News features and technical articles about the evolution of aquaculture, one of the world’s fastest growing industries.

salinity

Responsibility

Salinity in aquaculture, Part 2

Prof. Boyd on how to measure salinity in aquaculture, examining electrical conductivity (specific conductance), density, chlorinity and refractive index. 

Responsibility

Salinity in aquaculture, Part 1

Prof. Boyd discusses the various definitions of salinity as an environmental factor of importance which, in aquaculture settings, can be easily measured. 

Responsibility

The importance of water analysis in aquaculture

Proper monitoring of water quality in aquaculture production systems is critical to enable appropriate and timely management decisions. It requires reliable equipment, trained technicians that follow instructions and apply quality control measures, proper reagents and calibrated equipment, and appropriately collected 

Responsibility

Water composition: Dissolved inorganic solids

A few anions and cations, and un-dissociated silicic acid represent the largest fraction of dissolved inorganic solids in water. The total concentration of ions is called the salinity. The total dissolved-solids concentration usually is roughly equal to salinity in freshwater. 

Responsibility

TAN, other water quality factors affect nitrification rates in biofilters

An important criterion when studying biofilters is the conversion rate of total ammonia nitrogen (TAN) to nitrate-nitrogen in production water. Although nitrification rates have been based on media surface areas, they do not always reflect the actual nitrification achieved. Volumetric 

Health & Welfare

Low-salinity culture water controls Vibrios in shrimp postlarvae

In a survey of Vibrio concentrations in white shrimp postlarvae at two inland farms, hatchery postlarvae were acclimated in water with salinity reduced from 30 and 5 ppt to 2 ppt at the farms. One farm stocked postlarvae in nursery 

Health & Welfare

Salinity tolerance of Gulf corvina, prospective aquaculture species

After six weeks of experimental culture, comparable growth and survival were recorded in juvenile Gulf corvina raised at salinities of 5, 15, 25 or 35 ppt. Coupled with stable plasma osmolality values observed in fish at the varied salinities, these