Colorado Fisherman Forum banner
1 - 6 of 6 Posts

· Registered
Joined
·
3,592 Posts
The smaller lake trout in Granby feed primarily on Mysis shrimp, not plankton and are in good shape. I talked to Ester at Northern water and they are doing an isolated study on water enrichment at Willow cr. but as a water quality manager she said they work hard to remove the algae and clean up the water so I don't think we will see planes flying low while they fertilize our reservior any time soon. That leaves Granby dependent on Environmental conditions that creates poor conditions for Kokanee in times of extended high water conditions. The lake trout do just fine on a mysis diet but they seem to get hung up at 19" and 20" on the mysis diet and quit growing. This is a good thing otherwise we would have Blue Mesa's problems of fish growing too fast. I have noticed 2 different specie's of lake trout at Granby, the darker colored ones found mostly suspended seem to be the ones that grow faster. Some parts of the lake the large fish are doing better than others. The ones that have adapted to living deep feeding on their siblings are doing just fine. Here's a picture of one I caught the other day that wiggled out of the mouth of a large one. With Rainbow stocks down to an all time low at Granby and 2 hatcheries down due to fires. Rifle is hard pressed to get enough stockers out. Our rainbow fishery has suffered due to this and the Kokanee have done poorly the last few years due to the water conditions. Some of the large lake trout are thinner now and thats expected but they still provide opportunities and will be fine. This same thing happened in 99. When the forage base bounces back they will gain weight accordingly but some will always be lean and others have better girths. I'm working now on compiling all the rainbow stocking data at our lakes to get a look at what we are getting per surface acre compared to other large reservoirs. Lakes without Mysis like Green and Willies the small lakers feed on plankton and we see similar growth struggles with few getting past the magic 18" to 20" size.
 

· Registered
Joined
·
3,592 Posts
I have mentioned to Ewert about the different species that have adapted in Granby and he didn't think there would be major differences but the darker suspended fish have obvious differences. When the lake trout were originally stocked in the 60s A lake trout was a lake trout and I doubt they have ever done much studies here on the Phenotypes.
 

· Registered
Joined
·
3,592 Posts
Turquoise and Twin are good managed fisheries and the lakers do good without Kokanee. When the lakes were built they dedicated a hatchery to them. Granby gets stocked from Rifle and they didn't think about the need for a hatchery nearby at the time the lake was developed.
 

· Registered
Joined
·
3,592 Posts
So was the recommendation to stock deep water sculpin ever attempted at Granby? Page 8 under recommendation in the link.

Also which type of Artic Char are being stocked in Dillon...It seems to make a huge difference in Mysis control...and for the growth of the Char. Page 7 in the link..bottom left hand..

Sorry only some parts of this PDF are allowing me to copy and paste using my limited computer skills.

Study from 1987 ...very interesting..Proposed Biological Management of Mysis relicta in
Colorado Lakes and Reservoirs PATRICK J. MARTINEZ

http://wildlife.state.co.us/SiteCol...ications/ProposedBiologicalManagement1989.pdf
Jake went to Wisconsin for a meeting on that about 20 years ago when Martinez had that theory going but they never could figure out how to get them out of deep water from lake michigan without damaging them and gave up on the idea. The lake trout eat the Mysis anyway so having them go from mysis to sculpin to lake trout may not have changed much.
 

· Registered
Joined
·
3,592 Posts
I think it would help a lot. It says those sculpin feed almost entirely on mysis...don't compete for zooplankton...live on the bottom and lake trout feed heavily on them...They also don't move from lake to lake and they grow to 9 inches. May allow the kokes to come back...since the kokes compete with the mysis.

That's if you can get them...
Good work Hobie, I was just relaying Jake's comments but that would be something to try and get going. I would send all that research info and questions to Ewert at [email protected] thanks for pulling up the info.
 
1 - 6 of 6 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top