Health & Welfare

Shrimp nursery systems offer an important opportunity to increase profits. Properly designed and operated nurseries are highly biosecure facilities to grow postlarvae at very high densities. 

EU legislation requires farmed fish be spared unnecessary pain, distress or suffering at slaughter, and efficient manual and automated systems have been developed to help achieve this goal. What’s more, longer shelf life and improved flesh quality have been reported. 

Cleaning is part of the daily management to ensure adequate rearing conditions, but additional water treatment is occasionally required to further improve the water quality. A disinfectant like sodium percarbonate can reduce the bacterial load. 

An over-reliance on medical and chemical controls, along with warming waters, led to a surge in sea lice. With such treatments waning in effectiveness, operators turn to other, safer measures. 

The presence of AHPND-Vibrio parahaemolyticus can be detected both in fecal DNA samples and in the enriched bacterial broth with samples of enrichment broth showing increased sensitivity. 

This study tested five diets formulated with increasing levels of methionine (Met) and Met + cysteine (Cys) and their effect on growth performance of juvenile Pacific white shrimp stocked at 50, 75 or 100 animals/m2 in a green water system. 

Arun Dhar, Ph.D. will attempt to fill the “big shoes” of Dr. Donald Lightner at the University of Arizona’s Aquaculture Pathology Laboratory, where the shrimp disease EMS was diagnosed. 

Aquamimicry simulates natural, estuarine production conditions by creating zooplankton blooms as supplemental nutrition to the cultured shrimp, and beneficial bacteria to maintain water quality. Better-quality shrimp can be produced at lower cost and in a more sustainable manner.  

Two virulence genes are known to encode a binary photorhabdus insect-related toxin that causes acute hepatopancreatic necrosis disease in shrimp. The pathogenicities of these V. campbellii strains were evaluated through laboratory infection and subsequent histological examination in P. vannamei shrimp. 

A study tested the use of biofloc technology to improve the productivity of the fathead minnow (Pimephales promelas) a commercially important baitfish in North America. 

A study conducted in Huila, Colombia, tested the effects of the feed additive potassium diformate on the performance of juvenile tilapia. Results showed an enhanced fish productivity index, lower mortality and improvements in weight gain. 

Realizing higher growth rates in commercially cultured shrimp has many important benefits, including reducing various risks, cutting costs and increasing economic opportunities. Shrimp genetics primarily determines the amount of additional growth that can be achieved, as shrimp typically reflect their parents’ growth rates. 

A study aimed to determine safe levels of ammonia and nitrite to various life stages of the Amazon river prawn, based on the hypothesis that the early stages of development of M. amazonicum are more sensitive to ammonia and nitrite than later stages. The monitoring of this variable is important to avoid losses, mainly in larviculture and recirculation. 

Attention to pH, a numeric scale used to specify the acid or alkaline condition of an aqueous solution, is very important. Reducing biomass and feeding rates together with phytoplankton control and liming can often keep pH at desirable values. 

A new breeding program for genetic improvement of Indian white shrimp (Fenneropenaeus indicus) in Egypt was established at a private shrimp farm at AL Dibah Triangle Zone (DTZ) to develop disease-resistant shrimp for the country’s aquaculture industry.