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Joined: Jun 2010
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Joined: Jun 2010
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Brief Review of Periphyton; Ecology, Exploitation, and Management Edited by M.E. Azim, et. Al. CAB Publishing, 2005
· Typically, algae are not the dominant component of periphyton in fish ponds. · Algae, (in periphyton) has a higher food value for fish food than vascular plants. · Dead periphyton is better fish food than dead phytoplankton. · Periphyton is better fish food than phytoplankton. · Bio Films (A.K.A. periphyton) have a “remarkable efficiency” for up taking nutrients. · D.O. is higher when substrates are synthetic rather than organic.(6.4mg/L and near zero for sugar cane) · Periphyton moves nutrients up the food chain better than fish food.
"Keshavanath et al. (2001b) reported an experiment with different types of substrates for enhancing the production of mahseer (Tor khudree, Cyprinidae). Bamboo poles, PVC pipes and sugarcane bagasse substrates were placed in 25 m2 concrete tanks with mud bottoms and fingerlings of about 3 g were stocked at densities of 1, 1.5, and 2 fish per m2. After 90 days, the highest net production with bamboo substrate was 447 kg ha-1 at the highest fish density, against 399 kg ha-1 with the PVC pipes." Only about 10% less on PVC than bamboo
“Development of a periphyton layer on a clean surface generally starts with the deposition by electrostatic forces of a coating of dissolved organic substances (mainly mucopolysaccharides), to which bacteria are attracted by hydrophobic reactions (Hoagland et al., 1982; Cowling et al., 2000). The presence of freefloating organic micro-particles in eutrophic waters stimulates this process. Bacteria actively attach using mucilaginous strands. This can take a week, but in some studies this was observed within days and even within a matter of hours. (Hoagland et al., 1982)."
Here's the proof that PVC is used all over the world in Aquaculture to grow bigger fish!!!!
Last edited by Peepaw; 02/29/12 11:28 AM.
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Joined: Jan 2009
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Moderator Ambassador Field Correspondent Lunker
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Moderator Ambassador Field Correspondent Lunker
Joined: Jan 2009
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All that I read in that quote is that in the production of mahseer, bamboo substrate produced 10% more net production than PVC.
By reading your quoted reference, it could be said that bamboo is better than PVC for fish production, and is also used all over the world for fish production.
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Joined: Jun 2010
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There is no shortage of data regarding the benefits of substrates to boost fish production. Bamboo is great, cheap and available to some areas. The obvious disadvantage is having to replace often and the decomposition of materials using up DO.
All depends on what you want to see.
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Joined: Jun 2010
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FHM substrates PVC substrates Why aren't they using bamboo?
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Joined: Aug 2002
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Hall of Fame Lunker
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Hall of Fame Lunker
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I've got all kinds of biofilm growing on surfaces in my recirculating systems. However peak production of nitrifying autothropic bacteria takes place if it doesn't have to compete with surface area with algae, heterotrophic bacteria, and solids. Peepaw, You do realize there are a lot of natural materials in a pond that have more surface area than man made structures? Aquatic vegetation comes to mind. I've thought about putting in a floating RBC in my trout pond just below the inflow to increase production like the ones I use in my RAS' below. I could also use it to produce electricity at the same time if I knew how! The incoming water would rotate it by dropping on the center baffles. The center baffles are simply quartered pieces of PVC. Here they are being siliconed in before the placement of another plastic circle, and then the fiberglass or PVC circles are added.
Last edited by Cecil Baird1; 02/29/12 10:37 PM.
If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.
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Joined: Jun 2010
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Holy cow, what a cool piece of equipment. Where does the fiberglass circles come from?
We have been working a great deal with reservoirs in the southwest, where they lack the aquatic vegetation. Lake Havasu has been a model of success, utilizing mass amounts of artificial habitat products to grow periphyton.
Being a fisherman and not a biologist, I still feel a mixture of many different materials, both natural and artificial gives fish variety to choose from. Our studies have shown bass for example, will use the wood early in the spring as water warms and the wood retains the heat. As the summer heat shines,then navigate to PVC which stays cooler than the wood.
Thanks for your insight.
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Hall of Fame Lunker
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Holy cow, what a cool piece of equipment. Where does the fiberglass circles come from? It's just fiberglass or PVC roofing material bought at a building supply store and cut into 2 foot diameter circles. There are 50 of them and then 50 more polystyrene circles I bought from a local plastic company. Total surface area is 600 square feet. We have been working a great deal with reservoirs in the southwest, where they lack the aquatic vegetation. Lake Havasu has been a model of success, utilizing mass amounts of artificial habitat products to grow periphyton.
Being a fisherman and not a biologist, I still feel a mixture of many different materials, both natural and artificial gives fish variety to choose from. Our studies have shown bass for example, will use the wood early in the spring as water warms and the wood retains the heat. As the summer heat shines,then navigate to PVC which stays cooler than the wood.
Thanks for your insight. Well where natural things are missing I'm sure artificial substrate can make a difference. The above RBC is capable of supporting 200 lbs. of fish. I'm not sure but it would seem it would be able to add 200 more lbs. of carrying capacity to my trout pond as far as additional nitrification if there are no problems with algae and suspended solids?
Last edited by Cecil Baird1; 02/29/12 10:46 PM.
If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.
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