Bderick67;3055990; said:
dang thats a super dark black arrow.
usually i seen them with just dark fins.
did you put tetras in when it was bigger? or since it was small?
arowana with neon tetras?
- Thread starter ilovearowanas
- Start date
dang thats a super dark black arrow.
usually i seen them with just dark fins.
did you put tetras in when it was bigger? or since it was small?
predators select prey size carefully. There's something called optimal foraging strategy that means animals will get food in the most profitable way, i.e., the most energy gained from prey compared to the most energy used up getting that prey. This applies equally to herbivores as well as carnivores.
Work done several decades ago on sunfish demonstrated that they will swim a small distance to catch small daphnia but a longer distance to catch bigger daphnia. Small daphnia at a far distance will be ignored if small daphnia closer by are present. Since small daphnia provide little energy, the sunfish will only expend a small amount of energy catching them. Bigger daphnia return more energy, so it's worthwhile swimming more to catch them. If less food is about, the sunfish becomes less picky, swimming further to take smaller prey. When food is abundant, the sunfish is more picky, and will swim shorter distances for smaller prey.
I'd caution against using optimal foraging theory as an excuse to mix small fish with big predators though. While I've seen it done with, for example, piranhas in big tanks with guppies, it isn't 100% reliable. In an aquarium fish will adopt learned behaviours, connecting the presence of humans with the appearance of food. That's probably going to override their optimal foraging programming.
Work done several decades ago on sunfish demonstrated that they will swim a small distance to catch small daphnia but a longer distance to catch bigger daphnia. Small daphnia at a far distance will be ignored if small daphnia closer by are present. Since small daphnia provide little energy, the sunfish will only expend a small amount of energy catching them. Bigger daphnia return more energy, so it's worthwhile swimming more to catch them. If less food is about, the sunfish becomes less picky, swimming further to take smaller prey. When food is abundant, the sunfish is more picky, and will swim shorter distances for smaller prey.
I'd caution against using optimal foraging theory as an excuse to mix small fish with big predators though. While I've seen it done with, for example, piranhas in big tanks with guppies, it isn't 100% reliable. In an aquarium fish will adopt learned behaviours, connecting the presence of humans with the appearance of food. That's probably going to override their optimal foraging programming.
Agree. Mines got instant drop eye from freaking out in my tank and hitting itself on the canopy glass.Hao;3056867; said:
wow.prskiller;3057009; said:
they get drop eye from the food they eat too right?
such as if its too fatty or something?
I'm surprised that aro is living with the tetras with no prob.
Usually even as a juvi, the aro will most likely still go after tetras as they are the size of guppies.
Usually even as a juvi, the aro will most likely still go after tetras as they are the size of guppies.
