What really makes fish become sexually active

What really makes fish become sexually active

What really makes fish become sexually active

Mandarin fish mating. Image by Klaus Stiefel, Flickr.

Discounting anthropogenic-induced changes, the seasonally oscillating environments where long-lived fish hatch and grow remain more or less the same throughout the course of their lives. This means that the common explanation that states that fish become sexually active – or spawn for the first time – after experiencing certain environmental stimuli does not properly explain this phenomenon.

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High cod catches could have been sustained in Eastern Canada for decades, simple stock assessment method shows

High cod catches could have been sustained in Eastern Canada for decades, simple stock assessment method shows

High cod catches could have been sustained in Eastern Canada for decades, simple stock assessment method shows
Fishing for Atlantic cod off the southern coast of Fogo Island, Newfoundland. Photo by Phillip Meintzer, Wikimedia Commons.

A simple fish stock assessment model applied to over 500 years of catch data demonstrated that if Canadian authorities had allowed for the rebuilding of the stock of northern Atlantic cod off Newfoundland and Labrador in the 1980s, annual catches of about 200,000 tonnes could have been sustained.

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A few missing fish US West Coast recreational and discarded catches

A few missing fish: US West Coast recreational and discarded catches

A few missing fish US West Coast recreational and discarded catches

Recreational fisher at Baker Beach, California. Photo by mgstanton, Flickr.

Despite being the leading country when it comes to transparency, public accessibility, and free availability of fisheries data, the United States of America’s lack of international reporting of recreational catches and fish discarded at sea may hinder proper ecosystem-based management efforts, new research has found. Continue reading