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

ammonia

Responsibility

Ammonia nitrogen dynamics in aquaculture

The major sources of ammonia in aquaculture ponds are fertilizers and feeds, and problems with high ammonia are most common in feed-based aquaculture. 

Responsibility

Phytoplankton in aquaculture ponds: Friend or foe?

A vigorous phytoplankton bloom will support a healthy benthic community and will contribute significantly to stabilising and maintaining adequate pond water and bottom quality. 

Aquafeeds

Understanding the oxygen demand of aquafeeds

Manufactured aquafeeds, if improperly managed, can result in undesirable oxygen demand that can reduce dissolved oxygen levels and pollution through effluents, and stress cultured animals. 

Responsibility

The promise of In-Pond Raceway Systems, part 1

A promising strategy to increase fish production in static aquaculture ponds, the In-Pond Raceway System (IPRS) grows fish confined at high densities in floating or fixed raceways, instead of the animals being free in the pond. 

Health & Welfare

El parámetro de calidad del agua a menudo ignorado: pH

La atención al pH, una escala numérica usada para especificar la condición ácida o alcalina de una solución acuosa, es muy importante. La reducción de la biomasa y de las tasas de alimentación junto con el control del fitoplancton y 

Health & Welfare

Determining safe levels of ammonia and nitrite for shrimp culture

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 

Health & Welfare

The oft-overlooked water quality parameter: pH

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. 

Intelligence

Biofloc technology production promising in temperate zones

A study was conducted to assess the feasibility to grow Channel catfish (Ictalurus punctatus) in an outdoor biofloc system during winter in a temperate zone. High biomasses of market-size channel catfish were successfully maintained through the winter with high survival 

Health & Welfare

Biofilter inoculation in recirculating aquaculture systems

Biological filters are essential parts of recirculating aquaculture systems that transform toxic fish compounds such as ammonium and nitrite into less-harmful nitrate. The authors tested the convenience and efficiency of three methods for the initial inoculation of aerobic biofilters. 

Innovation & Investment

Estimating biofilter size for RAS systems

Controlling total ammonia-nitrogen (TAN) concentrations is the primary concern when sizing a biofilter for use in a recirculating aquaculture system. Sizing decisions are best based on previous experience with a given biofilter media in a specific biofilter configuration.