6 resultados para 1995_08060227 CTD-93 4902603
em Aquatic Commons
Resumo:
Fischarten im Nordostatlantik, die eine besondere Bedeutung für die deutsche Fischerei haben, sind Kabeljau, Schellfisch; Seelachs und Rotbarsch. Vieles aus der Biologie und über die verbreitung dieser wichtigen Nutzfische ist bekannt. Dennoch geben die großen Bestandsveränderungen sowohl der Fischerei wie auch der Fischereiwissenschaft immer wieder Rätsel um ihre Ursachen auf. Man kann vermuten, dass es ökologische oder klimatische, hydrologische oder fischereiliche Gründe sind, die solche Bestandsfluktuationen herbeiführen. Die Aufgabe der Wissenschaft ist es, die wahre Ursache nachzuweisen.
Resumo:
Dormancy has been observed in several species of Cyclops. Animals in dormancy are characterised by almost complete inactivity of the main appendages and sluggish intestinal peristalsis. In Cyclops vicinus dormancy can take place in copepod stages III (19%), IV (78%) and V (3%) but one and the same animal only in one developmental stage. The author gives his own results between frequency of dormancy and photoperiod (20 C, 1000 lux). He concludes that dormancy in C. vicinus can be influenced by day length and can be ended prematurely by short day length.
Resumo:
This document is a collection of legislative documents relating to fisheries, especially Statutory Instruments, with special regards to the county Cumbria in the north of England. This includes Orders on salmon and trout spanning the years 1950-1993.
Resumo:
The National Marine Fisheries Service (NMFS) Cooperative Shark Tagging Program (CSTP) is part of continuing research directed to the study of the biology of large Atlantic sharks. The CSTP was initiated in 1962 at the Sandy Hook Laboratory in New Jersey under the Department of Interior's U.S. Fish and Wildlife Service (USFWS). During the late 1950's and early 1960's, sharks were considered a liability to the economy of resort communities, of little or no commercial value, and a detriment to fishermen in areas where sharks might damage expensive fishing gear or reduce catches of more commercially valuable species.
Resumo:
The Nutrient Enhanced Coastal Ocean Productivity (NECOP) Program is a component of NOAA's Coastal Ocean Program. The central hypothesis of this research is: Anthropogenic nutrient inputs have enhanced coastal ocean productivity with subsequent impacts on coastal ocean water quality, living resource yields, and the global marine carbon cycle. The initial study area for this program is the Mississippi/Atchafalaya River Outflow and adjacent Louisiana shelf region.