Sentence examples for spawning age from inspiring English sources

In the North Sea, because there are no safe havens, few fish of spawning age are spared, hence the parlous state of stocks.

The no-harvest sanctuary was ordered because authorities say there has been a one-third drop in productivity and, of even greater concern, a 70percentt drop in the number of females of spawning age.

Tuna "ranching," a practice by which the fish are herded into huge circular nets and fattened up before slaughter, was for a time seen as a solution until it was shown to be part of the problem: as fewer bluefins were allowed to reach spawning age, there were fewer and fewer new fish to fatten.

"The big question is, how long is it going to last?" Given that it takes some big fish years to reach spawning age, the death of larvae and juvenile fish could have consequences that might not show up for a long time.

The sampled scales were used for aging, back-calculation of growth and determination of spawning age and frequency.

Many fish are small, some below spawning age.

For the age at which energy is first diverted to reproduction, we used T = 1, so that fish start spawning at age 2. In our model, the length of fish of age 2 years was usually larger than 40 cm (the smallest length was 36 cm in the unexploited case).

If YOY cannot mature and spawn at age 1, we always predict age 1 smolts unless emigrant survival is low and freshwater survival is high, in which case we predict all fish mature and become freshwater residents.

Ms. Boyd said this ran counter to the goal of getting parents more constructively involved in children's online activities, which was one aim of the legislation that spawned the age restrictions in the first place.

This is because fish achieve 150 mm length shortly after the first spawning, thus there is little difference in cumulative mortality risk between waiting to spawn at age 1 and waiting to emigrate later that same year.

The extent to which changes in growth rate can favor mature female parr depends on their physiological capacity to spawn at age 1, a capacity that has not yet been adequately examined under natural or near-natural conditions.