Menakhem Ben-Yami

The Red Sea lizardfish, Saurida undosquamis(Richardson), invaded the Levant Basin and established a population of considerable commercial importance. Its expansion came at the expense of other commercial fishes on which it preys and with which it competes. The explosion ofthe Red Sea lizardfish population in the Levant Basin was made possible by a combination of changes in the environmental conditions (abiotic and biotic), one of these being the retreat of, or the recession in, the native hake population. The dynamic coexistence between the lizardfish and the hake, its main competitor, is affected by fluctuations in the abiotic conditions to which the hake seems to be more sensitive than the lizardfish. A faunistic, zoogeographical approach to the marine animal migration through the Suez Canal is common to most investigators of the canal's influence. Animal species native to one sea and found in the other after the opening of the canal serve as main indicators ofits biological influence and of its effectivity as a link to the migrant species and as a barrier to others (Ben-Tuvia, 1966, in press; Kimor, 19703 ; Por, 1971; Steinitz, H., 1968; Steinitz, W., 1929; Thorson, 1971). Many ), suggesting that the mechanism of the penetration of some species through the canal and their expansion in the Mediterranean is associated with environmental conditions (salinity, currents, nature ofsubstrate, etc,). In this paper we discuss the ecology of the mi­ gration and expansion in the new habitat of an important commercial fish. We examine its dynamic coexistence with its native competitor in view of the changing environmental conditions. The Relative Importance of Species

... M. La atracción de peces con luz (Colección FAO: Capacitación. ... LA ATRACCIÓN DE PECES CON LUZ Page 10. Page 11. QUE ES LA ATRACCION CON LUZ Cuando las moscas y las abejas acuden a la miel que se ha dejado en un plato decimos que son atraídas por la miel. ...

14 TA Jefferson behaviour patterns were being observed at these times. Notes on the age/sex composition of porpoise groups were recorded when the animals were seen well, following the classification scheme of Jefferson (1990). Calves and juveniles can be reliably dis- ...

M. Ben-Yami Column WORLD FISHING, MARCH 2013 BLOWING IN THE WIND The American commercial fisheries seem to find themselves in a sort of a siege. According to voices coming from the affected fishermen and the local press serving fishing ports and communities, on the top of being plagued for the last four years by the adverse catch-share system, they had been hurt by the mega-spill of oil in the Mexican Bay, severely injured by the recent hurricane Sandy and struggled, evidently in vain, for obtaining their share in the related federal damages. The way the wind blows. Recently, the East Coast fishermen have been alarmed by a new threat hanging over their heads: the plans of constructing a gargantuan network of offshore wind-power farms that would be stepping hard on their fishing tows. For example, in Southern New England off Connecticut, Rhode Island, Massachusetts, and Long Island, two hundred 150-180-m tall wind turbines are supposed to be erected on lease sites overlapping the spa...

Many marine scientists and fisheries managers have made their schooling or scholarships in fisheries science and management in Western European and North American countries. Some of them might've been coming from southern and eastern countries, where native science either hasn't yet developed locally, or has developed with different, often traditional approach. Notwithstanding, they would be very impressed with what they were taught at the various Western fisheries institutions. Coming back home they'd quite naturally be inclined to introduce in their national or local fisheries. A word of warning: West is not always the best. The author opines that uncritical copying of Western official fisheries science and management methodology is not only a bad thing to do, but also that those are often simply wrong even for their own fisheries. A fishery can be impoverished due to coastal and upstream pollution or destruction of inshore habitats essential for their reproduction and...

From Menakhem Ben-Yami Column World Fishing, May 2004 TRAWL FLOGGING AGAIN From time to time that or other NGO is waking up to blame the trawling industry for “bulldozering” the sea bottom and “devastating” bottom habitats. With some exceptions, such alarmist outbursts usually stem from either ignorance of the trawling practice and conditions, or from outright spite. They keep misleading the public at large and frustrate the industry. What can one say to innocent public bombarded by articles in press, TV shows and radio broadcasts that tell of the terrible trawls that destroy habitats and kill off bottom species, bringing about a calamity on our seas and oceans? These campaigns are not about overfishing. They’re about stop fishing. In April 1998, I wrote on this page: “The simple truth is that trawling grounds cover considerable parts of our planet's continental shelf. Each year trawlnets pass over any point of these grounds a few to tens of times and the trawl fishery yields co...