04-29-2006, 07:48 PM
[black]Here’s what I found after reading several research reports on the F&G website as well as some from a google search. [/black]
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[black]I still couldn’t find any reports with conclusive evidence showing diploids are more aggressive than triploids. At the moment I’m not convinced that diploids are more “hook friendly” than triploids. Diploids do seem to be more vulnerable to fishermen during the spring spawn. This may be a good thing or a bad thing depending on who you talk to. [/black]
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[black]I have read several studies that show different strains of rainbows are more aggressive. One thing that I do believe without question is that a hatchery rainbow trout planted when it is 10”-12” is more aggressive than a wild rainbow trout in similar conditions.[/black]
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[black]It would take some very solid data to convince me that diploid rainbows pull harder than triploids. Some of the hardest pulling rainbows that I have caught are triploids. I’ve caught triploids out of several places that pull just as hard as a smallmouth bass of similar size.[/black]
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[black]At Henry’s Lake I have noticed a big difference after the F&G started planting triploids. Some of the fishing techniques that worked well for me in the 90’s just haven’t worked very well the last few years. I don’t believe this change has to do with the diploid/triploid factor. I believe it has to do with less fishing pressure, less fish and more forage available per fish. [/black]
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[black]Below are some of my comments on the two studies I found most interesting. The results from these two studies contradict each other, which backs up what bsflies said "[font "Verdana"][size 2]What happens in one body of water may not happen in another body of water."[/size][/font][/black]
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[black]#1 In this report the fish were caught by gill net and electrofishing. It doesn't mention anything about rod and reel catch rates. Here’s some quotes from the report. [/black]
[black]“In both reservoirs, relative survival was significantly higher for triploid fish. The final catch proportions (triploid:diploid) were 1.4:1 in Treasureton and 1.9:1 in Daniels”[/black]
[black]“At age-1, mean length and weight values were similar for the triploid and diploid fish. During the second year, however, diploid growth was significantly higher than triploids. The trend reversed as the diploid fish reach sexual maturity. Age-3 and older triploids caught or exceeded diploid fish in length but not weight.”[/black]
[black]“Triploid rainbow trout demonstrated a benefit in relative survival, but no consistent growth advantage was found.”[/black]
[black][url "https://research.idfg.idaho.gov/Fisheries%20Research%20Reports/Volume%20130_Article%2008.pdf"]https://research.idfg.idaho.gov/Fisheries%20Research%20Reports/Volume%20130_Article%2008.pdf[/url][/black]
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[black]#2 This study showed a significantly higher (1:12) rod and reel catch rate for diploids in high mountain lakes around McCall. According to gill net samples, diploid survival was 4 times greater than that of triploids. The sample size for the 12 to 1 rod and reel catch ratio was only 13 fish. The small sample size makes the rod and reel catch ratio statistically inconclusive. Growth rates comparing triploids to diploids in these high mountain lakes showed no statistical difference. The only conclusive data this report showed was survival of diploids was better than triploids for these lakes during the years sampled.[/black]
[black][url "https://research.idfg.idaho.gov/Fisheries%20Research%20Reports/03-44%20Kozfkay%202002%20Hatchery%20Trout%20Eval.pdf"]https://research.idfg.idaho.gov/Fisheries%20Research%20Reports/03-44%20Kozfkay%202002%20Hatchery%20Trout%20Eval.pdf[/url][/black]
Anyway that is my 2 cents. Don't forget to post a link for the rest of us if you find interesting research on this subject.
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[black]I still couldn’t find any reports with conclusive evidence showing diploids are more aggressive than triploids. At the moment I’m not convinced that diploids are more “hook friendly” than triploids. Diploids do seem to be more vulnerable to fishermen during the spring spawn. This may be a good thing or a bad thing depending on who you talk to. [/black]
[black] [/black]
[black]I have read several studies that show different strains of rainbows are more aggressive. One thing that I do believe without question is that a hatchery rainbow trout planted when it is 10”-12” is more aggressive than a wild rainbow trout in similar conditions.[/black]
[black] [/black]
[black]It would take some very solid data to convince me that diploid rainbows pull harder than triploids. Some of the hardest pulling rainbows that I have caught are triploids. I’ve caught triploids out of several places that pull just as hard as a smallmouth bass of similar size.[/black]
[black] [/black]
[black]At Henry’s Lake I have noticed a big difference after the F&G started planting triploids. Some of the fishing techniques that worked well for me in the 90’s just haven’t worked very well the last few years. I don’t believe this change has to do with the diploid/triploid factor. I believe it has to do with less fishing pressure, less fish and more forage available per fish. [/black]
[black] [/black]
[black]Below are some of my comments on the two studies I found most interesting. The results from these two studies contradict each other, which backs up what bsflies said "[font "Verdana"][size 2]What happens in one body of water may not happen in another body of water."[/size][/font][/black]
[black] [/black]
[black]#1 In this report the fish were caught by gill net and electrofishing. It doesn't mention anything about rod and reel catch rates. Here’s some quotes from the report. [/black]
[black]“In both reservoirs, relative survival was significantly higher for triploid fish. The final catch proportions (triploid:diploid) were 1.4:1 in Treasureton and 1.9:1 in Daniels”[/black]
[black]“At age-1, mean length and weight values were similar for the triploid and diploid fish. During the second year, however, diploid growth was significantly higher than triploids. The trend reversed as the diploid fish reach sexual maturity. Age-3 and older triploids caught or exceeded diploid fish in length but not weight.”[/black]
[black]“Triploid rainbow trout demonstrated a benefit in relative survival, but no consistent growth advantage was found.”[/black]
[black][url "https://research.idfg.idaho.gov/Fisheries%20Research%20Reports/Volume%20130_Article%2008.pdf"]https://research.idfg.idaho.gov/Fisheries%20Research%20Reports/Volume%20130_Article%2008.pdf[/url][/black]
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[black]#2 This study showed a significantly higher (1:12) rod and reel catch rate for diploids in high mountain lakes around McCall. According to gill net samples, diploid survival was 4 times greater than that of triploids. The sample size for the 12 to 1 rod and reel catch ratio was only 13 fish. The small sample size makes the rod and reel catch ratio statistically inconclusive. Growth rates comparing triploids to diploids in these high mountain lakes showed no statistical difference. The only conclusive data this report showed was survival of diploids was better than triploids for these lakes during the years sampled.[/black]
[black][url "https://research.idfg.idaho.gov/Fisheries%20Research%20Reports/03-44%20Kozfkay%202002%20Hatchery%20Trout%20Eval.pdf"]https://research.idfg.idaho.gov/Fisheries%20Research%20Reports/03-44%20Kozfkay%202002%20Hatchery%20Trout%20Eval.pdf[/url][/black]
Anyway that is my 2 cents. Don't forget to post a link for the rest of us if you find interesting research on this subject.
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