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PostPosted: Nov 11th, '17, 02:31 
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PLJ,

Are Brown Trout any better eating than Rainbow Trout?

I don't think they feed as well as Rainbow Trout and wouldn't grow fast enough here in my small volume of water to beat the warmer weather for me to try them.

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PostPosted: Nov 13th, '17, 00:24 
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G'day Joblow, at the rate I'm going I may not get to compare the eating qualities of browns and rainbows. :cry: I've lost four trout in the last 36 hours to rising water temps as a result of the recent heat and one of them was a brown trout. He scarcely weighed 100g, I reckon. Hopefully one or more of the half dozen unaccounted for browns is packing on some meat and will be caught before she dies of the heat.

The other day I had a couple of dead trout in my holding tank. Normally I scoop the fish out of the big tank with a net in order to stockpile in my holding tank the quantity I need a day or two in advance. I couldn't net any so I resorted to my trusty little Ugly Stick to catch 10 fish. Any trout that were gut-hooked I dispatched immediately but those that appeared to be only lightly lip/cheek-hooked I put into the holding tank - a total of eight. I noticed the two dead fish about 36 hours after they had been caught on a hook, therefore 25% of the 'lightly' hooked trout, that I felt confident would survive their capture, died of their injuries.

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PostPosted: Nov 13th, '17, 00:36 
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This is a non-resilient brown trout that succumbed to rising water temperatures.


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PostPosted: Nov 13th, '17, 09:18 
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Thanks for the answer & photo PLJ, you don't want to try that dead one and get back to me do you? :laughing3:

It hurts when you get them up to full size and then lose them to water temps, I'm battling it here at the moment.

I pull shade cloth around the grow beds with a mist spray and that get the water temp down to 10c -11c below the ambient temperature but if we have 2 or 3 real hot days in a row the overnight temperature is the thing I can't beat.

When the water in the fish tank is 20c at 6:30am - 7:00am and you're looking at a 30c - 35c day you're fighting a losing battle and my 2,000 litres of water would be a lot easier to drop the temperature down a little than the large volume of water you have, once the volume of water you have got hot it would be near on impossible to drop any water temperature at all.

A small Waterwheel might do some good in your big tank, you've got the space to run one, it might save a few fish.


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PostPosted: Nov 13th, '17, 12:23 
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PLJ it looks like I'll be OK again this week, 3 warm days, 33c, 32c, 31c and then 18c. The overnight temperatures aren't too bad, 19c, 22c, 15c, the fish tank temp was 19.c at 8:50am and it hit 21.4c at 2:00pm when the ambient temperature was 32c and it's still 21.4c at 3:15pm so I'm OK for today.

I added a 65 litre air pump running 4 x air stones to help the fish a little more.

Your weather in Perth this is not too bad with pretty good overnight temps.


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PostPosted: Nov 14th, '17, 00:51 
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Thanks for the waterwheel suggestion, Joblow; I'll look into it. You're right, altering the temp of my system would be difficult due to its large thermal mass.

It looks like the overnight temps over your way will help keep your fish alive this week. My place is 100km north of Perth so it's typically a couple of degrees warmer up here in summer, and correspondingly cooler in winter.

I often eat floaters but draw the line at tiddler floaters, even if they are Brown! I'll bank on catching one alive and of a reasonable size.

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PostPosted: Nov 14th, '17, 06:11 
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The overnight temperature is still a bit of a challenge, the water temp at 1:00am this morning was 22.8c and 21.3c at 6:00am, I managed to drop it back to 20.6c by hosing and misting but tonight could be a bit harder if it doesn't drop overnight.

Starting the day off at 20.6c is a full degree hotter than yesterday so I'll need to be on top of it again today.

PLJ here's a shot of Buxton Trout Farm's water wheels, they provide plenty of aeration and I would think a touch of cooling with the mist. Buying out of China they are not that expensive, or even build something yourself with a motor mounted on the wall of your tank.
https://www.alibaba.com/product-detail/ ... 50739.html

Talking about floaters, these are pictures of the Trout Farm's dead fish after the "Black Saturday" bushfires.


Attachments:
Buxton Trout Farm (Small).jpg
Buxton Trout Farm (Small).jpg [ 119.65 KiB | Viewed 1963 times ]
Trout being buried (Small).jpg
Trout being buried (Small).jpg [ 120.82 KiB | Viewed 1963 times ]
Dead Trout (Small).jpg
Dead Trout (Small).jpg [ 110.77 KiB | Viewed 1963 times ]
40 tonne of dead fish (Small).jpg
40 tonne of dead fish (Small).jpg [ 76.74 KiB | Viewed 1963 times ]

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PostPosted: Nov 14th, '17, 15:51 
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It doesn't really matter how much you agitate the surface to add O2, if it is already at saturation, it can't add any more, and in the low-mid 20's C you are at the limit for trout. The solubility of Oxygen rapidly decreases with increasing water temperature, so really the only way to keep them alive if the water temp is going high in hot weather, is to cool the water.
I managed to run trout all through last summer with the use of a chiller, and plan to do so again this year, but it can be a challenge when the max air temps are over 40C.

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PostPosted: Nov 14th, '17, 17:03 
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Gordon, what size is your chiller and is it single or 3 phase?

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PostPosted: Nov 14th, '17, 17:56 
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Single phase, I run it from a 15A outlet. It's a nominal 2HP, but actually uses about 2kW of power when running. It does have decent PF correction though, so isn't working my inverter harder than necessary. In hot weather I start it early in the morning when the ambient temps are cooler, which gives it a better COP than in the afternoons when it is hot.

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PostPosted: Nov 14th, '17, 18:03 
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I wonder if earth piling against the northern face, and a coat of white emulsion would make any difference to the temps in PLJ's giant concrete tank?

I guess trees and bushes for shade would help in the long run too, but perhaps its all rather a lot of effort for a mere degree or two?...


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PostPosted: Nov 15th, '17, 07:57 
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Thanks Gordon, I should have asked a brand & model number, but I'm thinking it will be beyond my budget.

Power is not a problem our solar panels are producing twice as much as we use and Friday we are having 3 x split systems added to the house and ditch our gas central heating.

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PostPosted: Nov 15th, '17, 10:22 
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It was the 2HP version of this: http://www.aquasonic.com.au/product/wat ... 240v-50hz/
I can't remember what I paid for it now, but it was fairly expensive. However, this range of chillers had a much better COP than any others I saw, so does a lot more water chilling per dollar spent, and per kWh used, which is important for me, being off-grid.

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PostPosted: Nov 15th, '17, 12:17 
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Thanks for that, I'll do a bit of searching and way it all up to see how far I go next year, if I'm to get serious or just stay a tyre kicker

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PostPosted: Nov 15th, '17, 13:56 
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Those dead trout images are horrific, Joblow. They certainly put my occasional losses in perspective.

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