Cannibalism/aggression size ratios

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Andyroo

Redtail Catfish
MFK Member
Apr 17, 2011
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MoBay, Jamaica
www.seascapecarib.com
Wise folk,
My silver girl is shy of 2' long & going into her pond towards the end of August & I've ordered two more at ~4" for grow-out. Do silvers actually have the expected propensity for cannibalism along with infraspecific dominance aggression? Appreciating variability in moodiness, at what relative size can I safely move them over? 1/4 of SG's length, 1/3, 1/2, more?

Pond is a little under 6'x12', to be primarily planted with potted lilies as it's 6' deep without substrate (bamboo segments on cement).

Other fish will be a red swordtail "forage" & blue & yellow LkMalawi (lab?) as they seem to live mid-water when there's depth/space & are shock-bright against dark/deep. May add oscars/jags for fun, O.niloticus for the table. Will post subsurface vid once it's up & running.
 
I would say 1/2 the size or more, lower than that and the arowana although may not be able to eat the other arowana, can injury it serverly enough it may succumb to its wounds.

Side note, huge pond though, ever thought of owning catfishes like red tails, or stingrays? ?
 
Interesting question to me, because I've never had the heart to experiment, nor have I read of such trials by others, meaning at what size it is safe to introduce a juvi silver arowana to the company of subadult.

IME I've placed 2.5-footers with 1.5-footers with okay results but in much larger physical footprint tanks/ponds (arowana are of course indifferent to the depth, live on surface, meaning your great depth will not help). Our 3.5 ft alpha male has been okay with slightly sub 2 ft females, IDK what would happen if it was a male.

Gender does matter but the territorial and hierarchical relationship seems a complex one depending on:

- age,
- size,
- gender,
- sexual maturity,
- order-of-introduction,
- season,
- specimen personality.

The predatory instinct can be controlled by plentiful feeding but this practice comes with its own risks.
 
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