Carp Flashcards
eurythermal
live under ice and up to 34*C
name the 5 varieties of carp
Scale carp - completely scaled MIrror carp - few large deformed scales line carp - deformed scales on lat line and dorsal ridge leather carp - few if any scales koi - ornamental
which carp was the original?
which carp is the fastest growing?
- scale carp
- mirror carp
how big can they get in the first year?
from hatch to 1.5kg
pond reared up to what size in 2-3 years?
1.5kg
when do males mature? females?
males: 2 years.
females: 3 years
pond culture
what does carp feed consist of?
aquatic inverts, crustaceans, snails, insects, annelids, some plants.
-consume sediment and filter food and expel large amounts of sediment.
what type of water do they like to live in?
very turbid water.
Polyculture carp originated where? what were they grown in?
China
grown in manured ponds. creates many trophic niches.
Name the 4 carp of POLYCULTURE
Silver carp
Roho
Big head
Grass
what do silver carp eat? what size do they get to?
feed on phytoplankton, microzooplankton. up to 2kg in 2 years, up to 50kg total
what do Roho feed on? growth?
bottom feeders. decaying vegetation and grass carp feces. up to 3kg in 2 years
what do big head carp feed on? growth?
eat microzooplankton, 3kg in 2 years
what do grass carp feed on? growth?
eat macrophytes, used to clear waterways.
1/2 plants become feces and roho food. 2-2.5kg/2years
For common broodstock, what does asia and europe prefer for size?
A: small brood. 2-5kg range
E: large brood. 10-12kg range
where is common brood taken from?
ponds and held in brood ponds w a drainable water source. sexes separated at maturity
Describe how to sex carp.
must be mature;
males: thinner, pecs larger, first ray thickened, nuptial tubercles, median ridge in front.
females: fatter, smaller pecs, no ray thickening, no nuptial tubercles, vent area red to pink.
what is the difference between spawning times in tropics and temperate regions?
tropics have 2 spawns/year in spring and late summer.
temperate have spring and early summer spawns, triggered by elevated temp and flooded veg.
is female ovulation timing critical?
nope
what hormone would you use to induce carp?
Carp pits.
how are three ways to preserve carp pits taken from surplus brood?
Ethanol preservation, Acetone dried, Lyophilized (frozen, then freeze-dried)
which method of carp pit preservation lasts the longest?
lyophilized pits, 4+ years
how many injections of carp pits to female? male?
female, 2 injections. male, 1.
name the three spawning methods.
1: kakaban
2: Dubish ponds
3: hand stripping
