KRILL – A VITAL OCEAN FORAGE SPECIES


THE VISUALS

Euphausia_gillsFilterkrillkils2image1Krill_swarmKrillanatomykilsKrillmeatkilsNauplius_HatchingNematoscelis_difficilis_femalePleopods_euphausia_superba

THE STORY

CONCERNS: The health of the oceans depends on a complex food web which ultimate depends on the sun providing energy for photosynthesis by tiny plants called phytoplankton which, in turn, serve as food for equally tiny little sea animals called zooplankton. They are feed for larger zooplankters one of which is the wildly prolific and abundant Krill that is vital to larger fish, birds, marine mammals and ultimately man. The illustration above provides a much simplified example of
this “food web” as it occur in the Bay of Fundy. Unfortunately, krill have become targeted as a commercial species. Large-scale fishing developed in the late 1960s and early 1970s, and now occurs only in Antarctic waters and in the seas around Japan. In 1993, two events caused a decline in krill fishing: Russia exited the industry; and the Convention for the Conservation of Antarctic Marine Living Resources (CCAMLR) defined maximum catch quotas for a sustainable exploitation of Antarctic krill. After an October 2011 review, the Commission decided not to change the quota.

The annual Antarctic catch stabilised at around 100,000 tonnes, which is roughly one fiftieth of the CCAMLR catch quota. The main limiting factor was probably high costs along with political and legal issues. The Japanese fishery saturated at some 70,000 tonnes.[As of 2003 experimental small-scale harvesting was being carried out in other areas, for example, fishing for Euphausia pacifica off British Columbia and harvesting Meganyctiphanes norvegica, Thysanoessa raschii and Thysanoessa inermis in the Gulf of St. Lawrence. These experimental operations produce only a few hundred tonnes of krill per year, indicating that any large-scale harvesting operations in these areas are unlikely due to opposition from local fishing industries and conservation groups. (Based on Wikipedia text)

THE RESOURCES

1. Get the whole story as a PDF or order printed copies. Here

2. Access the Resource File … media, articles, references and more. Here

 

 

Advertisements

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s