Rotenone is the piscicide most often used to kill fish. Rotenone is a naturally occurring compound derived from the roots of certain tropical and subtropical legume plants.
Which one of the following is harmful for fish culture?
The most common negative environmental impacts that have been associated with aquaculture include: waters eutrophication, water quality, alteration or destruction of natural habitats; introduction and transmission of aquatic animal diseases (FAO, 2006a).
Which one is mainly responsible for growth in fishes?
The growth in the fish farming sector mainly comes from the freshwater aquaculture sector, as marine finfish culture is hardly practiced on a large scale. About 12.8 percent of total animal protein consumed in India comes from freshwater fish.
Which is primary producer in fish pond?
So the correct option is ‘algae’
Which of the following are kinds of fisheries Mcq?
- Mori culture.
What is the main objective of manuring the fish pond?
The primary purpose of manuring ponds is to create conditions which facilitate an increase in the stocks of good quality natural foods, thereby increasing fish production. An increase in fish production is associated with density of stocking.
Is aquaculture good or bad?
Along with the positive aspects of aquaculture come some negative ones. Fish farms can impact wild fish populations by transferring disease and parasites to migrating fish. Aquaculture can also pollute water systems with excess nutrients and fecal matter due to the large numbers and concentrations of farmed fish.
What is fish culture called?
The breeding, rearing, and transplantation of fish by artificial means is called pisciculture, in other words, fish farming. It is the principal form of aquaculture, while other methods may fall under mariculture. It involves raising fish commercially in tanks or enclosures, usually for food.
Which is the best fish for farming?
Java, blue and nile tilapia are the best species for backyard fish farming. Catfish. Exceptional taste and hardy resistance to disease and parasites make catfish another good choice for beginning fish farmers. Catfish grow quickly — a large fingerling can reach 1 pound within five months.
Which fish grow faster in India?
1 Catla. Catla is the fastest growing Indian major carp species and widely distributed throughout India, Nepal, Pakistan, Burma and Bangladesh (Fig. 19). It inhabits the surface layer of water and feeds upon plankton.
Which is the sign of diseased fish?
Fish infected with Aeromonas or other closely related bacteria may show signs that include bloody spots or ulcers on the body, fluid accumulation in the abdomen (“dropsy” and “pinecone disease”), ragged fins, or enlarged eyes.
What is primary productivity in fish ponds?
Gross and Net primary Production Net primary production Net primary production is the total rate of photosynthetic CO₂ fixation minus the rate of loss of CO₂ in respiration. 10 According to the methodology used phytoplankton photosynthesis can be expressed either as gross or net.
Why are ponds freshwater?
Freshwater ponds and lakes are influenced by groundwater, precipitation, stream flow and evaporation. … Open freshwater ecosystems include both ponds and lakes. A pond or lake ecosystem consists of four distinct habitats: shore, surface film, open water, and bottom water.
Which type of soil is highly recommended for fish rearing Mcq?
The best soils for fish culture are the sandy clay, silty clay loam or clay loam soils which belong to the USC-CL group.
What is aim of fish culture?
Major objectives of an integrated fish culture are: … to develop a more economic ration for fish from wastes to useful fish protein production. to solve the waste management problem. to controle the pollution problem associated with livestock (in the form of fly and odour).
Which is anadromous fish?
Anadromous fish are the fish that born in freshwater, then migrate to the salt water where they grow into adults and again migrate to the freshwater for breeding e.g., Hilsa, salmon and trout.