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Re: [GSAS-Member] Safe in Tank Acrylic Sandpaper





From: haika@drizzle.com
Reply-To: Greater Seattle Aquarium Society member chat<gsas-member@thekrib.com> To: "Greater Seattle Aquarium Society member chat" <gsas-member@thekrib.com>
CC: gsas-member@thekrib.com
Subject: Re: [GSAS-Member] Safe in Tank Acrylic Sandpaper
Date: Wed, 6 Apr 2005 09:33:36 -0700 (PDT)

> Are there any old fish in the wild?)

If an age of 100+ can be defined as 'old'...yes, we encounter them on a
routine basis. Of course, I'm talking about fish in a marine ecosystem
rather than freshwater. Dover sole, sablefish (black cod), and several
rockfish (Sebastes) spp routinely exceed 60 years of age. Our lab has
validated these age estimates with radiometric analysis. Just last week I
looked at an otolith preparation from a rougheye rockfish that we
estimated was 100+ years old (I got 101, another age reader got 104). We
are preparing a thin-section of this otolith just to cross-check our
estimate.

Betty Goetz

O.K. I should've been more specific. Old freshwater fish that we would could reasonably expect success with, in a home aquarium environment. This rules out sturgeon, lungfish (can be kept as pets but not yet bred in captivity, which is my partial criteria for success.)

Old doesn't mean years- most killifish live for several years in captivity, including some of the so-called annual killifish whose lives are as long as the duration between the rainy season and the dry season in their native habitats. So, a 1.5 year old Cynolebias (have had those myself) are 50% older than they'd expect to be in nature.

Matt

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