Turning the tide on bottom trawling

Turning the tide against tuberculosis.

Influence of Bottom Trawling on the Normal- Incidence Reflection Coefficient

A North Sea area characterized by muddy, sandy, and gravelly sediments is surveyed with a single-beam echo sounder operating at 12, 38, and 200 kHz. Closely spaced survey legs and a high repetition rate of five sounder pings per second allow the production of echo energy maps with a high spatial resolution. These energy maps reveal a series of string-like features, which are believed to be due ...

Rwanda turning tide on HIV/AIDS.

the tide of the HIV/AIDS epidemic as health experts report that the HIV prevalence rate in this small East African nation has fallen below 3% from a staggering 13% in the 1990s. The country has “dramatically” reduced the burden of HIV/AIDS by scaling up education and awareness programs, prevention activities and access to treatment, says Dr. Placidie Mugwaneza, head of HIV prevention at TRAC Pl...

Screening mammography: the turning of the tide?

that many of the legion of criticisms that have been placed at the door of the nbss simply do not hold up to scrutiny. But mud sticks, and so many observers who do not like the results of the nbss point again and again to the same " flaws. " One of Narod's most telling points is that the survival curves for the two arms of the Swedish trial continue to remain separate up to 29 years after the t...

Effects of bottom trawling on fish foraging and feeding

The effects of bottom trawling on benthic invertebrates include reductions of biomass, diversity and body size. These changes may negatively affect prey availability for demersal fishes, potentially leading to reduced food intake, body condition and yield of fishes in chronically trawled areas. Here, the effect of trawling on the prey availability and diet of two commercially important flatfish...