The growth of experimental carp after adding different concentrations of DMPT to the feed is shown in Table 8. According to Table 8, feeding carp with different concentrations of DMPT feed significantly increased their weight gain rate, specific growth rate, and survival rate compared to feeding control feed, while the feed coefficient significantly decreased. Among them, the daily weight gain of Y2, Y3, and Y4 groups added with DMPT increased by 52.94%, 78.43%, and 113.73% respectively compared to the control group. The weight gain rates of Y2, Y3, and Y4 increased by 60.44%, 73.85%, and 98.49% respectively compared to the control group, and the specific growth rates increased by 41.22%, 51.15%, and 60.31% respectively. The survival rates all increased from 90% to 95%, and the feed coefficients decreased.

Development of aquatic attractants

At present, there are many challenges in the production of aquatic feed, among which the three most important challenges are:

1. How to provide the feeding effect of feed products.

2. How to provide stability of the product in water.

3. How to reduce raw material and production costs.

Feed intake is the basis of animal growth and development, feed products have a good feeding effect, good palatability, not only can provide feed intake, promote animal digestion and absorption of nutrients, provide more nutrients required for growth and development, but also greatly shorten the feeding time, reduce feed fish material loss and feed consumption.Ensuring good stability of feed in water is a key measure to provide feed utilization, reduce feed loss and maintain pond water quality.

How to reduce feed and its production cost, we need to study and develop feed resources such as feeding attractants, replace animal protein with plant protein, improve the price process and a series of measures to experiment. In aquaculture, a lot of bait has not been taken by animals to sink to the bottom of the water is difficult to be fully ingested, not only cause great waste, but also pollute the water quality, so in the bait to add stimulate animal appetite substances - food attractant is quite important.

Inducing food can stimulate the smell, taste and vision of animals, promote the growth of animals, but also provide disease resistance and immunity, strengthen the physiologic hulling, reduce water pollution and other advantages.