ID this in an abalone shell??

Hordearii

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Can anyone help me ID what is on this abalone shell??

PXL_20220816_232300427.jpg
 
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Hungrypede

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Liveaquaria pictures show similar to yours, perhaps a feature and not a bug.


Its been about a decade since we could harvest abalone on the California coast, but if I recall they have similar feelers coming out of the top.

Where’d you purchase from?
 
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Hordearii

Hordearii

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The large wholes are normal, it's the network of small holes between the two large holes on the right that I'm confused about. This is from J&L Aquatics in Burnaby, Canada.
 
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Hordearii

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Only a guess ,but some kind off eggs?
If so idk what,but could start by looking whats in your tank and research If lay eggs and if do what they look like .
Or really half guess = sponge but doubt it
This abalone was just introduced, nothing else that's been in the tank lays eggs, relatively new tank that just had trochus snails, but today added the abalone, 2 fighting conch, and 8 nassarius snails.
 
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Any idea if it has any beneficial or negative effect in the tank? Kind of creepy, but also cool looking
Given that they are filter feeders, phytoplankton dosing might help to keep them alive. This article states they are relatively benign:
http://reefkeeping.com/issues/2003-10/rs/index.php

Somewhat unrelated, but these cool looking "bryozoan cups" sometimes enter the trade:
1660704982641.png

1660705040382.png
 

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