Herbivorous Crayfish? - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 04-01-2020, 10:10 AM Thread Starter
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Herbivorous Crayfish?

I had a crayfish years ago, more than 10 years ago. When it was young, it loved eating meaty foods. As it got older, it preferred foods with a higher vegetable content. What species of Crayfish might that have been?

Are there any Crayfish that are mostly Herbivorous?

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post #2 of 11 (permalink) Old 04-01-2020, 11:13 PM
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That eating pattern is fairly common in the animal kingdom. Most need more protein as they grow and less when completely grown. You see the same pattern in animal feeds. I raise chickens, and the feeds for the younger chicks are higher in protein. Once they reach maturity, they switch out to either maintenance feed or egg-layer feed which is enriched with calcium for the eggshells. Dog food is another example, that's why you see age-specific feeds.
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post #3 of 11 (permalink) Old 04-01-2020, 11:19 PM Thread Starter
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Yep . . . many animals need more protein as they grow.

So . . . what species of crayfish are less likely to eat fish as adults in comparison to other crayfish species?

Are there any Crayfish that are mostly Herbivorous?

.

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post #4 of 11 (permalink) Old 04-02-2020, 12:17 AM
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Yep . . . many animals need more protein as they grow.

So . . . what species of crayfish are less likely to eat fish as adults in comparison to other crayfish species?

Are there any Crayfish that are mostly Herbivorous?

.

It's really hard to say, most crawfish species are omivores/scavengers. They're pretty opportunistic eaters. Given a chance for a fish, I think most species will take one.


I've only kept a couple species, Procambarus clarkii and Marbled (Marmorkreb) but I can say there was never a point in their lifespan that they would not take a fish given the opportunity. Perhaps there are some other species that will work for you. Hopefully someone with some more experience with some of the dwarf species like CPOs will chime in.
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post #5 of 11 (permalink) Old 04-06-2020, 07:02 PM
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Quote:
Originally Posted by Acro View Post
I had a crayfish years ago, more than 10 years ago. When it was young, it loved eating meaty foods. As it got older, it preferred foods with a higher vegetable content. What species of Crayfish might that have been?

Are there any Crayfish that are mostly Herbivorous?

As far as I know, all crayfish species are oppurtunistic omnivores. This is why they are such critical species in the food chain. They turn "junk" into animal meat.
I've seen a lot of crayfish that live in areas with very limited fish(prairie crayfish). This doesn't mean they wont kill/eat fish, it just isn't their typically environment. They will all catch and eat fish, if given the opportunity. Some of them may have super small pincers(shrimp crayfish) or are enormous(Tasmanian giant crayfish), however, they will all grab a fish if possible.

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post #6 of 11 (permalink) Old 04-07-2020, 02:06 AM Thread Starter
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Wish I knew what crayfish species I had before. I know it ate fish when young but when it became an adult, it lost much of it's interest in fish.

I just remember having a bunch of frozen fish pieces (that became useless). I would thaw one out and feed it to the crayfish (with tongs). The crayfish would grab the fish, then drop it. I tried offering live fish, no interest. So whatever species of crayfish this was, wouldn't catch and eat fish, when given the opportunity.

It would only eat pleco type sinking wafers as an adult. Didn't want frozen or live fish. Wish I knew what species it was . . . maybe it was just specific to that individual crayfish.

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post #7 of 11 (permalink) Old 04-07-2020, 03:49 AM
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Do you have any type of identifying details other then what it decided to eat?


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post #8 of 11 (permalink) Old 04-10-2020, 02:01 PM
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Probably one of the Cherax species from Papua New Guinea.

Questions on Cherax Boesemani Care - Crays and Other Inverts - The Shrimp Spot

https://www.garnelio.de/blog/krebse/...ng-im-aquarium
This link is in German but you can easily translate it with google.

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post #9 of 11 (permalink) Old 04-10-2020, 02:29 PM
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Wish I knew what species it was . . . maybe it was just specific to that individual crayfish.
I think this is likely the case. I've kept several over the years (blue crayfish and regular old "feeder crayfish") and have noticed that some are more easy going than others. Some coexisted well and some did not. Some mowed every plant down, some left them alone. As far as I knew they were all the same species. I've heard bettas also exhibit widely different "personalities" like that. But even if you have a chill crayfish, there's no real guarantee it won't turn on a fish if given the right opportunity

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post #10 of 11 (permalink) Old 04-10-2020, 02:33 PM
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Are there algae eating crayfish. I think they are more carnivore than herbivore. When I kept dwarf Mexican crayfish, I had trouble with algae as I couldnt keep cherry or Amazon shrimp together as algae grazer for fear of becoming prey. Even some snails I kept became snack for the crayfish.
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post #11 of 11 (permalink) Old 04-10-2020, 02:45 PM
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Are there algae eating crayfish. I think they are more carnivore than herbivore. When I kept dwarf Mexican crayfish, I had trouble with algae as I couldnt keep cherry or Amazon shrimp together as algae grazer for fear of becoming prey. Even some snails I kept became snack for the crayfish.
Algae, not as likely. Algae wafers, sure. I've definitely had some devour live plants though. Even java ferns and Anubias leaves. I don't have experience with the dwarf Mexican, but I like the term used earlier "oppurtunistic omnivores" for the larger ones

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