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In addition I found an article that provides that BG , as common sense would tell you , eat a bunch of tilapia yoy/fry. So the tilapia will take pressure off the BG because they are an alternate source of food for LMB and they provide food for a lot of BG. Better fed BG are in better condition and produce more BG egg/fry. Further since 3-4in BG are the biggest predator in #s on small BG (yoy/fry) and they are eating yoy tilapia you may get higher survival rates for BG yoy. Thoughts or comments ?
Vulnerability of Redbelly Tilapia Fry to Bluegill
Predation with Changes in Cover Availability
WESLEY B. BICKERSTAFF • AND CHARLES D. ZIEBELL
Arizona Cooperative Fishery Research Unit 2
WILLIAM J. MATTER
The University of Arizona
ABSTRACT
The successful use of redbelly tilapia (Tilapia zilh') to control aquatic plants in ponds with game
fish depends on high survival of tilapia young. We tested the vulnerability of redbelly tilapia fry
under parental care to predation by bluegill. Experiments were conducted for a 3-day period in
5.5-m diameter pools at three levels of artificial plant cover (25, 50, and 75%) and at two densities
of predators (15 and 20 per pool). Predation rates on 14-day-old, unprotected fry also were deter-
mined. Fry survival was lowest with 25% cover (mean 40%) and highest with 75% cover (mean
72.5%). The survival of fry at 50% cover (mean 68.2%) was significantly higher than survival at
25% cover, bnt there was no significant difference in fry survival between 50 and 75% cover. Fry
survival was poor without parental care, ranging from 6 to 34%. Extrapolation of the survival data
indicated that too few Tilapia zilli, when stocked with predatory game fish, would survive to the
size where they could adequately control aquatic plants.
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