Earth Hour: Turn Off the Lights!

[petros]

Oh probably. My interests are more in the physiology and biochemical aspects of fish health and homeostasis. I did have a few labs in aquacultural engineering that dealt with body shapes. For the most part, that class was focused on designing rearing systems.

My thesis which is due very soon is titled:

Evaluating the effect of supplemental astaxanthin in the feed of rainbow trout, Oncorhynchus mykiss L., on the stress response following an acute stressor.

Turned out very well. Still have to analyze the plasma cortisol, but I found significant effect of pigment on blood glucose levels. An unanticipated effect was also found, flesh colour deteriorated over the course of the stress response. Have some good references on that now, should be a very good discussion. I was a little dismayed that there were no effects at 6 weeks. It seems like 12 weeks was needed to build up adequate amounts of the pigment in the flesh.

Question about the food pellets. At one of my favourite fishing holes there is a commercial trout interest who had a pen failure and now the lake has mixed species. The former penned in fish seem to be addicted to the pellets which makes for great bait to catched the bred stock but the wild trout don't seem to go for it at all. Is it an added chemical they like or an oil from a specfic species in the pellet? It would be a great place to collect data between commercial and now wild commercially spawned fishes.

 

[petros]

In terms of identifying the catalyst to warming periods, if I had the definitive answer to that, we wouldn't be having this discussion, would we?

Why don't you posses that common knowledge?

 

[L Gilbert]

Who made the pellets and what are the ingredients?

 

[Tonington]

Are you able to (definitively) capable of pointing to man-made emissions as a primary causasl factor?... How realistic are the underlying assumptions and statistical model upon which you base your conclusions?

Very realistic. Unless you happen to think Planck's law is somehow flawed.

 

[EagleSmack]

Who made the pellets and what are the ingredients?

LMAO.

Yes... I'd like to know as well. Explain in detail the manufacturing process... each step.

 

[petros]

Let me put the question to you in alternate terms: How is the climatic system different today when compared against the spectrum of repeated incidences of fluctuations on the globe evidenced through the paleo-climatological record?.. Are you able to (definitively) capable of pointing to man-made emissions as a primary causasl factor?... How realistic are the underlying assumptions and statistical model upon which you base your conclusions?

The bulk of earth's history has been spent glaciated after a a major cosmological catatrophy that takes out 99% of life each time. Those are well known.

Other than man what is causing this latest mass extinction? The moose?

You claim it is cyclical so give it your best shot and start naming these cycles.

 

[EagleSmack]

There is a mass extinction going on?

 

[captain morgan]

Why don't you posses that common knowledge?

This 'common knowledge' you refer too... Is this the same common knowledge that is woefully incomplete?... Perhaps you can communicate with NASA or the UN and set them straight, maybe they didn't get the original memo. Certainly they would appreciate this knowledge.

 

[Tonington]

Question about the food pellets. At one of my favourite fishing holes there is a commercial trout interest who had a pen failure and now the lake has mixed species. The former penned in fish seem to be addicted to the pellets which makes for great bait to catched the bred stock but the wild trout don't seem to go for it at all. Is it an added chemical they like or an oil from a specfic species in the pellet? It would be a great place to collect data between commercial and now wild commercially spawned fishes.

There are attracatants in the feed, which make it more palatable. The oils added to the feed help to bind fine ingredients, and fats happen to be more energy dense (and cheaper than proteins).

The hatchery raised fish are conditioned to eat the pellets. The wild fish likely don't recognize it as a prey item, even with the attractants. You can attract hatchery fish by throwing a bunch of pebbles into the lake. They are not only conditioned to the shape, but to the sound of the food breaking the water surface. In wild fish, this likely initiates a flight response.

 

[L Gilbert]

LMAO.

Yes... I'd like to know as well. Explain in detail the manufacturing process... each step.

hehehe
Pretty hard to say why the farmed fish like it and the wild ones don't unless you know what's in it. Or perhaps wild fish simply like fresh meat (bugs n whatnot).

 

[L Gilbert]

There is a mass extinction going on?

Lots of species are dying off, yes.

List of extinct mammals - Wikipedia, the free encyclopedia

List of extinct birds - Wikipedia, the free encyclopedia


Notice the dates of the last sightings.

