Monday, May 4, 2020

Breeding and cultura of gold fish

             Gold Fish(Carassius Auratus)

           Common gold fish, Carassius Auratus,belongs to the order: Cypriniformes and family Cyprinidae. It is an omnivorous fish and fees on a wide variety of live feed and accepts artificial feeds also. Colou of gold fish ranged from Red,Orange,Silver, Black, Brown, With and many more. More than 30 varieties of gold fish are available. The most common varieties are Oranda,Lion head,Fan tail,Telescope eye,Bubbles eye,Albonio,Pearl scal and several others.

Required water parameters such as pH 7.0 to 8.0, temp 25 to 30°C, dissolved oxygen 5 to 7 ppm, dissolved free carbon dioxide 0 to 4 ppm and total alkalinity 80 to 100 ppm. Electric serato (pump) raise dissolved oxygen level of water to 6-7 ppm which is necessary for breeding. Partial water exchange 25 to 30%) is vary much essential from breeding tank. Breeding carried out in"Gamlas", 40 to 60 1 capacity which is made up of clay or cement or in rectangular glass aquarium of 50 1 capacity. General fecundity of gold fish ranged from 500-700 depending upon the size. Sex ratio is 2:1(male: female) to ensure successful breeding. Eggs are generally regarded during night hours. Fertilized eggs are transparent and graysh in colour and unfertilized eggs are transparent white. Eggs are sticky in nature; substratum may be maintained with soft weeds,tiles,corrals etc.,for settlement of eggs.
Fertilizer eggs hatch in 4 to 7 days depending upon water temperature. No parental care is seen. Parents eat hatchings. As a result will be removed after breeding.

Sex Detection:
            In case of male gold fish white bumps or tubercles develop on the operculum and peatoral fin. Main ray of pectoral fin have thick edge in case of male but thinner edge in case of female. Fins become more pointed in Case of male but look rounded in female. Vent assumes a concave shape with a small opening in male and vent becomes convex of female.

Culture of common gold fish:
                The cultura of common gold fish is being taken up normally in cement takes of dimensions 10' x5' x2' or 12' x6' x2'. Preferable temperature for culture is 15.5 to 24°c. pH range 7.0 - 8.0 and prefer moderate hardness  of 50- 75 mg CaCO3 per litre and oxygen level of 5-7 ppm. Generally 300 fry (23 mm) of gold fish are stocked in each cement tank of dimension 10' x5' x2'.
The newly hatched young ones depend upon their yolk size as a food source fo a couple of days. when the fry become free swimming they are being fed  with Artemaia,Daphnia,Moina,Tubifex worm and other planktons. Young ones of 2-3 days old feed with eggs yolk and dried milk powder. After 10 days the young ones start feeding the Tubifex worms and maintained till their disposal.

Friday, April 3, 2020

Raising the fry of Egg layers

          When the eggs hatch, the larvae that emerge look nothing like the parent fish. Instead, the larvae have a large, yellow yolk sac and are barely able to swim. The larva feeds on the eggs sac untill all the yopy  is absorbed. Once the yolk sac is absorbed, the fry starts feeding on external food. The fry of small fish can be first fed with infusoria,,"green water," or egg yolk.
 Later these fry can be fed  larger food like white worms, Daphnia,Artemia nauplii, and ground flakes. These food are good as a first food for slightly larger fry such as those of cichlids. Once the fish grow larger, large foods like brine shrimp,larger Daphnia,flakes,insect  larvae, and chopped Tubifex worms are accepted. The fry  should be fed several times a day. Many species need periodic sorting by size, so that larger fish do not cannibalize smaller fish.