Crab / Mud crab (Scylla serrata) culture technique Or Mud Crab Scylla serrata fattening in bamboo cage : Part 01

Crab / Mud crab (Scylla serrata) culture technique Or Mud Crab Scylla serrata fattening in bamboo cage : Part 01

Introduction :

Mud crab Scylla serrata (locally called “Jati or Haba Kakra”) is widely distributed in the Bangladesh and one of the most famous culture species, which has great economic value. We can culture it in earthen pond, pen and even in cages. Mud crab fattening in cage is required and to be useful for high growth and low mortality. Unfortunately, crab fattening in cage is not widely practiced in Bangladesh because of lack of proper knowledge and publicity. There are 640 sps of crabs available in various aquatic environments; out of these crabs of Scylla sps are larger in size, fetches high price nd suitable for culture practices. The Scylla species popularly are known as the Mangrove crabs, the Mud crabs, the Green crabs and the Brown crabs. Crabs can be cultured in earthen dug out ponds, tanks and cages. There are two types of culture methods 1.Culture 2.Fattening. In culture method crab lets either brought from hatcheries or wild are stocked in and grown for 6-9 months. In fattening method grown up, 50-100 gm sized crabs are brought from wild and fattened in ponds, for 3-4 months. Here I will discuss overall technique of crab culture-

Welcome to Telapia, Shrimp, Pangus, Koi, Crab /Mud crab (Scylla serrata), Seagrass Culture Tecgnique

Welcome to Telapia, Shrimp, Pangus, Koi, Mud crab (Scylla serrata) and Seagrass Culture Technique :

In Our country every Aquaculturist and farmers want to know about how to do culture Telapia, Shrimp, Pangus and Koi. Here I will discuss details culture technique regarding above species. Basically I will focus Telapia ( part 01-03), Shrimp ( part 01-04) and Pangus ( part01-03) fish culture technique.

Apart from this I will also discuss different disease and cure technique of above species.

Some important equation/ law of fish or shrimp farm operation

Aquaculture is the art of fish culture. To do this culture perfectly some scientific equation is important. like stocking density, survival rate, feeding rate  and actual feed demand etc..Some important equation of fish or shrimp farm operation are given below.

The pond area is calculated by the following way

Here pond depth = 6 feet

Cost benefit analysis of a fish pond / Financial analysis of an aquaculture farm

Cost benefits analysis of a fish pond / financial analysis of an aquaculture farm:

Cost Benefit analysis is very important to determine a farmer is economically benefited or not. Because during the culture period farmer needs to input huge feed, medicine and other materials. Sometimes major mortality is occurred which ultimately result in huge economic loose. 

Different Shrimp Disease and cure technique Part 02

PART: 02

In present situation in Bangladesh, most of the shrimp farmers face several shrimp disease problem. But accept WSSB or MBV, those disease are easily curable. Here I will discuss ( part: 02) different shrimp disease and how to cure those disease.

  

Protozoan or Luminance problem:

Symptom of (protozoan) luminance sp:

Ø  Shrimp could be count at night due to illumination.

Treatment:

Ø  Tok Doi 8-10 kg/Acre. ( 1^st day)

Ø  Super biotic 1kg/Acre. (2^nd or 3^rd day)

Ø  BKC (Benzalkonium chloride- (1.5 – 2 ppm)) 4L/ Acre. They are active against bacteria and some viruses, fungi, and protozoa and Bacterial spores.

Ø  Formalin 25-40 ppm. Depending on size and quantity of parasite.

Different Shrimp Disease and cure technique Part 01

Introduction

Diseases constitute one of the most important problems and challenges confronting shrimp farmers today. In present situation in Bangladesh, most of the shrimp farmers face several shrimp disease problem. White Sport Syndrome Virus (WSSV) is the one of the main disease for the shrimp farming in Bangladesh. But there is a wrong idea among the farmer regarding virus (WSSV) disease. Many farmers if their farm shrimp died they think this is due to virus. But virus is not only the one of the cause of shrimp died. Shrimp, like all animals, are subject to a variety of diseases. But accept WSSB, those disease are easily curable. Here I will discuss (Part 01-02) different shrimp disease and how to cure those disease.

                                                                   PART: 01

Gas problem or Bottom Purification: 

Up to one third of the content of feed used in culture system may be indigestible. And 25% of the feed become wasted. That’s why massive gas problem occur at the middle of the culture stage. If we do not solve it fish faced huge suffocation problem and mortality occur. We can easily understand by following diagram.

Feed waste in different way

Shrimp Culture/ Production Technique Part: 04

 Shrimp Culture/ Production Technique Part: 04

Stocking

Acclimatization:

 It is done by mixing culture pond water with Fry’s container water gradually with fixed time interval to adjust temperature, salinity, P^H and others environmental parameter. In PL drums, aquarium aeration and larval feed should also be provided. If anybody want they can also measurea actual survival rate in Hapa.

Shrimp Culture/ Production Technique Part: 03

 Shrimp Culture/ Production Technique Part: 03

Part 03

Water management

·         Screening (3 layers, 60 mesh size) out water before fulfilling pond.

·         Spray crustracide (Ripcot) on the dike and slope to remove and kill the crustacean from the pond surrounding area.

·         Settle water in pond 3 days after complete pumping to hatch the egg (fish and crustacean) into the pond with aeration.

·         Set up all aerator and necessary material like catwalk, feeding tray,  fencing net etc in the pond before bleaching.

Catwalk and feeding tray

Shrimp Culture / Production Technique Part : 02

                                                              Part: 02

Pond preparation:

Pond preparation is one of the most important factor for successful aquaculture operation.It is said that , most of the fish disease occur only for not preparing pond in right way.Water quality highly depends on soil quality that's why pond soil should be in good position.

 

Soil sampling:

Step of pond preparation

Soil samples are collected from the pond bottom and the dikes for pH and organic matter contents analysis. Soil pH analysis is generally conducted to find out lime requirement. Soil samples are collected in a S or X -shaped pattern and only the top soil 0-15 cm is taken as sample to determine soil quality.

Shrimp Culture / Production Technique Part : 01

Shrimp Culture / Production Technique Part : 01

Site selection for pond

·         Good water retention capacity of pond

·         Clay, clay-loam, silty-clay-loam are preferable kinds of soil for fish pond site.

·         Water quality of the site is an important factor because fish growth depends on it. Survival and growth of fish highly depends on ambient water temperature. A water temperature between 28 °C- 32 °C is generally good for fish farming.

·         Good transportation system