 

[petros]

This 'common knowledge' you refer too... Is this the same common knowledge that is woefully incomplete?... Perhaps you can communicate with NASA or the UN and set them straight, maybe they didn't get the original memo. Certainly they would appreciate this knowledge.

Oh so it's NASA the UN and lemme guess NOAA behind the conspiracy? What about the Catholics or perhaps it's the royal family? They seem to be pushing this heavily. Is the Queen the one behind it all?

Let me ask you this. How much of the northern hemisphere was covered in the Wisconsonian glaciation? I start you out, the Wisconsonian was the last one. Where did it cover and what ended it so rapidly?

It is indeed known what happened and it had nothing to do with NASA or the UN.

What do YOU think it was?

 

[Tonington]

Who made the pellets and what are the ingredients?

We purchased commercial trout pellets from Corey Aqua Feeds. Specifically, their extruded "5 AquaSea" formulation. It's guaranteed analysis is crude protein min.50%, Crude fat max 14%, crude fibre max 1.4%, Phosphorous actual 1.2%, Sodium actual 0.6%, Vitamin A min 2500 IU/kg, Vitami D3 min 2400 IU/kg, and Vitamin E min 200 IU/kg.

There's much more detailed lists available from the manufacturer, but they won't give you the actual diet formulation. They give you the list of ingredients on request, and if you know your stuff you can sort of work your way backwards, using a model!

For my diets, I ground the pellets down to a fine mixture using the hammer mill at my school. Then I mixed the two treatments into two third of the ground material, and left 1/3 for the control. Then I took the mixtures to the National Research Council in Halifax, and steam pelleted the mixture. I had to make multiple trips, because I had about 250 kg's and their facility can only pellet about 45 kg per day. I ended up making two different pellet sizes to accomodate the change in mouth size as the fish grew.

 

[petros]

I'd wager it's something in that Crude fat max of 14% that makes them go gaga?

 

[petros]

Here is write up of "my fishin' hole" and it's world record rainbows: Trophy Trout Guide - Your Source for All Things Trophy Trout!

[FONT=Arial, Helvetica, sans-serif][SIZE=-1]

[FONT=Arial, Helvetica, sans-serif][SIZE=-1]The Lake Diefenbaker system is a giant lake of 430 square kilometers that is over 225 Kilometers long. It features walleye and rainbows as the main species. A commercial fish farm that has raised triploid rainbows for at least the past 20 years is one of the sources of the monstrous trout that inhabit the lake system. There is also some native fish and natural reproduction to a lesser degree. As the story goes, about 500,000 triploids escaped through a hole in the net pen made by an ice flow about seven years ago. With “perfect storm” conditions of forage and ideal water temps, these trout are common at 20 LBS., with several fish caught each year in the 30 LB. range and of course, we now know that there was at least one “mother of a trout” in there that exceeded 40 LBS.!![/SIZE][/FONT]

[/SIZE][/FONT]

 

[Tonington]

I'd wager it's something in that Crude fat max of 14% that makes them go gaga?

The oils are highly palatable. But it's really a combination of factors. Krill hydolysate for example is a collagen intermediary that is a highly palatable, and attractive protein for the fishies. Also, some companies use molasses. It's excellent at binding larger particles together, and is also a highly digestible source of carbs. Trout don't utilize carbs that well, but molasses is one of the exceptions.

 

[Tonington]

Here is write up of "my fishin' hole" and it's world record rainbows: Trophy Trout Guide - Your Source for All Things Trophy Trout!

Ahh, triploids. I was a little concerned at first that there may be wild and farmed genes mixing together in that lake. But it's much less likely with triploids. Granted, there will be some diploids that make it through the treatment process for producing triploids. So, that's still a concern, though not quite as bad.

 

[L Gilbert]

lol We have largish rainbows in Kootenay lake, too. Many 30+ pounders have been taken out.

Anyway my opoint in asking who made the pellets and what was in them was to point out there is insufficient data to make a reasonable postulation as to why the farmed fish go for it and the wild ones don't.

 

[EagleSmack]

Lots of species are dying off, yes.

List of extinct mammals - Wikipedia, the free encyclopedia

List of extinct birds - Wikipedia, the free encyclopedia


Notice the dates of the last sightings.

Hardly a mass extinction though.

 

[L Gilbert]

Hardly a mass extinction though.

:rollidja notice those were only among birds and mammals? There are also reptiles, amphibians, insects, plants.