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.

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 April 17, 2014 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 April 17, 2014).

Share This



More Plants & Animals News

Thursday, April 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

The Great British Farmland Boom

The Great British Farmland Boom

Reuters - Business Video Online (Apr. 17, 2014) Britain's troubled Co-operative Group is preparing to cash in on nearly 18,000 acres of farmland in one of the biggest UK land sales in decades. As Ivor Bennett reports, the market timing couldn't be better, with farmland prices soaring over 270 percent in the last 10 years. Video provided by Reuters
Powered by NewsLook.com
Flamingo Frenzy Ahead of Zoo Construction

Flamingo Frenzy Ahead of Zoo Construction

AP (Apr. 17, 2014) With plenty of honking, flapping, and fluttering, more than three dozen Caribbean flamingos at Zoo Miami were rounded up today as the iconic exhibit was closed for renovations. (April 17) Video provided by AP
Powered by NewsLook.com
Change of Diet Helps Crocodile Business

Change of Diet Helps Crocodile Business

Reuters - Business Video Online (Apr. 16, 2014) Crocodile farming has been a challenge in Zimbabwe in recent years do the economic collapse and the financial crisis. But as Ciara Sutton reports one of Europe's biggest suppliers of skins to the luxury market has come up with an unusual survival strategy - vegetarian food. Video provided by Reuters
Powered by NewsLook.com
Could Even Casual Marijuana Use Alter Your Brain?

Could Even Casual Marijuana Use Alter Your Brain?

Newsy (Apr. 16, 2014) A new study conducted by researchers at Northwestern and Harvard suggests even casual marijuana use can alter your brain. Video provided by Newsy
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:
from the past week

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