growing bio film on habitat structures - 02/29/12 04:26 PM
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!!!!
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!!!!