Using hormones to induce fish breeding

ml708

New member
Does anyone use hormones eg ovaprim to induce gamete production in fish? Would be helpful in breeding fish that don't spawn in an aquarium setting!
 
Is that so? I was under the impression that wild collection of fish is the norm. Examples of fish that can't be bred include moray eels, most angelfish etc
 
I have yet to see moray eels or imperator angelfish even spawn, for example. Moray eel males tend not to produce milt while imperator angels don't even mate.
 
Much of the problem is large enough tanks for proper spawning behavior. Without that, you might get them into condition with hormones, but they still won't spawn. While you could manually strip eggs and milt, Gresh alludes to, and frizzo states the big problem...rearing the larvae.
 
I have yet to see moray eels or imperator angelfish even spawn, for example. Moray eel males tend not to produce milt while imperator angels don't even mate.

I do not have the time to grab links and cite references, but most marine fish have spawned in aquaria. Aquaria is not just limited to hobbyist aquariums, it can be large outside pools like what is being done in Bali (who have reared quite a few new species, including several angels) to places like public aquariums.

I suggest you do some research on the subject, the Rising Tide Initiative would be a great place to start.

http://risingtideconservation.blogspot.com/

http://www.advancedaquarist.com/blog/the-exciting-breeding-work-of-rising-tide-conservation

http://www.bali-aquarich.com/article1.html
 
Yup I have heard of the koran angelfish success. Interesting to note that Frank has had morays spawn. I know there was an aquarium that had ribbon eels mate but the male was not producing viable milt while the female produced eggs. Did he successfully encounter any fertilisation?
 
Bill is right.;).
FW fish could be easy or difficult to spawn.Some so hard that hormones must be used.But after you have them spawned,raising the larvae doesn´t give much of a problem.
The opposite happens with SW fish,they spawn easily,given the right conditions.But the larvae frequently are difficult to impossible to raise.
And among those difficult to raise larvae,eels could be the hardest,they have a weird stage called leptocephalus,which lasts a long time before settling.Japanese researchers have invested lots of funds and efforts trying to breed their eels and they failed until recently.
Yes,Frank M.(former moderator of this Forum)had some morays spawning.
But you should see this anthological link where Amy D.shows her experience breeding ghost moray eels:
http://www.marinebreeder.org/forums/viewtopic.php?f=215&t=5849
 
Very very interesting and thanks for the link! I'm trying to breed yellow brotulas, flashlight fish and orange spot filefish. Do fry in general always need live food, or can things like rotifeast or marine snow be used to feed them?
 
Afraid not. Very few marine larvae will take anything other then live.

If you were doing Cobia, Roti-Feast would be fine, but mainly due to how rough you can be with the larvae (to keep the Roti-Feast in suspension).

Look for Matt Pedersen's posts on the Orange Spot File Fish aka Harlequin Filefish.
 
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