Shipyards Ebooks Catalog
Zeiform fishes are carnivores they feed mainly on a variety of fishes but also consume cephalopods and crustaceans. Juveniles of the larger species and adults of the dwarf dories (family Zeniontidae) and tinselfishes (family Grammicolepi-dae) feed on zooplankton (e.g., copepods, pteropods, fish and crustacean larvae). Adults of the larger zeiform fishes (John dory and the buckler dory) are eaten only by large piscivorous predators (e.g., some sharks, goosefishes Lophus species , and lancetfishes Alepisaurus species ). Juveniles and adults of small zeiforms (e.g., Zenion species) are subject to predation by a variety of piscivores.
The John dory is a broadcast spawner. The eggs and sperm are shed simultaneously into the water, where fertilization takes place. In the northeastern Atlantic, spawning occurs in April or May. The eggs and larvae are pelagic the eggs are small (0.1 in or 2 mm diameter) and spherical, with a large oil globule. No nest building or parental care has been reported for the species. In the North Atlantic, John dory males mature in their second or third year at a length of about 10 in (26 cm), and they may live to an age of 13 years. Females are three or four years old when they become mature at a length of 14 in (35 cm). They grow larger than males do, and they may live 15 years. In New Zealand waters males attain maturity at 11.8 in (30 cm) in two years their growth then slows considerably, with a maximum size of about 15.7 in (40 cm) and an age of nine years. Females grow faster and attain a maximum size of about 18.1 in (46 cm) and an age of nine years.
The body is deep, compressed, and oblong to disk-shaped. The upper jaw is more or less protrusible, and there are minute, slender, conical teeth in the jaws and vomer. Adults range in size from the dwarf dory (Zenion hololepis) at 4 in (10 cm) to the 3-ft (90 cm), 12-lb (5.3 kg) South African Cape dory (Zeus capensis). Most species are silvery, bronzy, brown, or reddish. The John Dory is silvery or bronzy, with indistinct longitudinal dark stripes from head to tail and a conspicuous white or yellow-edged black ocellus in the middle of the body. The juvenile buckler dory (Zenopsis conchifer) is silvery and covered with scattered, vaguely defined black spots. Dories can change from silvery to dark brown or gray in seconds. Males and females are colored similarly.
The circumstances of immigrants' transit to and entry into the U.S. may have serious implications for their health and the delivery of health care. A particularly unusual case illustrates the need for health care providers in urban areas to be aware of the conditions associated with illegal immigration and the associated health risks. This case involved the Honduran-registered ship Golden Venture, which ran aground off the Rockaway Peninsula in Queens, New York carrying 289 Chinese passengers following a failed attempt to rendezvous with smaller ships that would carry the passengers to the shores of the U.S. illegally. Ten of the passengers died from hypothermia or drowning (Metropolitan Desk, 1993), a number disappeared after receiving treatment at local hospitals (McFadden, 1993), and the remainder were taken into custody by the INS. A few of those who were detained were
A study (96) of occupations in a national death certificate database found an elevated mortality odds ratio of PD below age 65 in welders. However, there was no elevated mortality in the entire population of welders. A study (97) of Danish metal-manufacturing employees' hospitalization rates found no elevation in hospitaliza-tions for PD. PD is not typically a primary cause of hospitalization or death, although parkinsonian symptoms may contribute to morbidity from other diseases. Therefore, mortality rates and hospitalizations may not be sensitive indicators of parkin-sonism. Furthermore, the health and safety commitment in the Danish shipyards may be substantially greater than in the United States. A recently published study (98) in Sweden found no relationship between welding and PD in Sweden using nationwide, population-based registers. These methods are likely more sensitive than hospitalization data, but the findings do not necessarily preclude a greater risk of parkinsonism...
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