Friday, August 7, 2020

Enviro Ceramic celebrates 10 years of their micro bubble diffuser

Enviro Ceramic was founded just over 10 years ago as a result of the plight of fish farmer Gavin Carter, who needed to make a ceramic oxygen diffuser for his RAS system in Mtunzini, South Africa.

He approached his friend and ceramic engineer Kurt Holztrager and within a couple of months of brainstorming ideas they came up with the current design of the diffuser and a novel way to manufacture the ceramic membrane and resin housing. The company Enviro Ceramic CC was first registered in July 2010.
Enviro Ceramic's micro bubble diffuser
Image credit: Enviro Ceramic

Enviro Ceramic's micro bubble diffusers have a patented round design and hole in middle, this creates as a parachute effect when submerging the diffuser so that it preferably always lands on the tank floor facing up.

This also creates an air lift of the water into the bubble stream, making it very efficient. The resin housing and stainless-steel fittings are to prevent galvanic corrosion, while some competitors use brass/aluminium that can lead to corrosion.

In later years the anti-microbial ceramic was invented and is proving beneficial to keep the ceramic pores open, a feature that competitor's diffusers do not have and is a major cause of replacements.

In 2015 they moved to Cork, Ireland, and Enviro Ceramic Ltd has grown from strength to strength with the valued support in marketing with Dietmar Firzlaff from aquaFUTURE e.K. who connected them worldwide into the aquaculture industry.

For more information visit the Enviro Ceramic website, HERE.

The Aquaculturists

Thursday, August 6, 2020

How do dietary methionine sources and feeding frequency impact the post feed hemolymph methionine levels in whiteleg shrimp?

by Dr Karthik Masagounder, Head Aqua and Swine Research, Evonik Nutrition and Care GmbH, Germany and Dr D Allen Davis, Professor, Auburn University, USA

An in-vitro study based on the enzymes extracted from shrimp hepatopancreas showed that shrimp are able to completely cleave the four available isomers of DL-methionyl-DL-methionine (AQUAVI® Met-Met) but at different rates. This allows delayed liberation and absorption of D- and L- Methionine (Met) in the digestive tract. However, no in-vivo data were published showing changes in the postprandial profile of Met in the hemolymph – a fluid analogous to the blood in vertebrates – of shrimp fed different Met sources.

We therefore instigated a study to investigate and compare postprandial Met levels in relation to other amino acids in the hemolymph of whiteleg shrimp fed diets supplemented with AQUAVI® Met-Met or DL-Met. The effects of different sources on the Met levels of shrimp hemolymph were evaluated under two feeding frequencies (once per day and three times per day) to understand if the feeding frequency would influence the dietary effects on the hemolymph Met levels.

Met is typically the first limiting amino acid in the practical shrimp feed and therefore its supplementation is essential. Previous studies showed that AQUAVI® Met-Met is a more efficient Met source ( 200%) for shrimp compared with DL-Met (Xie et al. 2017; Niu et al. 2018). Better bioavailability of AQUAVI® Met-Met versus DL-Met is attributed mainly to (i) its less water solubility and leaching and (ii) slow and long release of Met from different sterioisomers (DL-Met-Met, LD-Met-Met, LL-Met-Met, DD-Met-Met).

Read more, HERE.

The Aquaculturists

Phibro Aqua company profile

Phibro Aqua is a division of Phibro Animal Health Corporation, a diversified global developer and manufacturer of a broad range of animal health and nutrition products for the poultry, swine, cattle, dairy and aquaculture markets.

Growing worldwide demand for high quality protein, combined with expanding human populations and decreasing wild stocks of fish, assures an increased future dependence on aquaculture products and technologies.

The challenge is to develop profitable and sustainable aquaculture practices which will implement advanced technologies. These technologies will allow aquaculture to make a significant contribution to future supplies of aquatic products.

Phibro Aqua has developed a strong team of fish health specialists and scientists with a focus on providing the global aquaculture industry with cost effective health management solutions in order to maximize the productivity of their customer’s farms. This Phibro Aqua team brings customers a full range of expertise in production and operation, fish health management, disease diagnosis and vaccination.

Phibro Aqua operates comprehensive Research and Development facilities. These facilities include a large scale wet lab for clinical evaluation of fish vaccines, medication and feed additives. Phibro Aqua's lab includes a full diagnostic service addressing parasitology, bacteriology, histopathology and molecular-biology.

Visit the Phibro Aqua website, HERE.

The Aquaculturists