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  1. #1
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    Mallards Stock lakes with their poop

    This is a scary ass study if you're concerned about Asian Carp in America..........WOW.

    https://www.audubon.org/news/mallard...ugh-their-poop

    Later,

    Geo

  2. #2
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    This is interesting.

    Quote Originally Posted by GeoFisher View Post
    This is a scary ass study if you're concerned about Asian Carp in America..........WOW.

    https://www.audubon.org/news/mallard...ugh-their-poop

    Later,

    Geo
    I wonder if other birds can also transport live viable fish eggs. When I was still in Grammar school we use to go back to the woods and play in the stream there. There were small sunfish in the deeper pools of water. I always wondered how they got there. It was a small stream that I could jump across in most places and it was not always filled with water. But the large pools were about 1 or 2 ft deep and about the size of a large bathtub. I used seines to catch crayfish and little sunfish and small minnows. The only pond was way downstream about a mile away and it was above the creek. It was a farm pond and the fenced-in area held hogs and the small pond. The road my parents live on is the high area and the stream is on the south side of the road. On the North Side of the road it drops off and there are a few lakes on that side of the road behind the houses there. There was one very small pond on the south side of the road that I would catch frogs and huge tadpoles. It was not but 2 or 3 ft deep. I remember when it got cold the ice would be about 3" thick and as a little kid, I could walk out on the ice. We chopped holes in the ice and used a net to dip out some big tadpoles. They had hind legs formed already. Now that I think about it that little pond could overflow into the stream that I was talking about earlier. Maybe that is where the fish came from. But how did the fish get into that little pond as there was not stream feeding it? It was just rainwater and runoff from around the edge of the pond.

    I guess the birds helped bring the fish eggs to the stream and pond. I wonder if other shorebirds eat fish eggs and the eggs survive? There is more research to do. What about the fish that herons eat whole. Could the eggs inside those fish survive and be excreted alive.

  3. #3
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    Quote Originally Posted by GeoFisher View Post
    This is a scary ass study if you're concerned about Asian Carp in America..........WOW.

    https://www.audubon.org/news/mallard...ugh-their-poop

    Later,

    Geo
    Asian carp will live in any water but can not multiply if it is not a current driven lake because their eggs have to stay afloat to hatch
    Likes GeoFisher liked this post

  4. #4
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    Question

    Quote Originally Posted by joey heller View Post
    Asian carp will live in any water but can not multiply if it is not a current driven lake because their eggs have to stay afloat to hatch
    How does a current in the lake make fish eggs float? The density of the eggs is what makes them sink or float. It's all about buoyancy.

    Not only that but most lakes have small wind-driven currents in them. And if what you say is true then lakes without rivers running through them to give them a current would be devoid of Asian Carp. If you remember right they imported these Asian carp and raised them in ponds down south. They escaped the farm ponds when there was a big flood and have been making their way up the Mississippi River System ever since. And Eggs that float up to the surface are exposed to more sunlight and UV Light at the surface than they would if they were to sink to the bottom, even in shallow waters.

    Where do you come up with this stuff? Do you have any sources?

  5. #5
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    Quote Originally Posted by Moveon View Post
    How does a current in the lake make fish eggs float? The density of the eggs is what makes them sink or float. It's all about buoyancy.

    Not only that but most lakes have small wind-driven currents in them. And if what you say is true then lakes without rivers running through them to give them a current would be devoid of Asian Carp. If you remember right they imported these Asian carp and raised them in ponds down south. They escaped the farm ponds when there was a big flood and have been making their way up the Mississippi River System ever since. And Eggs that float up to the surface are exposed to more sunlight and UV Light at the surface than they would if they were to sink to the bottom, even in shallow waters.

    Where do you come up with this stuff? Do you have any sources?

    https://www.asiancarp.us/News/fluegg.html

    "To combat the threat of invasive Asian carp in the Great Lakes, the University of Illinois, in collaboration with the U.S. Geological Survey, has developed a tributary assessment tool to help predict which Great Lakes tributaries might be vulnerable to Asian carp spawning and could support egg transport and development. The tool, Fluvial Drift Simulator (FluEgg), is a three-dimensional numerical model developed to evaluate how rivers carry and spread Asian carp eggs. The model incorporates information about Asian carp egg development and river flows to provide insights regarding the likelihood of a river to be suitable for spawning, the potential of a river to transport Asian carp eggs in suspension until hatching, and the identification of the location of Asian carp eggs at different developmental stages. This information is important because it is believed Asian carp eggs must stay off the river bottom in order to hatch."



    https://www.usgs.gov/news/asian-carp...iously-thought


    "Laboratory experiments in flowing water using synthetic surrogate Silver Carp eggs demonstrate egg suspension at lower velocities than previously thought, according to a new U.S. Geological Survey study. The drift of synthetic eggs at a range of flows was evaluated to provide insight into both suspension of water-hardened Silver Carp eggs and the potential interaction of eggs with the bottom of a river.

