View Full Version : breeding silver perch
06-29-2007, 2:41 AM
has any one on mfk ever bred silver perch in non comercial quantities?
06-29-2007, 2:52 AM
Google "breeding silver perch".
I have them at a pond near me 500m, so I always catch them, but no ideas on spawning because i've never seen small ones.
you'd need to keep them in something pretty big
06-29-2007, 4:40 AM
I would go for 180G absolute minimum. They grow to almost 12".
06-29-2007, 9:46 AM
yeh i know ive got a 60"x24"x28"H tank. the size the fish can get to does not concern me as they are slow growers and i will be moving soon so hello 10x3x2.5H foot tank!!. i did google breeding silver perch and there was not much on breeding. only fisheries which gives a brief description and not enough to go on.
06-29-2007, 5:22 PM
Are you sure you want to breed them in that 560G your getting? You may be able to do it in your 150.
07-02-2007, 3:11 PM
oh yeh im pretty sure i will breed them in th 160 but the 560 will be mainly for the tank so when the perches get BIG!!!
07-03-2007, 5:00 PM
Yeah true. But you dont wanna have to catch fry in a 560.
07-03-2007, 9:53 PM
i want them to breed in the 160. 560 is for when my two perch and other fish get huge.
07-04-2007, 7:08 PM
What are you going to have in your 560?
07-04-2007, 7:22 PM
Just curious why you want to breed silver perch? for the challenge?
Australian Google search:- Bidyanus bidyanus
I'd pick something easier to start with :nilly:
Silver perch broodstock are available from several growers in WA and should be held in earthen ponds for at least seven months prior to the breeding season (Rowland, 1984). A good typical pond for holding broodstock has a surface area of 0.1ha. About two-thirds of the pond is 1 m deep, the other third around 2.4 m deep. A concrete sump or raceway is built into the deepest section of the pond to facilitate the recapture of the fish when the pond is drained. Silver perch broodstock are stocked at densities up to 200/ha. Both sexes are placed together, usually with a few extra males to ensure fertilisation of eggs when recaptured for breeding (Thurstan & Rowland, 1995).
Rowland (1986) suggested the following fertiliser regime for larval-rearing ponds, applied ten days before stocking then every fourteen days afterwards until harvested:
Super phosphate 70kg/ha; sulphate of ammonia 60kg/ha; potash 10kg/ha; and one of the following types of organic fertiliser: poultry manure 225kg/ha initially, 70kg/ha weekly; or lucerne hay 285kg/ha initially, 110kg/ha weekly.
Fertiliser regimes are usually site specific as they depend on pond soil type, weather conditions, water type and fertiliser cost. Comprehensive studies on pond fertilisation practices are provided by Lannan et al. (1986) Boyd (1990) & Anderson (1993).
Silver perch broodstock are removed from ponds and are then induced to spawn in tanks. Broodstock will mature naturally but generally females must be induced to spawn by injection of a hormone, human chorionic gonadotrophin (hCG) at a dose rate of 200 International Units per kilogram of body weight (IU/kg). After hormonal injection, ripe fish placed in tanks spawn in around 36 to 40 hours and the eggs are fertilised naturally (MacKinnon, 1989).
In a spawning season, a large broodstock female weighing 1.8 kg can produce approximately 500,000 eggs. Fertilised eggs are collected from tanks using a 2 mm mesh and placed in cone-shaped fibreglass tanks with gentle aeration at a density of up to 500 eggs per litre. Eggs hatch in approximately 24 to 30 hours at 24 o C. Larval development takes 18 days. WA producers have had to adapt eastern states culture techniques to WA conditions and this has resulted in slight changes to methodology (G. Whisson, pers. comm.).
Although both silver perch eggs and juveniles are susceptible to saline conditions, at low salinities (<5 ppt) juvenile silver perch demonstrate a better survival rate over a 20-day period than those hatched in fresh water. The increased survival in low salinities may be due to the salt's inhibition of microbial pathogens (Rowland, 1984; Merrick & Schmida, 1984; Allen, 1989). This provides an opportunity for the farming of this species in farm dams in the wheat belt area of WA which are moderately salt-affected.
Larval-rearing ponds need to be filled 10 to 14 days before stocking, with water pre-filtered through a 0.5 mm screen to remove potential predators such as aquatic insects and other fish species. When full, ponds are fertilised with inorganic and organic fertilisers to produce phytoplankton followed by zooplankton blooms. Larvae completely resorb their yolk sac five to six days after hatching and are now stocked directly into ponds after hatching (Thurstan & Rowland, 1995).
Fertilisation of ponds promotes populations of micro-organisms (bacteria, protozoans) and blooms of microscopic algae, which are then grazed on by zooplankton (copepods, rotifers, cladocerans). Silver perch larvae feed first on freshwater rotifers (Brachionus spp.), followed by copepods, then cladocerans as the larvae increase in size. Rotifer numbers need to be around five per millilitre (ml) to support a stocking ratio of 50 to 100 larvae m 2 . During this period frequent monitoring of water quality (temperature, pH, dissolved oxygen and total ammonia nitrogen), zooplankton populations and examination of larvae for parasites are essential (Thurstan & Rowland, 1995c; Lambert, 1998).
Metamorphosis begins with the development of fin rays after about seven days and is completed at around day 10 to 14 or when larvae are 10 mm total length (TL). After five to six weeks the fish should have full scale development and be between 25 and 35 mm TL (0.5 grams). Once larvae have metamorphosed they need to be weaned onto artificial feed - this should begin in the third week after stocking (S. Rowland, pers. comm.).
07-09-2007, 8:49 PM
Or just try and breed them for a great challenge as above, or breed them ,eat, hunt etc.