Featured Research

from universities, journals, and other organizations

Eight species of wild fish have been detected in aquaculture feed

Date:
April 25, 2012
Source:
Plataforma SINC
Summary:
Researchers have for the first time analyzed a DNA fragment from commercial feed for aquarium cichlids, aquaculture of salmon and marine fish in aquariums. The results show that in order to manufacture this feed, eight species of high trophic level fish have been used, some of them coming directly from extractive fisheries.

This image shows the aquaculture of salmon.
Credit: Norsk Havbrukssenter

Researchers from the University of Oviedo have for the first time analysed a DNA fragment from commercial feed for aquarium cichlids, aquaculture of salmon and marine fish in aquariums. The results show that in order to manufacture this feed, eight species of high trophic level fish have been used, some of them coming directly from extractive fisheries.

Related Articles


Aquaculture initially came as an ecological initiative to reduce pressure from fishing and to cover human food needs. However, a problem has emerged: consumers prefer carnivore species, like salmon and cod that require tons of high quality protein for their quick, optimum development.

"If these proteins are obtained from extractive fisheries, aquaculture stops being an alternative to over-fishing and starts contributing to it, turning it into a risk for natural marine ecosystems" Alba Ardura, lead author of the study published in 'Fisheries Research' and researcher in the department of Functional Biology at the University of Oviedo said.

The research team analysed a DNA fragment from commercial feed made for aquarium cichlids, aquaculture of salmon and marine fish in aquariums. After removing oil and fat from the feed, DNA sequences were obtained and compared with public databases to identify the species found.

From fish feed samples, supplied by manufacturers and bought in animal shops, researchers identified eight species of wild marine fish that were from high trophic levels in the food chain.

Industrial waste from processing and commercialisation for human consumption of Peruvian anchoveta (Engraulis ringens), European sprat (Sprattus sprattus), Pacific cod (Gadus macrocephalus), whiting (Merlangius merlangus), Atlantic herring (Clupea harengus), Pacific sandlance (Ammodytes personatus), jack mackerel (Trachurus symmetricus), and blue mackerel (Scomber australasicus), allow fish meal for aquaculture fish to be made.

Nonetheless, according to the researcher "some of the species found in this feed are commercialised fresh without being processed and they suspect that they came to the feed directly from extractive fisheries." This is the case with herring and Pacific sandlance.

The research suggests that aquaculture is partly maintained by fisheries, and aquaculture fishes are fed by wild fish sold "whole" (without being processed) and fresh directly from fishing vessels.

Vegetable proteins, an alternative

"If species from extractive fishing are used to feed farm fish, aquaculture does not help minimise over-fishing" warns the expert who suggests "urgently" revising the composition of aquaculture feed to replace them with other proteins. The aim is to reduce the exploitation of natural fish populations.

Ardura proposes increasing efforts to gain high quality proteins from other sources, such as vegetable proteins, which supplement farmed fish's nutritional needs. This way they will be able to "minimise the impact of aquaculture on wild populations."


Story Source:

The above story is based on materials provided by Plataforma SINC. Note: Materials may be edited for content and length.


Journal Reference:

  1. A. Ardura, J.L. Horreo, E. Hernandez, A. Jardon, I.G. Pola, J.L. Martinez, E. Garcia-Vazquez. Forensic DNA analysis reveals use of high trophic level marine fish in commercial aquaculture fish meals. Fisheries Research, 2012; 115-116: 115 DOI: 10.1016/j.fishres.2011.08.011

Cite This Page:

Plataforma SINC. "Eight species of wild fish have been detected in aquaculture feed." ScienceDaily. ScienceDaily, 25 April 2012. <www.sciencedaily.com/releases/2012/04/120425094404.htm>.
Plataforma SINC. (2012, April 25). Eight species of wild fish have been detected in aquaculture feed. ScienceDaily. Retrieved March 26, 2015 from www.sciencedaily.com/releases/2012/04/120425094404.htm
Plataforma SINC. "Eight species of wild fish have been detected in aquaculture feed." ScienceDaily. www.sciencedaily.com/releases/2012/04/120425094404.htm (accessed March 26, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Thursday, March 26, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Jockey Motion Tracking Reveals Racing Prowess

Jockey Motion Tracking Reveals Racing Prowess

Reuters - Innovations Video Online (Mar. 26, 2015) Using motion tracking technology, researchers from the Royal Veterinary College (RVC) are trying to establish an optimum horse riding style to train junior jockeys, as well as enhance safety, health and well-being of both racehorses and jockeys. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Botswana Talks to End Illegal Wildlife Trade

Botswana Talks to End Illegal Wildlife Trade

AFP (Mar. 25, 2015) Experts are gathering in Botswana to try to end the illegal wildlife trade that is decimating populations of elephants, rhinos and other threatened species. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com
Elephants Help Keep 18-Wheeler From Toppling Over

Elephants Help Keep 18-Wheeler From Toppling Over

Newsy (Mar. 25, 2015) The Natchitoches Parish Sheriff&apos;s Office discovered two elephants keeping a tractor-trailer that had gotten stuck in some mud upright on a highway. Video provided by Newsy
Powered by NewsLook.com
Baby 'pet' Orangutan Rescued from Chicken Cage Takes First Steps

Baby 'pet' Orangutan Rescued from Chicken Cage Takes First Steps

Reuters - Light News Video Online (Mar. 25, 2015) Buti, a baby orangutan who was left malnourished in a chicken cage before his rescue, takes his first steps after months of painful physical therapy. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins