Shipping anachronistic fish
Posted 19 August 2006 - 08:52 PM
Well you are all certainly familiar with Kordon Breathing bags? I add a breathing bag inside of the actual shipping bag filled with 100% O2. This bag floats on the water. I wrap several rubberband around the breather bag to pressurize the bag. The semipermeable breather bag slowly releases O2 into the bag for about 36 hours.
This allows for a very slow O2 enrichment that doesn't seem to shut down the surfacing reflex of our native airbreathers.
Posted 22 August 2006 - 10:44 AM
BTW, i just tried a fish transport experiment that worked quite well. ive often had trouble with wild-caught fish collected in late summer, presumably due to the double-whammy of heat and ammonia. This time i brought along a nice slimy polyurethane foam block taken from a filter on a well-established tank, let excess water run out but did NOT rinse it. I put the foam block in the styrofoam cooler with the newly-caught fish plus my usual 1 teasp salt per gal. (styro box with a black trashbag liner reduces snout damage). Much of the bacterial gunk fell out and muddied up the water, and the fish ALL did great: about 40 2-inch shiners and 2 darters in 3 gallons of water for 8 hours. 6 of those 8 hrs were WITHOUT aeration (car motion probably helped -- "officer, i was just trying to aerate my fish"). Next day all were happily eating, no cloudy fin edges, hazy eyes, or labored breathing. I'm gonna do this again !!.
gerald, hangin on the Neuse
Posted 22 August 2006 - 12:27 PM
Do toy think the "dirty" filter media has any advantages over, say, just a heavy dosing of Amquel and/or Polyaqua/Novaqua? I really believe the salt is a key here. This is an underutilized collecting tool. I don't think anyone should attempt to transport fish without it.
Just out of curiosity, what kind of salt do you prefer? I have always used marine salt because I can get it in bulk and have ahd a free supply for some time. I am about to run out though and wondered if the plain old aquarium salt might work just as well, or better. I have always been a little concerned about the buffering capacity of marine salt.
I also seem to remember that you advocated taking your own water with you into the field rather than using collection site water. Do you still do this? Why or why not?
Good to see you here.
Posted 22 August 2006 - 12:29 PM
What is your take on this?
Posted 22 August 2006 - 01:36 PM
i use Kosher salt, about 1 teasp/gal - plain NaCl has no effect on pH. with marine salt i'd be afraid of pH shock in blackwater, and ammonium to ammonia conversion. keeping it a little acid is probably safer in terms of ammonia risk.
i tried bring-my-own water a few times collecting in stagnant swamps & acid waters, (mixed about half & half) and it worked well for delicate species i'd previously had trouble with. But i havent done that in recent years & its probably not necessary IF you take other precautions. Now i use salt, and if collecting in swamps i scoop my take-home water BEFORE i start collecting. I figure the smelly gases (and maybe ammonium ??) that bubble out of swamp muck while i'm wading around might be an added stress the fish dont need on top of normal collecting stress. If you KNOW youre going to a place with poor water quality (urban or agric watershed) then i'd say yes, bring some good water from home or another stream.
gerald, hangin on the Neuse
Posted 22 August 2006 - 01:46 PM
The water in the breather bags keeps a very high level of O2. I do not have the means to check the specific levels, but I have shipped higher gradient shiner spp.(such as fieryblack) with several in a bag for several days with 0 loss of fish. It's hard for me to believe that an ambush predator like a bowfin, that spends most of its days sitting perfectly still, would have a problem staying well-oxygentated due to lack of water over its gills. I can see your point here as well, but I would prefer to remain cautious.
Good to hear another opinion on the salt. I suppose I never really considered the ammonia implications at higher pH. Thankfully, I haven't had an issue yet and have time to switch it up. What do you think about using any type of buffer in the transport water? I ask since pH is likely to drop a fair amount in an overcraowded transport container.
Posted 22 August 2006 - 02:53 PM
Skipjack on the otherhand has nearly if not a %100 live record with his method.
We live we learn.
I had no idea pure oxygen could shut them down
Posted 22 August 2006 - 06:59 PM
Posted 23 August 2006 - 09:19 AM
-Chip in SC
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