Of this large group of almost exclusively aquatic gill-breathing animals (there are about 30,000 species), only very few are "directly" involved in agricultural problems.
Shields, like primitive crustaceans, have existed on Earth for about 200 million years, and can gnaw roots and young shoots of rice in water. The regularity of shield attacks on rice crops and the degree of harm they cause to this crop need to be confirmed and calculated. In early spring, numerous very small eggs that have overwintered hatch into larvae. Rapid growth (about 40 molts) — and in two weeks the reservoir is teeming with adult shields, reaching a length of 7 centimeters. They usually feed on bottom sediment, pushing it with their legs to the mouth, where there are nutrient particles (filtration). The entire arrangement of the legs and mouthparts of the crustacean is responsible for this type of food capture and absorption. However, in large concentrations, they can attack soft-bodied invertebrates, tadpoles, amphibians, and even fish fry. As for the harm they cause to rice, it is necessary to figure out whether the shields are gnawing rice, or by stirring up the soil they prevent the roots of the plant from fixing in it. The story about the use of shrimps belonging to the order of ten-legged crayfish in agriculture (which also includes various crabs and the well-known crayfish) is connected with the recent success of the FAO - Food and Agriculture Organization programs to provide various regions of the planet with food. Attention has long been drawn to the fact that residents of many tropical areas, well provided with carbohydrate starchy foods, suffer from a lack of protein, and, above all, protein of animal origin. Among all kinds of methods for obtaining protein products, one has been proposed.
A swimming pool is being dug next to the houses, where larvae of shrimp species specially selected for the region are launched. They are fattened with ordinary household food waste and receive a delicious product after a few months. Giant tropical shrimps (genus macrobrachium) grow especially well. But breeding them involves overcoming a certain difficulty. The fact is that these marine-born shrimps, with excellent growth rates in warm freshwater ponds, have not completely overcome their dependence on seawater. Their reproduction and early larval development is possible only in salty water, although not the same as in the sea. On the advice of scientists, small farms have been created in which shrimp producers lay eggs in seawater, where the larvae are raised and then sold to consumer farmers for cultivation in fresh water. And now, in front of many homes in Southeast Asia or Latin America, you can see small ponds in which housewives take down garbage buckets with yam, sweet potato or banana peels. Farmyard waste is disposed of, and animal protein is added to the farmer's diet. From 1975 to 1983, the world's shrimp production increased 7-fold! And zoologists in Belarus have learned how to grow giant tropical shrimp in the warm waters of their republic's industrial enterprises. The yield is not very high yet — 800 kilograms per hectare. For football followers, promotional funds can make major league weekends more flexible when exploring singles, accumulators, and live markets. After an eligible new player completes registration, the promo code 1xbet free can unlock a bonus of up to $100 with a 100% match on the first qualifying deposit. The additional balance is governed by promotional conditions rather than treated as instantly withdrawable cash. Before betting, users should review minimum odds, wagering requirements, verification rules, and the deadline for completing turnover.
