Course Content
Introduction
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Introduction
Fisheries
Desirable characteristics of fish for culture
Attributes of common carp that makes it suitable for culture
Biology of cultivated indigenous and exotic fish species
Importance of fish
Water Quality
0/14
Temperature
Thermal stratification
Diel fluctuation
Temperature management in fishponds
Dissolved oxygen
Principle sources and sinks of oxygen in water
Measurement of dissolved oxygen
Dissolved oxygen requirements to fish
Solutions for maintaining dissolved oxygen in pond
Turbidity
Turbidity management in fish pond
pH
Effects of pH on fish
Different types of phytoplankton
Pond Management
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Site selection for pond construction
Advantages of liming in pond
Pond fertilization
Inorganic fertilizers
Fertilization level depends on secchi disk transparency value
Feed formulation
Wild and predatory fishes
Control or Eradication measures of predatory fishes
Aquatic Plants and their control
Classification of aquatic plants
Control of aquatic plants
Fish farming system
0/14
Classification of fish farming system
Extensive fish farming system
Semi-intensive fish farming system
Monoculture
Polyculture
Pond culture
Management of cage fish culture
Pen Culture
Construction of pen culture
Raceway culture
Rice-fish farming
Techniques of fish culture in rice fields  
Characteristics of fish suitable for Rice-Fish culture
Other types of cum fish farming
Fish breeding
0/15
Selection of brood stock
Sex identification
Source of brood stock
Feeding
Care and management
Induced spawning or hypophysation
Breeding season of cultivated fishes in Nepal
Fecundity
Dosage of inducing agents for various species of Chinese and Indigenous major carps
Latency period
Spawning
Breeding of common carp
Stages of fish transportation
Conditioning of fish
Methods of packaging and transportation of fish
Fish Disease and Parasites
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Signs of sickness of fish
Fungal diseases of fish
Bacterial disease
Protozoan disease
Disease caused by worms
Disease caused by crustaceans
Non-infectious diseases
Learn Principles of Aquaculture with Rahul

Characteristics of fish suitable for Rice-Fish culture

  • Must thrive in shallow water.
  • Must tolerate high water temperature.
  • Must tolerate low dissolved oxygen.
  • Must withstand fairly high turbidity.
  • Have to grow rapidly to marketable size.
  • Must not show escaping tendency as shown by wild fishes.
  • Eg: Common carp and Nile tilapia.

 

Suitable varieties of rice for Rice-Fish culture

  • Masuli: Late maturity ( 155 days)
  • Sabitri : Moderate maturity ( 140 days)
  • Radha-4 : Early maturity (125 days)
  • Janaki, Himali,Kanchan, Barse-1, Barse-2, etc.

 

Preparation of rice field and plantation

  • Rice seedlings are planted at a distance of 20-25 cm.
  • Depth of water should be about 15-25 cm.
  • Small fingerlings (<5 g) can be stocked soon after rice is transplanted while larger fingerlings ( >10 g) should not be stocked until rice has turned fully green ( 10-15 DAT).
  • About 6000 fingerlings per hectare of common carp or 9000 fingerlings per hectare of Nile tilapia or mixed stockings of common carp and Nile tilapia are recommended.
  • Fingerlings are released in trench by proper acclimatization.
  • Rice bran and mustard oil cake 1:1 @ 2-4% body weight of fish per day is provided.

 

Care and management

  • Snake control using snake trap.
  • Bird control using flash guns, sirens, bamboo rattles and bells.
  • Prevent water leakage.
  • Don’t use pesticides as far as possible.

 

Harvesting and Yield

  • Fish should be harvested before a week of rice harvest.
  • Water is drained gradually and fish are harvested from the trench.
  • Yield varies from 200-500 kg/ha/year.
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