    Since Asian carp eggs must stay suspended in rivers to survive to hatching, it is important to understand what flows cause them to settle to the bottom. These critical flow conditions help scientists to determine which rivers may be suitable for Asian carp reproduction. Results are published in the journal PLOSONE."

    "Scientists with University of Illinois and the USGS recently studied the suspension, transport and settling of Silver Carp eggs using synthetic surrogates at the Ven Te Chow Hydrosystems Laboratory, University of Illinois at Urbana-Champaign. The researchers found that 65 percent of the eggs were in suspension at mean velocities as low as 0.07 meters per second, considerably lower than previously thought (0.15 to 0.9 meters per second). If eggs are staying in suspension at these small velocities, then survival rates would be higher than previously expected in low flow systems. In addition, dimensionless ratios between turbulence and egg sinking rate were calculated for different flow conditions. These ratios can be used for first order assessment of egg suspension together with observed egg suspension mode from laboratory experiments. Results provide more information on egg suspension (i.e., 50 percent of eggs in suspension) than a mean velocity threshold.
    Tatiana Garcia, USGS research hydrologist and lead author of the paper, performed experiments in moving water in a temperature-controlled re-circulatory flume with a sediment bed. Styrene beads were used as synthetic surrogate eggs to mimic the physical properties of water-hardened Silver Carp eggs. Egg suspension and drifting behavior of synthetic eggs was evaluated under different flow conditions and bed configurations."
    Likes joey heller liked this post

  6. #6
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    Quote Originally Posted by Moveon View Post
    How does a current in the lake make fish eggs float? The density of the eggs is what makes them sink or float. It's all about buoyancy.

    Not only that but most lakes have small wind-driven currents in them. And if what you say is true then lakes without rivers running through them to give them a current would be devoid of Asian Carp. If you remember right they imported these Asian carp and raised them in ponds down south. They escaped the farm ponds when there was a big flood and have been making their way up the Mississippi River System ever since. And Eggs that float up to the surface are exposed to more sunlight and UV Light at the surface than they would if they were to sink to the bottom, even in shallow waters.

    Where do you come up with this stuff? Do you have any sources?
    I don't think the eggs have to "stay afloat" (as in floating on the surface) ... but they do have to stay moving along with the current & not settle to the bottom. They originated from the large turbid river systems of China (mostly), so that's their natural spawning habitat/conditions. They don't seem to spawn in lakes, for lack of sufficient current, but do spawn in the rivers below the dams of those lakes ... and they can get into those lakes thru locks (if the dam has a lock system). The only way they can get into a body of water that does not have a lock system at its dam is to be captured & transported & released (which is illegal).

    But, there is a theory that they may be acclimating to "less than ideal conditions" for spawning. They've been here since the 60's - 70's ... so they may have had time to acclimate to these "less than ideal" conditions of our rivers & current flow.

    Also, there's not just "one" Asian Carp species .... there are four of them, each of which is somewhat different in their requirements & location, habits & habitat, and their detrimental impact.

  7. #7
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    Quote Originally Posted by Moveon View Post
    How does a current in the lake make fish eggs float? The density of the eggs is what makes them sink or float. It's all about buoyancy.

    Not only that but most lakes have small wind-driven currents in them. And if what you say is true then lakes without rivers running through them to give them a current would be devoid of Asian Carp. If you remember right they imported these Asian carp and raised them in ponds down south. They escaped the farm ponds when there was a big flood and have been making their way up the Mississippi River System ever since. And Eggs that float up to the surface are exposed to more sunlight and UV Light at the surface than they would if they were to sink to the bottom, even in shallow waters.

    Where do you come up with this stuff? Do you have any sources?
    It looks like he comes up with this stuff by researching it .

  8. #8
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    Their eggs are semi buoyant

    They are semi buoyant. They need to be suspended in the water. They don't actually float to the top though.

    https://journals.plos.org/plosone/ar...l.pone.0145775

  9. #9
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    Here is an interesting link about the timeline of Asain carp in the United States. I bet most people don't know how long they have been in the US or how they got into public water. This explains a lot of how they got spread...


    https://www.watershedcouncil.org/det...0in%20Missouri.

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