Restrictions on Fisheries in the Multi-Level System of Governance (‘Cascade System’) in Light of EU Law
© Lexxion Verlagsgesellschaft mbH (10/2011)
Overfishing has very negative consequences for the food web; not only for the ‘target species’ but for the marine ecosystem as a whole. It also impacts on biodiversity, which must be preserved and, where necessary, restored. The establishment of protected areas is currently one of the instruments recognised as a means to facilitate the con-servation of marine ecosystems.

Use of GIS, remote sensing and regression models for the identification and forecast of small pelagic fish distribution
© Aristotle University of Thessaloniki (6/2009)
Accurate techniques that are able to identify potential distributions of small pelagic fish in any spatial or temporal scale are essential tools for fisheries management purposes. Additionally, knowledge on small pelagic species distribution could be used for the proper sampling strategy designation and decision making for effective management.

An approach for sustainable management of the Balikligol lakes, Turkey
© Aristotle University of Thessaloniki (6/2009)
The Balikligol Lakes in Sanliurfa, Turkey (Lake Ayn-i Zeliha and Lake Halil-ur Rahman) are freshwater lakes, which possess not only environmental value but also touristic value due to their natural aquarium look and their historical and sacred status in the past and present. From time to time, fish deaths have been encountered in these lakes. Deteriorating water quality could harm the health of the fishes in the water. Therefore, the water quality at both of the lakes needs to be monitored. The pollution at the lakes exceeding the acceptable levels endangers the sustainable management of the living creatures.

The variation of the seawater/freshwater interface at the coastal aquifer in Yongho bay, Busan
© Aristotle University of Thessaloniki (6/2009)
This study site is the coastal aquifer in Yongho bay, Busan and is intruded by seawater. Aquifer media are formed reclaimed sedimentary layer, weathered soil layer, weathered breccia layer and bedrock. The bedrock consists of tuffaceous sedimentary rock, andesite and andesitic volcanic breccia. A monitoring well is approximately 180 m away from the coastal line. The developed and casing depth of the monitoring well are 120 m and 19 m below ground surface, respectively.

Regional differences in trace element concentrations in Anadara spp. Mollusca: Bivalva) collected from the coast of South Vietnam
© Aristotle University of Thessaloniki (6/2009)
We measured accumulation of 21 trace elements in blood cockles, Anadara spp., collected from the South Key Economic Zone, Mekong River Delta (MRD), and Central Coastal Zone (CCZ) in Vietnam. Concentrations of As, Sr, Mo, Sn and Pb were higher in CCZ blood cockle than in those from the other two regions, whereas Hg concentration was elevated in MRD samples.

The impacts of fish farms on marine ecosystem
© Aristotle University of Thessaloniki (6/2009)
Aquaculture has a number of economic and social benefits. But it can cause environmental problems if it is not taken adequate environmental precautions. On the one hand, it can cause biological pollution on marine environment. For example, fish that escape from aquaculture facilities may harm wild(indigenous) fish populations through competition and interbreeding, or by spreading diseases and parasites.

Comparing novel approaches used for prediction of species distribution from presence/absence acoustic data
© Aristotle University of Thessaloniki (6/2009)
Accurate modelling and prediction of fish spatial distributions, based on sampled data, provide essential information for management purposes and stock monitoring. This study compares current and novel modelling techniques, in order to justify their suitability and accuracy on acoustic data. Ten different Resource Selection Functions were tested, and Receiver operation Characteristic and Area Under Curve indicated that Boosted Regression Trees and Generalized Additive Models appear to fit acoustic data more efficiently. The corresponding probability maps also indicated that these functions produce accurate species distribution patterns when used with presence/absence data.

Ecological risk assessment of cheese whey effluents along a mediumsized river in southwest Greece
© Aristotle University of Thessaloniki (6/2009)
An ecological risk assessment of cheese whey effluents was applied in three critical sampling sites located in Vouraikos river (southwest Greece), while ecological classification using WFD 2000/60/EU criteria allowed a direct comparison of toxicological and ecological data. Two invertebrates (Daphnia magna and Thamnocephalus platyurus) and the zebra fish Danio rerio were used for toxicological analyses, while, the aquatic risk was calculated on the basis of the risk quotient (RQ = PEC/PNEC).

Concepts for a decentralized treatment of waste and wastewater
© European Compost Network ECN e.V. (5/2003)
Integrated concepts for the decentralized treatment of waste and wastewater are more and more considered. The reason for this approach is – amongst others - the knowledge that resources are limited and that solutions should address aspects of sustainability.



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