In aquaculture ponds, if the same species of aquatic product is farmed for a long time, nutrient elements such as calcium and phosphorus are prone to deficiency, which in turn has an adverse effect on the quality of the aquatic product. Therefore, in order for the aquatic products to grow healthily and rapidly during the farming process, it is necessary to pay timely attention to the color of the pond water and the living conditions of the aquatic products, and to flexibly implement calcium supplementation measures according to the actual situation, so as to promote healthy growth of the aquatic products.

Reasons for calcium supplementation in freshwater aquaculture of aquatic products

The food of many species of aquatic products is the phytoplankton in the water, and calcium is one of the nutrient elements necessary for the growth of phytoplankton in water. Calcium is the main component of phytoplankton cell walls. If calcium is lacking, the growth rate of seaweed and other organisms in phytoplankton will slow down, leading to difficulty in fertilizing the water, some aquatic plants being prone to rotting, and the water color being prone to becoming turbid. For freshwater aquaculture, there are strict requirements for water quality, and appropriate hardness and pH are needed to protect the water quality. In addition to stabilizing the pH value of the pond bottom and the water, calcium can also ease the impact force of the water body, while reducing the toxicity of heavy metals in the water, promoting the rapid reproduction and growth of beneficial organisms in the water, and accelerating the regeneration of nutrients in the water. Regular application of calcium-rich nutritional products can solve the difficulty of fertilizing water and regulate and improve various dangerous water colors. Calcium is an important component of the bones, scales and other parts of aquatic products in freshwater aquaculture. If calcium is deficient, the farmed aquatic products will show slow shell hardening and death during molting.

Benefits of calcium supplementation in freshwater aquaculture of aquatic products

2.1 Comprehensive benefits of calcium

In the process of freshwater aquaculture, calcium supplementation is simply supplementing various nutrients for the product. Among various nutrients, the content of protein is the most important. It is an indispensable material component of tissues and organs, and also an important part of biologically active hormones and antibodies. Insufficient fat will lead to a decrease in protein utilization and absorption rates, and irregular metabolism of aquatic products. Vitamin C is a key factor in promoting healthy growth of aquatic products. If vitamins are lacking, the survival rate of aquatic products will decrease. Minerals are also indispensable for the growth of aquatic products. In the process of intensive freshwater aquaculture, minerals cannot meet the needs of aquatic products, so the amount of minerals needs to be supplemented through calcium, but the amount of minerals must not be excessive, as too much will cause poisoning of aquatic products. Immunity enhancers are indispensable nutrient elements for aquatic products in the process of freshwater aquaculture. Proper use of immunity enhancers can improve the survival rate of aquatic products and at the same time promote healthy growth of aquatic products.

2.2 Benefits of calcium gluconate

After supplementing calcium gluconate, it can promote the absorption of calcium by aquatic products, and drive aquatic products such as shrimp, crabs and mussels to molt and harden their shells, increasing the physique of the aquatic products. Calcium contains high-quality energy and can help aquatic products quickly recover their physical strength and physique and enhance their own resistance. Calcium gluconate can be consumed together with daily feed, and can also be used on rainy days and after typhoons, while reducing the probability of floating heads. Calcium gluconate is rich in carbon source complexing agents, can promote algae reproduction, and has a particularly obvious water-fertilizing effect. It can improve the anorexia of aquatic products caused by severe weather and after the use of insecticides.

The role of calcium in freshwater aquaculture

The organ development and limb regeneration of freshwater-farmed shrimp and crabs are all completed through molting and shell shedding. However, the speed and success rate of molting and shell shedding are determined by the calcium content in the bodies of the shrimp and crabs. Only when the calcium amount is sufficient can the shrimp and crabs increase in size after successful molting and shell shedding, while also improving the resistance of the shrimp and crabs, increasing the survival rate and the economic benefits of farming. Adding sufficient calcium to freshwater can increase the calcium content in the water, promote the reproduction of algae organisms, make the water fertile, and provide natural oxygen and resistance hormones for aquatic products.

4 Timely calcium supplementation

4.1 When to supplement calcium

Generally, observe the living state of the aquatic products. When shrimp and crabs fail to molt successfully or soft-shelled shrimp and crabs die, calcium should be supplemented in time. When the water becomes warmer, the temperature is unstable, and the temperature difference between day and night is large, the seedlings of shrimp and crabs are more likely to react. At this time, the calcium content in the bodies of the shrimp and crabs is insufficient, making them especially prone to death during shell shedding. For aquatic products such as shrimp, calcium can be supplemented when they eat less before molting. Super Vitality Calcium can be used, with 1 packet sprayed on 1 mu of water body. For dead seaweed and large changes in the water environment, immediately spray highly stimulating drugs to prevent reactions caused in the aquatic products. At this time, mainly spray 1 packet of Vitality Calcium per 2 mu, while adding 1 packet of compound vitamins per 1 mu.

4.2 How to supplement calcium

In freshwater ponds, when fertilizing water and supplementing calcium, 2.5 kg of monocalcium phosphate can be added per mu of water depth. Such a ratio can both supplement the nutrient elements needed by the water body and help water algae reproduce quickly. Supplementing calcium and fertilizing water before releasing seedlings can both fertilize the water and supplement calcium, creating good living conditions for aquatic products. When supplementing calcium during water regulation, the photosynthesis of aquatic floating organisms can be used to increase the oxygen capacity in the water, bringing fungi and water algae to a balanced state.