If you want to maintain algal feed for this system, you'll need to alter its design to either be a recirculating system or have retention ponds to minimize waste of feed as water discharges from the nursery. Recirculating systems need a sump for water storage and collection, treatment for biological wastes, and treatment to remove solids. Semi-closed system with retention needs a storage area that feed can be introduced into, that you'd cycle through the animals and exchange with new seawater before waste products and sediment build up. Some examples can be found in the FAO bivalve hatchery manual (www.fao.org/3/y5720e/y5720e0b.htm#bm11.6.1). Check with local authorities for regulations on water discharges.
Hi Dr. Supan, thanks yet again for the very good instructional video. I'm concerned about electric bills and pump maintenance, does it need to run 24/7, or is there some kind of a "down-time window", for an hour or two, bearing in mind also oyster/clam requirement?
Pump maintenance should be minimal if the intake is screened. The Sea Grant oyster lab operates the same pump in the video 24/7 for several months with no maintenance required (there's a 1 inch wire mesh screening the intake pipe). Electricity costs should be considered, but balanced with biological demand. A pump this size operating under load will likely consume at least 600 kWh per week if running 24 hours a day. Economical stocking densities require constant flow or you'll risk the water becoming hypoxic. Any time the oysters/clams are out of the water to try to reduce electric costs is time they aren't feeding or growing well.
The benefits of using a land-based nursery like this in stead of a a field nursery (like fine mesh cages) are convenience (silos are easily accessible), increased water flow (and thus food delivery), security (if you put the silos in an easily monitored location), and this system can be used if you don't have rights to put cages in the nearby water column but are able to draw and discharge water. All of that does come at the expense of setting up the system and the electricity to run it. Fine mesh cages would be better in areas with unreliable or nonexistent electricity grids.
Enjoyed learning these processes!
Good man. Great Learn.
Recirculate filter recirculate. Save the land and fill the platter.
If you want to maintain algae feeding for this drum nursery what do you suggest as it is a flow through water system countinously.
If you want to maintain algal feed for this system, you'll need to alter its design to either be a recirculating system or have retention ponds to minimize waste of feed as water discharges from the nursery. Recirculating systems need a sump for water storage and collection, treatment for biological wastes, and treatment to remove solids. Semi-closed system with retention needs a storage area that feed can be introduced into, that you'd cycle through the animals and exchange with new seawater before waste products and sediment build up. Some examples can be found in the FAO bivalve hatchery manual (www.fao.org/3/y5720e/y5720e0b.htm#bm11.6.1). Check with local authorities for regulations on water discharges.
Hi Dr. Supan, thanks yet again for the very good instructional video. I'm concerned about electric bills and pump maintenance, does it need to run 24/7, or is there some kind of a "down-time window", for an hour or two, bearing in mind also oyster/clam requirement?
Pump maintenance should be minimal if the intake is screened. The Sea Grant oyster lab operates the same pump in the video 24/7 for several months with no maintenance required (there's a 1 inch wire mesh screening the intake pipe).
Electricity costs should be considered, but balanced with biological demand. A pump this size operating under load will likely consume at least 600 kWh per week if running 24 hours a day. Economical stocking densities require constant flow or you'll risk the water becoming hypoxic. Any time the oysters/clams are out of the water to try to reduce electric costs is time they aren't feeding or growing well.
I ran the new electrical line from the panel to the pump with Zach Lea a few years ago. Call me a licensed subcontractor.
wonder how many people got that . .
Why dont you just put them in the bay inside fine mesh cage?
The benefits of using a land-based nursery like this in stead of a a field nursery (like fine mesh cages) are convenience (silos are easily accessible), increased water flow (and thus food delivery), security (if you put the silos in an easily monitored location), and this system can be used if you don't have rights to put cages in the nearby water column but are able to draw and discharge water.
All of that does come at the expense of setting up the system and the electricity to run it. Fine mesh cages would be better in areas with unreliable or nonexistent electricity grids.
@@LouisianaSeaGrant Thanks for your explanations.
But may be ur profit is just go to your
Electricity bill