Tag David D. Kuhn

Mushiness of shrimp tails is often associated with head-on shrimp. Results from the authors’ study, however, indicated that texture values did not vary much between headless and head-on shrimp stored over a two-week period at 4 degrees-C. 

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. 

Environmental and other challenges have led to reduced harvests of wild oysters in the United States. In a study, the authors evaluated oysters cultured in a recirculating aquaculture system with zero water exchange for several months. 

Research found that tobacco dust applied in culture water killed ramshorn snails within three days and did not compromise channel catfish. 

Shrimp exposed to high concentrations of nitrate exhibit shorter antennae, gill abnormalities and hepatopancreas lesions. Nitrate toxicity is more of an issue for shrimp raised in lower-salinity waters. 

Healthy populations of both ammonia- and nitrite-oxidizing bacteria must be present in aquaculture systems to support the nitrification of potentially toxic ammonia to nitrite, with further oxidation to less problematic nitrate. 

Single-celled proteins in bioflocs can provide protein and other nutrients in shrimp feed, but what makes them enhance growth performance in shrimp? 

Recent research is demonstrating that biofloc-based proteins are suitable replacements for fishmeal in aquaculture diets. Since bioflocs can be produced while treating aquaculture effluents, a waste product can be converted into a valuable resource. 

In pilot-scale research, researchers found that both sequencing and membrane batch reactors removed ammonia, nitrite and suspended solids with great efficacy.