Adipose body on pectoral fins of sexually mature Dianema and Hoplosternum?

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bekateen
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Adipose body on pectoral fins of sexually mature Dianema and Hoplosternum?

Post by bekateen »

Hello all,

I just read in the literature something about an "adipose body" on the pectoral fins of sexually mature male Dianema and Hoplosternum. I've never heard of this before. Does anyone have any info on this?

Thanks, Eric
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Re: Adipose body on pectoral fins of sexually mature Dianema and Hoplosternum?

Post by Bas Pels »

I think you intent us to guess what adipose would mean.

In Dutch the adipose fin is called vetvin, which would translate as 'fat fin'. This would make me translate adipose as thikened, fatty - and in Hoplosternum the first finray in the pectoral fin is thickened.

Problem is, in Dianema I neve saw this. Or did I only see females? I would be very surprized if that was the case. But then, perhaps the Dianema males I was never ripened to full maturity. I have to admit, I never saw a Dianema male which has bred.

But his is only my two cents.
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Re: Adipose body on pectoral fins of sexually mature Dianema and Hoplosternum?

Post by bekateen »

Hello Bas,

I didn't mean to be vague, except that I'm not familiar with any "adipose body" on the pectoral fins of some male Callichthyids. But given that the scientific article mentioned that hobbyists call the object ( a lump on the male's pectoral fin membrane,, between the pectoral spine and first ray) an adipose body, I was hoping that one or more hobbyists here would know about it.

Cheers, Eric
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Re: Adipose body on pectoral fins of sexually mature Dianema and Hoplosternum?

Post by MissNoodle »

Could it mean this....

My male hoplosternum punctatum
20200805_181912.jpg

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Re: Adipose body on pectoral fins of sexually mature Dianema and Hoplosternum?

Post by bekateen »

Thanks for the photo. I think it's bigger than that, and closer to the base.

Cheers Eric
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