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Fish news and info I found

Started by Guest_FirstChAoS_* , Jun 27 2012 02:33 AM

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56 replies to this topic

#21 Guest_fundulus_*

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Posted 21 February 2013 - 03:37 PM

In principle, yeah. One limiting factor is that the good steroids like 11-KT are a controlled substance that, strictly speaking, you need a federal license to possess and use. The dosage required is pretty low; in a preliminary experiment we found that adding 70 nanograms (billionths of a gram) to a 10 gallon aquarium appeared to stimulate greater growth in juvenile scarlet shiners than treatments with 30 nanograms and zero nanograms. This wasn't really publishable, with two replicates of each treatment and 4-6 individuals in a tank. My guess is that similar exposure would jack up color and behavior in adults.

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#22 Guest_Kanus_*

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Posted 21 February 2013 - 04:49 PM

Oh wow. I was kidding because I had no idea you had done this in an aquarium setting. Very cool stuff. I know carp hormonal extracts are sometimes used in hatcheries by injection to spawn fish. Do you happen to know if those are useful as an additive to the water, or do they need to be injected? I wonder if this kinda stuff could be used to make spawning imperiled small nongame fish a bit less labor intensive for propagation efforts.

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#23 Guest_fundulus_*

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Posted 21 February 2013 - 05:39 PM

With small fish, like juvenile scarlet shiners, injections are pretty tricky business. Experimental work with various steroids usually depends on gill uptake rather than injections. Of course, with adult carp, it's no problem with injections because they're so big.

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#24 Guest_EricaWieser_*

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Posted 21 February 2013 - 06:39 PM

I've actually been wondering if Bruce has come up with the proper dosage and synthesis techniques for 11-ketotestosterone usage in aquaria. I think there would be a small dedicated market (especially within NANFA) for a powder that could be added to our tanks to cause breeding coloration on-demand. Maybe have a bottle with before and after pictures of a Tennessee shiner, and call the product Silver-No-More. Eh, Bruce?

I would buy it. No, seriously. There are so many shiners I don't have because they're all silver in real life.

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#25 Guest_FirstChAoS_*

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Posted 14 March 2013 - 12:09 PM

A drying stream threatens a threatened population of steelhead trout in California. My first thought was "this is bad and newsworthy". My second thought is "rainbows are mass farmed, can't they be replaced?" My third thought on this was "what about the other species in the drying river?"

http://baynature.org...alo-alto-creek/

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#26 Guest_FirstChAoS_*

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Posted 29 March 2013 - 01:54 PM

Trout gorges and starves the rest of the year

http://www.livescien...guts-gorge.html

Blind cavefish also hearing impaired

http://www.livescien...aring-loss.html

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#27 Guest_FirstChAoS_*

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Posted 02 April 2013 - 01:25 PM

giant smelt? this looks like an April fools joke with poor photoshopping. http://californiawat...south-of-delta/

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#28 Guest_Kanus_*

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Posted 02 April 2013 - 04:21 PM

Bahaha that's a good one. I think they should get me to do their photoshopping next time though.
Posted Image

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#29 Michael Wolfe

Board of Directors

North Georgia, Oconee River Drainage

Posted 02 April 2013 - 04:31 PM

^{Jump to about 4:10 of this classic and let it play to the end...}

Either write something worth reading or do something worth writing. - Benjamin Franklin

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#30 Guest_gerald_*

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Posted 02 April 2013 - 06:52 PM

Derek in a suit & tie? Wow that IS some adept photo-shopping.

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#31 Guest_FirstChAoS_*

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Posted 03 April 2013 - 02:33 AM

Derek in a suit & tie? Wow that IS some adept photo-shopping.

That must be it, as I seen minnows nearly that big in nature so that's not too unusual.

I re-read the delta smelt article and can't beleive i missed the best joke in it the first time "pier reviewed".

Edited by FirstChAoS, 03 April 2013 - 02:39 AM.

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#32 Guest_Kanus_*

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Posted 03 April 2013 - 06:29 AM

Haha this was for my interview for the new job. I wanted to show the biologists that I could rustle up the biggest, finest satinfin shiner they'd ever seen!

And I reread the article last night and caught a few pretty funny tidbits in the text too. That was a good one :-)

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#33 Guest_FirstChAoS_*

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Posted 05 April 2013 - 11:00 PM

Apparently fish have stowed away on tsunami debris, which i guess gives those on the west coast the strangest sampling opportunities yet.

http://www.livescien...ml?cmpid=514627

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#34 Guest_scott361_*

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Posted 06 April 2013 - 01:10 PM

Yeah! So much of the debris is ending up here. I keep seeing reports on my local news. I saw that one last night.
I'm not that far from the Southern Oregon coast (as the crow flies) and I have been going over every couple of weeks.
The dogs like to play on the beach and it gives me a break.
I haven't seen very much that I could attribute to as coming from there. The beaches are pretty clean looking around here.
I did see an old propane tank on my last trip, but it could've been from anywhere. There were no markings that I could see.
We've been having late storms sweeping through and they toss a lot of things around.
Some glass floats would be really cool to find!

(There is a reason why I take potassium iodide every night! If nothing else, I'm healthier taking it and I've lost a lot of my grey! :biggrin:

Even if they haven't played down the radiation issues, I'm better for it regardless!)

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#35 Guest_FirstChAoS_*

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Posted 15 April 2013 - 09:44 AM

Most of the eels tagged in an effort to study their migration have been eaten by poorbeagle sharks, It seems the sharks know where the food is concentrated and take a heavy toll on migrating eels.

http://www.scienceda...30312121110.htm

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#36 Guest_FirstChAoS_*

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Posted 16 April 2013 - 09:22 AM

I was just thinking of that sharks and eels article I posted the other day. Since most of the tagged eels were eaten does that imply tagged fish or more vulnerable to predation? Or is it just predation in general is very high during migration when food is concentrated.

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#37 Guest_rjmtx_*

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Posted 18 April 2013 - 12:41 PM

...and that's part of the reason each female can produce millions of eggs.

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#38 Guest_FirstChAoS_*

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Posted 01 June 2013 - 12:34 AM

BP oil spill shows harmful effects on gulf killifish

http://www.livescien...es-nsf-ria.html

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#39 Guest_FirstChAoS_*

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Posted 26 July 2013 - 10:56 AM

A madtom species that was on the edge of extinction has been successfully reintroduced and is on its way to recovery

http://usfwsnortheas...ims-back-south/

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#40 Guest_EricaLyons_*

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Posted 26 July 2013 - 12:44 PM

Yay Endangered Species Act, Virginia Department of Game and Inland Fisheries, and Conservation Fisheries, Inc. This is a great story of different people working together to prevent the forever loss of a unique species. That put a smile on my face, thank you for sharing