1. Types of shrimp attractants: Alkaloids include betaine (the most widely used), trimethylamine oxide, thiobetaine, amino acids, etc. Natural attractants include Chinese herbal medicines, garlic and animal raw materials (such as squid paste, squid paste and scallop powder). 2. Introduction of food attractants: Additives used to improve the palatability of feed and stimulate the appetite of feeding animals are mainly prepared from natural substances with certain volatility (such as concentrates extracted from roots, stems, leaves, flowers and fruits of plants) and synthetic perfume raw materials (such as aldehydes, ketones, alcohols, acids, ethers, esters and other compounds).

I. Types of Shrimp Attractants

1, alkaloid

(1) betaine: Glycine trimethyl lactone extracted from the by-product of beet processing is the most widely used aquatic attractant in aquatic feed at present. Studies have shown that betaine has a good attraction to the sense of smell and taste of Macrobrachium rosenbergii. The feeding time of Macrobrachium rosenbergii is generally 1- 1.5 hours, and it can basically feed 45 minutes after betaine is used.

(2) Trimethylamine Oxide (TMAO): It is widely distributed in the muscles of marine teleost fish, mollusks (squid) and marine oligochaetes, and has a special flavor. A large number of studies have shown that adding trimethylamine oxide to shrimp, fish and shellfish has obvious food attraction and growth promotion effects.

(3) Thiobetaine (DMPT): It can promote the growth and feeding of various marine freshwater fish and lobsters to varying degrees.

(4) Amino acids: In aquaculture, several amino acids or amino acids mixed with nucleotides, trimethylolactone, fluorescent substances and other salts can produce synergistic effects.

2. Natural attractants

(1) Chinese herbal medicine: Chinese herbal medicine and some of its extracts can promote the feeding of fish and shrimp. Such as ferulic acid, Paris polyphylla and other plant volatile oil extracts, prawns, small miscellaneous fish, Monopterus albus and prawns have strong food attraction.

(2) Garlic: Allicin contained in garlic has a strong pungent smell, which can promote the feeding activities of fish and shrimp.

(3) Animal raw materials: In actual production, squid paste, squid paste and scallop powder are often used as attractants for shrimp bait, which has good feeding effect. He Ming (198 1) used earthworm dung as a food attractant, which could increase the food intake and feeding times of prawns.

Second, what is an attractant?

1. Attractant refers to an additive used to improve the palatability of feed and stimulate the appetite of feeding animals. It is mainly prepared from natural substances with certain volatility (such as concentrates extracted from roots, stems, leaves, flowers and fruits of plants) and synthetic perfume raw materials (such as aldehydes, ketones, alcohols, acids, esters, ethers and other compounds).

2. Attractants are generally bright in color, strong in smell and good in palatability, and are a combination of color and fragrance. It can stimulate the sight, smell and taste of animals to gather around the feed, accelerate food intake and increase food intake.