Preparation of catfish enlargement ponds.
One of the things that need to be considered in the effort to enlarge the catfish in the soil pond is the preparation of the fish enlargement pond.
Preparation activities for catfish enlargement ponds include drying activities, pond bottom processing, removal of black sludge, repair of embankments and waterways, liming, fertilizing, and filling of pond water.
The drying activity of catfish enlargement ponds is carried out with the aim of eradicating the fish pests and diseases in the pond, to eliminate toxic compounds or gases, and to rest the land. Drying at the bottom of the pond is carried out for approximately 3-7 days, depending on conditions and weather and soil conditions.
2. Processing the bottom of the pond
The basic processing activity of the catfish enlargement pond aims to loosen the soil in the pond, allowing the airing process to take place perfectly in the soil, speeding up the process of decomposing organic compounds in the soil, and removing toxic gases in the soil to escape into the air.
1. Lifting black mud
The bottom of a pond that is muddy black, foul-smelling, and black in color, should be removed and removed because such soil is already very acidic. The base layer of the black catfish enlargement pond is hoeed as deep as 5-10 cm, then lifted and moved to the embankment or other place outside the pond.
2. Repair of dike and drainage
Repair of the embankment in the soil pond needs to be done if there is a damaged one and prevents the leaking of the embankment. Leaky repair of the embankment is done by clogging the part that has leaked with the soil or with palm fiber. Meanwhile, channel improvement is carried out so that water intake is smooth. This repair is usually carried out during drying of the pond or in conjunction with removal of sludge.
Liming activities aim to kill pests, parasites, and fish diseases and to stabilize pond pH. The type of lime used for liming is agricultural lime (CaCO3) or dolomite in the form of CaMg (CO3) 2. lime technique is done by lime spread evenly on the surface of the bottom soil of the pond. After liming is complete, the bottom of the pond is reversed using a hoe. Dosage The amount of lime given ranges from 60-200 grams / m2, depending on soil pH conditions. The lower the soil pH (acid), the more lime needs
Fertilization activities in the enlargement pond are useful to provide a medium for growing natural food and nutrients for plankton (zooplankton) which are feed for catfish. Fertilizers that are often used consist of dried dirt from large livestock (cattle, sheep or buffalo) with a dose of 150 g / m2, urea fertilizer 15 g / m2, and TSP 10 g / m2. The dosage is adjusted to the level of pond fertility.
2. Filling fish pond water.
The filling of fish pond water is carried out with the water depth reaching 40-50 cm from the bottom of the pond. When spreading fish seeds, the fish pond water is maintained at its original height because the size of the seeds is still small. The height of the water in the soil pond is increased along with the increase in size and weight of catfish that are kept up to a height of 100-150 cm, depending on the construction and height of the pond.
After the preparation stage the soil ponds are carried out, then the seeds are stocked. The stocking density of catfish is the amount of fish that is propagated per unit area or per unit volume. The higher the seed stocking density, the more intensive the maintenance. Solid catfish seed stocking in the soil pond is adjusted to the size of the pond used for catfish farming.
for catfish seeds with a size of 3-5 cm the density of the seed is 500 - 1,000 / m2.
Catfish seeds with a size of 5-8 cm can be spread with a density of 200 - 500 / m2.
Catfish seeds size 8-12 cm can be propagated with seed density of 100 - 200 / m2.