Marine shrimp farming

Marine shrimp farming is a global aquaculture industry focused on cultivating shrimp or prawns for human consumption. This business involves the controlled breeding and rearing of aquatic animals in managed environments. While traditional methods have existed for centuries, large-scale commercial operations emerged in the 1970s. This growth was driven by rising market demands in the United States, Japan, and Western Europe. Today, the industry is a massive economic force. In 2003, global production exceeded 1.6 million tonnes. This production reached a total value of nearly 9 billion U.S. dollars.

The biological process begins with the shrimp's life cycle. Mature shrimp breed in marine habitats and lay between 100,000 and 500,000 eggs. These eggs hatch after 24 hours into tiny organisms called nauplii. The nauplii feed on internal yolk reserves before metamorphosing into zoeae. These zoeae then feed on wild algae. After several days, they transform into mysis larvae, which look like tiny shrimp. The mysis larvae feed on algae and zooplankton. Finally, after about 12 days, they become postlarvae, or young shrimp with adult characteristics.

In modern farming, this cycle is managed through three distinct stages. First, hatcheries breed the shrimp to produce nauplii or postlarvae. There are different types of hatcheries used in the industry. Small-scale hatcheries are often family businesses using small tanks. Greenwater hatcheries are medium-sized and induce algal blooms to feed larvae. Large-scale industrial hatcheries, known as Galveston hatcheries, use tightly controlled environments and high densities.

Second, nurseries grow postlarvae into juveniles for about three weeks. This stage uses specialized tanks called raceways, which are long, shallow, and flow continuously. Third, the grow-out phase involves raising shrimp to marketable size. This final stage typically lasts between three and six months.

Shrimp farming has deep historical roots in Asia. In Indonesia, people used brackish water ponds as far back as the 15th century. Some farmers practiced polyculture, growing shrimp alongside species like milkfish. They even rotated shrimp with rice crops in paddies during the dry season. In the 1930s, Japanese farmers began spawning Kuruma shrimp, or Penaeus japonicus.

Commercial farming later expanded to Latin America in 1969 in Mexico. By the 1980s, Taiwan became a major producer, though its industry later collapsed due to disease and poor management.

Geography plays a vital role in where shrimp are produced today. Asia produces about 75% of the world's farmed shrimp. China and Thailand are the most significant producers in this region. Thailand holds the title of the largest exporting nation. The remaining 25% of production comes mostly from Latin America. Brazil, Ecuador, and Mexico are the leading producers in that area. Currently, marine shrimp farms operate in over fifty different countries.

Farming methods vary significantly based on technology and scale. Extensive farms use traditional, low-density methods in large coastal ponds. These ponds can be larger than 100 hectares and rely on natural tides for water exchange. In contrast, semi-intensive and intensive farms use advanced technology to increase yields. These farms use artificial feeds and active management of the ponds. Intensive practices allow for higher densities, which helps reduce the need to convert more land into farms. However, these industrial monocultures are very susceptible to diseases.

The industry has faced significant challenges regarding ecology and sustainability. In the past, extensive farming often required clearing large areas of mangroves.

This caused ecological problems and drew criticism from NGOs and consumer countries. Repeated disease outbreaks also caused regional wipe-outs of shrimp populations. In response, the industry began changing in the late 1990s. In 1999, a new program was initiated to promote sustainable practices. This program brought together government bodies, industry representatives, and environmental organizations to improve regulation.