If feeding fish, that would not be the case as the weight of feed would be a new nutrient load. If you use Copper Sulfate to kill algae, there is no new nutrient load from the decay and regrowth. There is however, an increased BOD during the decay process.
I was wondering along the same lines. If I stocked 10 lbs of Tilapia, and they all died within 15 minutes of stocking, before eating any algae, then I would've added 10 lbs of additional organic nutrients into the pond. If they survive and eat algae all summer before perishing in the fall, would I not still have that 10 lbs of nutrients initial weight of the fish before they consumed any algae , to add into the equation?
I can see where their offspring would begin to convert algae into body mass, but since I do not know the conversion ratio I don't know where to go with that. But the original stockers, would enter the picture with mass gained somewhere other than my pond, and when they die they will deposit that mass into my pond? Course, that's splitting hairs pretty darn fine. Joined: Apr Northwest Ohio - Malinta OH. Bill Cody.
I think both sides are correct about the nutrient budget when using tilapia unless someone can explain it another way. Tilapia are basically eating existing plants algae-detritus produced from the earlier nutrient concentration or recycling nutrient budget of the system.
Granted nutrients can come from recycled nutrients, human inputs stocked tilapia , and new nutrients from watershed inputs. If one considers nutrients of the stocked biomass of tilapia then the same applies to any fish stocked - human nutrient inputs. However the apparent nutrient surge is primarily from the rapid decay of a large fish biomass.
If one sees evidence of increased fertility after the tilapia decompose it is not really so much the new external source nutrients but just a surge of nutrients from the decay of freshly decaying fish flesh that was produced from gradual production and consumption.
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This will be my 3rd year of stocking tilapia and I feel like they are at least a "2-fer" and in some cases a "3-fer". They help control algae, they are a high producing forage fish to fatten up the bass and take some pressure off the bluegill, and you can eat them.
I also heard the stories of mass die-off problems, but it has not happened to me. I stock between lbs of tilapia in a 4 acre pond and have had zero problems. I always ask for extra albino tilapia because you can watch them easier throughout the summer and fall. Originally Posted By: gklop Hello all, This is my first post here although I have been able to get a lot of good information browsing the forums. Thanks, Gklop Gklop, One of the things we try to do on this site is provide good solid empirical and scientific findings and knowledge.
There really doesn't seem to be a lot of main-stream research, but tilapia are used in many projects that get little exposure. These include everything from aquaponics to municipal sludge cleanup. The empirical evidence is pretty strong in their favor. In at least the last years, we've seen very few downsides to the use of tilapia -- actually, I can't think of any. I was one of several who fought hard to get tilapia legalized for pond use in West Virginia.
There was fear they would get out of our ponds and become invasive species in public waters. The only exceptions are very close to the expelled cooling water from a couple of very large power plants that use large water reservoirs for cooling. Yet, they are "trained" to be allowed to sell chemicals that can do far more harm than good. Yes, there are good and safe chemicals. Many can be purchased without an applicator's license.
But, there is a mindset where the recommended amount is perfect, a little more is better, and way too much is even better. Under the right circumstances, they work.
Tilapia don't fit that profile. They can live in horrible water conditions while cleaning them up. They die when the water gets cool. As they die, they add nutrients -- which your pond may not need at that time.
But, if you choose at least a three year program of using them, those issues pretty much go away. The use of sterile triploid grass carp can also provide great benefit, as long as you don't add too many. Other fish species like bullhead catfish, koi, and common carp are not recommended because they are prone to overpopulation and muddying pond water in search of food.
Koi are also very prone to being eaten by predators because they can be easily spotted in a small pond. For more information on fish to stock in Pennsylvania ponds, see Fish for Pennsylvania Ponds and for more details on stocking rates, sizes and harvesting see Management of Fish Ponds in Pennsylvania.
Another fish that can be legally used for aquatic plant control in some cases is the grass carp or "white amur". These fish, originally from Asia, have been imported to the United States since the s primarily for control of aquatic plants.
In , Pennsylvania made it legal to import grass carp if they are the triploid variety. This means they have been bred to have an extra set of chromosomes and are therefore sterile.
Triploid grass carp are not able to reproduce and spread out of control. Grass carp rely almost entirely on aquatic plants for their diet. According to the PA Fish and Boat Commission, they prefer to eat submerged aquatic plants like pondweeds, elodea, coontail, naiad, and milfoil and even small floating plants like duckweed.
While they will eat some algae, especially when they are young, they are not usually able to control filamentous algae. Menu Audiences Clemson. Academics Research Extension About Giving. Stocking and Harvesting Fish in Stormwater Ponds Many fish species grow well in stormwater ponds, and there are many advantages to stocking fish in these ponds.
Bream Lepomis spp. Bream provide effective control of aquatic insects, and they serve as prey for largemouth bass. Bream should be stocked at a rate of fish per acre. Both bluegill Lepomis macrochirus and shellcracker bream Lepomis microlophus are suitable. If both are to be stocked together, they should be stocked at a ratio of 3 bluegill to 1 shellcracker. Bream are best stocked in fall or winter. Other bream species such as green sunfish, pumpkinseed sunfish, and hybrid bream should be avoided.
Largemouth Bass Micropterus salmoides are the most sought after freshwater game fish in North America. They feed both on invertebrates and smaller fishes, amphibians and reptiles. In ponds, bream serve as the primary forage for largemouth bass.
Given that the pond has an adequate bream population, largemouth should be stocked at a rate of 50 fish per acre in the early spring. For example, ponds less than 1-acre have little open water for threadfin shad to "school" and have safety in numbers.
Juvenile tilapia are especially easy bass food when they become sluggish in the fall; usually when the water temperature drops to 60 degrees. And large bass will gorge on the larger tilapia as they become lethargic. This allows bass of all sizes to enter the winter in excellent condition.
Tilapia also feed on detritus and are especially effective at reducing organic waste that causes odors in small, highly fertile ponds. Historically, tilapia have been stocked in ponds for aquatic vegetation control. Once the water temperatures drops into the 60's for good in the fall, the tilapia have done their job and you can begin removing them for the dinner table. By this time, it is not uncommon for the original stock tilapia to be in excess of 4 pounds!
The body cavity of tilapia is placed well forward, yielding a large triangular fillet of firm white flesh that is excellent in flavor. If they are regularly fed, they can often be caught on hook and line with anything that resembles feed. Golden raisins, bread balls, or even artificial flies in the shape of a pellet can all entice a hungry tilapia.
Tilapia become extremely sluggish before they die in the winter, and can be netted as they swim slowly in the shallows.
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