing an effective public impulse when threatened. A small grouping of 5-8 some body is always to hence end up being the minimal pick that often setting an apparent dominance hierarchy and this contributes behavioural appeal to the observer. Whenever managed during the reduced number weaker specimens may become the goal out-of an excessive amount of discipline from the principal anybody or the class may falter to settle and you may perform nervously.
Numerous writers have suggested that the sexes is actually distinguishable by the development regarding sideways-focused, iridescent blue marks hence offer regarding under the prior percentage of the eye towards idea of your own snout.
Into the people this type of scars have been believed to mode unbroken stripes, whereas in women he’s meant to mode a few changeable blotches. This has been suggested your cause for this will be one to ladies reside in deeper drinking water if you find yourself males like the shallows consequently they are ergo more quickly available to debt collectors, but which appears dubious considering the number of juveniles exported.
A plausible hypothesis are that Biotodoma types need some time to getting adult and are generally for this reason maybe not quickly sexable, which also can explain the apparent ‘difficulty’ in-breeding them when you look at the aquaria (see ‘Breeding’).
According to observations out of breeders both men and women is has actually streak to your head however, males tend to develop a small huge, is deeper-bodied and produce prolonged filamentous extensions on dorsal and caudal fins than simply females.
It varieties try a good biparental substrate spawner preferring to place the egg to your rocks being partially-hidden throughout the substrate.
Intimate readiness seems to be attained at 18-2 years of age, and you may simulation of changes between dry and damp season appears helpful in regards to stimulating new seafood so you’re able to reproduce.
The second can be carried out through a time period of keeping the fish during the a stable temperature which have apparently couple water alter and you may insufficient liquid path, with every day liquid transform out of 20-twenty five % container volume, if at all possible having fun with rain water or softened tap water, as well as improved turbulence playing with an effective powerhead or equivalent (J. Mcelheron, persm.).
It has been written you to definitely spawning happens in a pit excavated throughout the substrate since looking conduct might have been noticed before spawning, but it appears that the newest fish are making an effort to discover the truth rocks hidden in the substrate instead of do a beneficial spawning site out-of scratch.
Including, a merchant account was blogged regarding magazine ‘Buntbarsche Bulletin’ in the 1991 where an adult pair are eliminated in order to a unique tank and you can spawned several times in the pretty normal styles towards the eggs deposited in the centre regarding a superficial pit excavated on the substrate because of the both parents. The newest egg several times vanished up to an apartment stone was put into new spawning gap and removed due to the fact spawning procedure was over. The newest fry was indeed totally free swimming immediately following five days.
SF factor Joe Mcelheron together with learned that this new fish well-known to help you utilize the edge of a stone to possess spawning intentions, and that good feet appears to be extremely important just like the bright orange eggs was connected to it by short adhesive filaments hence allow them to move to a level and you can allegedly allow good standard of water direction around them too.
The guy observed one more youthful adult fish inside their first 12 months went from movements off digging pits throughout the substrate but performed perhaps not spawn. Later on they became obvious one to spawning and courtship is initiated because of the this new lady and therefore started to search pits, swimming during the a mind-off condition that have darkened colouration, and you will engage in lip-securing demonstrates to insist dominance. At this point the brand new men just weren’t on it while they stayed regarding vicinity, searching to look at proceedings between the girls.