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lordosis in bluegill
Started by
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, Dec 21 2009 11:15 AM
10 replies to this topic
#1
Guest_centrarchid_*
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Posted 21 December 2009 - 11:15 AM
The photograph is of a juvenile bluegill afflicted with lordosis. The spine is bent multiple times in the dorso-ventral plane. Full extent of spine curvature is not evident in the overlying tissue. This shows what the brown trout of another thread likely looks like posterior to the dorsal fin if it were to be filleted.
abnormal_bg_2.jpg 175.46KB
8 downloads
abnormal_bg_2.jpg 175.46KB
8 downloads
#2
Guest_CATfishTONY_*
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Posted 21 December 2009 - 06:11 PM
What can i say but very odd!
is this rare?
is this rare?
Edited by CATfishTONY, 21 December 2009 - 06:11 PM.
#3
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Posted 21 December 2009 - 07:12 PM
Sometimes an entire brood can look like this. Another brood by the same parents can be completely normal. The key is the feed. Bad / old feed fed too very young fish or their mom increases the odds lordosis. Genetics can also be a factor, especially if parents are hybrids. This example resulted from bad feed.
#4
Guest_az9_*
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Posted 21 December 2009 - 10:19 PM
Sometimes an entire brood can look like this. Another brood by the same parents can be completely normal. The key is the feed. Bad / old feed fed too very young fish or their mom increases the odds lordosis. Genetics can also be a factor, especially if parents are hybrids. This example resulted from bad feed.
Is this the same thing Centrarchid? I used to get a very small number of yellow perch from my supplier like this and produced a couple of them myself last year.
I also pulled a couple of perch out of the cage this year with what appeared to be a genetic anomaly known as "stump body." Unfortunately I didn't take any pictures.
Here's a genetic problem I had with a few of my largemouth bass I orginally got fro a supplier. The bottom of the jaw was pointed like the tip of a triangle.
I no longer grow out largemouth bass but I'm thinking I should use a few yellow perch from a different stock this year. The problem is I could easily get some wild fish but the possibility of bringing in fish that test positive for VHS scares me.
Edited by az9, 21 December 2009 - 10:21 PM.
#5
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Posted 22 December 2009 - 08:44 AM
Clarification:
When I said the following:
"I'm thinking I should use a few yellow perch from a different stock this year," I meant I should use some of my present stock AND some wild stock not completely replace my present stock.
Other than a few genetic anomalies health and growth is excellent, however.
When I said the following:
"I'm thinking I should use a few yellow perch from a different stock this year," I meant I should use some of my present stock AND some wild stock not completely replace my present stock.
Other than a few genetic anomalies health and growth is excellent, however.
#6
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Posted 22 December 2009 - 10:29 AM
Az9,
The yellow perch are good examples of lordosis and scoliosis. I see such animals coming from ponds when the plankton was slow to develop or based on phytoplankton that might produce toxins or otherwise not produce vitamins needed by larvae. With white bass and sunshine bass, when the crooked back rate was high, so was the frequency of hoppers (non-inflated swim bladder).
The yellow perch are good examples of lordosis and scoliosis. I see such animals coming from ponds when the plankton was slow to develop or based on phytoplankton that might produce toxins or otherwise not produce vitamins needed by larvae. With white bass and sunshine bass, when the crooked back rate was high, so was the frequency of hoppers (non-inflated swim bladder).
#7
Guest_gerald_*
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Posted 22 December 2009 - 02:58 PM
I get more crooked spines with rainbow shiner fry if I dont get the eggs out of their spawning bowl (coarse gravel) soon enough. They usually spawn in the morning, and if I take eggs out then, most are OK. But if I dont take them out until evening, my guess is that insufficient oxygen under the gravel screws up early development.
#8
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Posted 22 December 2009 - 03:22 PM
Yes, similar to problem we have with sunfishes incubated in nest without tending by sire. Nest with accumulated organic matter tend to have greatly reduced survival through exodus and many prolarvae can be observed with malformed spines and mouth regions. If broods incubated without parental sire, then I like to use very clean nest and an airstone operating at full blast sitting on gravel in middle of nest.
#9
Guest_gerald_*
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Posted 23 December 2009 - 11:34 AM
My shiner spawning nest is right below the filter return spout, so food, poop and everything else gets blasted down into the gravel. I pour out the freshly spawned eggs into another container, then slosh & rinse a couple times to remove most of the food/dirt. Then I leave them in a shallow glass baking dish until they hatch.
#10
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Posted 23 December 2009 - 11:39 AM
My shiner spawning nest is right below the filter return spout, so food, poop and everything else gets blasted down into the gravel. I pour out the freshly spawned eggs into another container, then slosh & rinse a couple times to remove most of the food/dirt. Then I leave them in a shallow glass baking dish until they hatch.
So your shiner eggs are not adhesive?
#11
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Posted 23 December 2009 - 05:48 PM
Nope, they just tumble down through the gravel. Dunno if this is true of other Hydrophlox shiners; chrosomus is the only one whose eggs I've seen.
So your shiner eggs are not adhesive?
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