Biology of Marine Catfish.pptx

This document discusses polyculture of carp fish in Bangladesh. It describes that polyculture involves culturing multiple fish species together that have different feeding habits and ecological niches. Common carp species cultured together in Bangladesh include various types of indigenous carp like rohu, mrigal carp, and exotic carp like silver carp. Effective polyculture management requires selecting compatible species, maintaining suitable water quality parameters, providing adequate natural and supplemental food, monitoring fish health and growth, and preventing diseases. Polyculture aims to maximize fish production from a water body by fully utilizing available resources.

This document provides information on magur culture, including pond construction, grow-out culture, feed management, health management, and harvesting. Ponds for magur culture should be small and shallow with suitable slopes and depth. High stocking densities of 50,000-70,000 fish per hectare are recommended. Feeds should provide 30-32% protein and be fed twice daily at 3-5% of body weight. Bacterial pathogens are a key health issue requiring treatments like CIFAX. Harvesting occurs after 10-12 months when fish reach 100-150g, yielding 2-3 tonnes per hectare.

Cage culture involves raising fish in mesh boxes placed in bodies of water. It originated in Cambodia about 200 years ago when cages were used to transport live fish to market. Cages are constructed with frames made of wood, plastic or steel, with floats to keep them buoyant and weights to anchor them. They come in various shapes and sizes, usually square or rectangular, and are 20-60 cubic meters. Cages are either fixed in flowing water, floating in lakes/rivers/offshore, or submerged and movable in areas prone to cyclones. Fish are fed through natural water movement and supplemental feeding of rice bran, fish meal and soybean cake. Fish production ranges from 3,000-25,000 kg

This document discusses seed production of the Asian catfish (Clarias batrachus). It describes the catfish's importance as a food fish and its distribution in India, Bangladesh, and Thailand. The document outlines the process for broodstock development, including tank setup, feeding, and selection of brood fish based on size and secondary sexual characteristics. It provides details on the hormone injection process for induced spawning and the subsequent stripping of eggs and fertilization. Larval rearing is also summarized, from initial feeding of hatchlings to growing fingerlings in outdoor tanks.

This document provides information on monoculture fish farming techniques used in India. It discusses how monoculture farming involves raising only one type of fish species in a pond. It notes that monoculture allows for easy monitoring of fish performance but can lead to issues like water quality degradation. The document also outlines the steps involved in monoculture fish farming, including construction of ponds, breeding fish, and transferring fry and fingerlings between ponds. It provides details on suitable fish species used in Indian monoculture like various carp species.

Fish Taxonomy & Charateristics Kingdom Animalia Phylum Chordata Subphylum Vertebrata (Back bone present) Supraclass Agnatha (Jawless Fish) Class Myxini (Hagfish) Class Cphalospidomorphi (Lamprey) Supraclass Gnathostomata (Jawed Fish) Class Chondrichthyes (Cartilaginous Fish) Class Osteichthyes (Bony Fish)

Aquaculture has been practiced for over 2500 years and originated in China, Egypt, India or other countries. It is defined as the production of fish through farming or rearing in confined waters. Major classifications of aquaculture include based on habitat, water flow, culture organism, culture method, culture system, and purpose. Trends in India include freshwater aquaculture of crustaceans, fish, and ornamental fish as well as saltwater aquaculture of shrimp and crabs. Global fish consumption has nearly doubled in the last 45 years from 9.01 kg/capita in 1961 to 17.1 kg/capita in 2007, driven by population growth and preferences for fish as an affordable source of protein

The document discusses the construction and maintenance of a fish farm. It describes selecting a suitable location based on topography, soil type, and water supply. The ideal layout includes hatchery pits, nursery ponds, rearing ponds, and stocking ponds of different sizes. Pond maintenance involves liming to control parasites, fertilizing to increase natural food sources, and harvesting fish when they reach maturity. Proper site selection and regular pond upkeep are essential for a productive and sustainable fish farming operation.

Fins are important appendages that help fish maintain position, move, steer and stop in water. They are composed of bony spines covered in skin and aid with mobility, stability and maneuverability. The main types of fins are paired (pectoral and pelvic) and unpaired (dorsal, caudal, anal). Each fin type has a distinct function in swimming, turning and balancing. Fins have evolved diverse shapes and forms to help fish survive in their environments.

This document discusses the feeding habits of fish. It begins by defining feeding habit as the kind of food an animal habitually consumes during its life or at a particular stage. It then describes different modes of feeding such as herbivores, omnivores, carnivores, and limnivores. The document highlights that understanding the feeding habits of fish is important for polyculture systems. It also discusses the major types of feeding like grazing, predation, straining, sucking, and parasitism. Finally, it provides examples of different mouth structures in fish and how they relate to the fish's diet.

Parasitism: It is defined as an intimate and obligatory relationships between two heterospecific organisms during which the parasite, usually the smaller of the two partners is metabolically depended on the host. Parasitology: The term ‘parasitology’ is originated from Greek word- ‘Para’ means beside, ‘sitos’ means food and ‘logus’ means study. It is the branch of science which deals with the study of the relationship between the parasite and host. This discipline includes several approaches to the study of parasitic organisms such as phylogeny, morphology, ecology, life history, physiology, chaemotherapy, serology, immunology and bio chemistry. Fish parasitology: It is the branch of science that deals with the study of parasite of fishes. It includes the infection and disease of fish caused by parasite.

Tilapia is a common name for cichlid fish from Africa and the Middle East that are farmed globally. They are the third most important aquaculture species after carp and salmon. This document discusses tilapia taxonomy, history of use in aquaculture, farming methods, environmental requirements, breeding processes, and sex reversal techniques. It provides detailed information on farming practices and protocols for tilapia production.