Tag Shrimp

Based on the results of a study in Peru, the authors found that the high volumes of quick lime and hydrated lime needed to effectively control vibriosis outbreaks in shrimp ponds would raise pH levels in culture water and stress the animals under culture. 

In trials raising larger juvenile shrimp than those used previously in indoor super-intensive recirculating raceway systems, the positive effects from increased stocking size, growth rate and survival resulted in a reduced crop duration time. 

Extrusion manufacturing of aquafeeds has recently seen advances in several areas. The development of new die technology has multiplied hourly output. 

In studies of early mortality syndrome/acute hepatopancreatic necrosis syndrome at an Agrobest shrimp farm in peninsular Malaysia, results indicated that the disease originated with infected postlarvae and quickly spread throughout the farm. 

The authors tested the effects of sequencing autotrophic and heterotrophic dominance on water quality levels in a recirculating system raising shrimp. Culture tanks were inoculated with nitrifying bacteria, and chemoautotrophic dominance was maintained. 

Protein hydrolysates can be produced by acid, base or enzymatic hydrolysis processes. Acid hydrolysis produces salt that makes the product unsuitable for food and destroys some essential amino acids. An optimum process for one fish or shellfish by-product may not be optimum for another. 

To meet demand and maintain the sustainability of the shrimp aquaculture industry, commercial synthetic artemia has been developed for use as a bio-secure replacement for live artemia in larviculture. 

Research continues in the global efforts to identify the cause of acute hepatopancreatic necrosis syndrome in farmed shrimp and find solutions to stop the major losses caused by its spread. 

Controlled by timers, automatic feeders should be placed in deeper areas of ponds and away from aerators. Overfeeding is rare during automatic feeding, and pond bottom quality is maintained through grow-out cycles. 

Since Taura syndrome virus was in the Americas when yellow head virus become pandemic in Asia, it is possible TSV prevented shrimp in the Western Hemisphere from infection by materials from Asia containing YHV. To test this idea, the authors evaluated the viral interactions in shrimp preinfected with TSV and then challenged with YHV. 

Authors evaluated how limiting dietary essential amino acids and long-chain polyunsaturated fatty acids would affect the growth performance of white shrimp raised in a zero-water-exchange biofloc system. The shrimp were fed diets with varied levels of fishmeal and fish oil and supplemented with soy products. 

Bangladesh shrimp farmers are adopting measures to improve quality to comply with international standards. A survey found that most farmers visually evaluated shrimp by checking size, weight and signs of disease before harvesting. 

In ongoing trials of greenhouse-enclosed intensive biofloc shrimp culture systems, the objectives of a 2012 study were to evaluate the performance of fast-growth shrimp fed a commercial diet formulated for high-density culture systems, and to further evaluate injector performance in the zero-exchange, super-intensive raceways. 

The final article in a series about a project in Brunei to develop technology for production of black tiger shrimp focuses on the development of advanced grow-out ponds and practices with enhanced systems for biosecurity, sludge removal, water reuse, energy efficiency, automatic feeding and mechanical harvesting. 

A large-scale integrated shrimp aquaculture park (iSHARP) project in Malaysia is approaching completion of its first phase. Biosecurity is a priority at iSHARP. The design of each unit allows individual modules or ponds to be “locked down” to prevent disease from spreading.