ULTIMO AGGIORNAMENTO BANCA DATI: 13/09/2024 13:00:57
Extensive ongoing degradation of coral reef habitats worldwide has lead to declines in abundance of coral reef fishes and local extinction of some species. Those most vulnerable are ecological specialists and endemic species. Determining connectivity between locations is vital to understanding recovery ...
Fish consumption has established benefits, including the promotion of cardiovascular health and pre- and neonatal brain and eye development, but local freshwater fish may be a source of contaminants that are especially harmful to fetuses and young children, such as the neurotoxic and developmentally ...
Mycotoxins affect poultry production by being present in the feed and directly causing a negative impact on bird performance. Carry-over rates of mycotoxins in animal products are, in general, small (except for aflatoxins in milk and eggs) therefore representing a small source of mycotoxins for humans. ...
Background Urinary tract infections (UTIs) are one of the most common bacterial infections with global expansion. These infections are predominantly caused by uropathogenic Escherichia coli (UPEC). Methods Totally, 123 strains of Escherichia coli isolated from UTIs patients, using bacterial culture ...
Change in oceanographic conditions causes structural alterations in marine fish communities, but this effect may go undetected as most monitoring programs until recently mainly have focused on oceanography and commercial species rather than on whole ecosystems. In this paper, the objective is to describe ...
In species with indeterminate growth, age-related size variation of reproductive competitors within each sex is often high. This selects for divergence in reproductive tactics of same-sex competitors, particularly in males. Where alternative tactics are fixed for life, the causality of tactic choice ...
Background Pigmentation patterns are one of the most recognizable phenotypes across the animal kingdom. They play an important role in camouflage, communication, mate recognition and mate choice. Most progress on understanding the genetics of pigmentation has been achieved via mutational analysis, ...
Yolk-sac fry of Goldfish (Carassius auratus gibelio) were exposed to various concentrations of Al and pH for 3, 7 and 10 days. In this study number of dead fish, total length of larvae, yolk sac length, swimming activity, the number of gill cover movements and the number of heart beat was measured. ...
Climate change is expected to alter species distributions and habitat suitability across the globe. Understanding these shifting distributions is critical for adaptive resource management. The role of temperature in fish habitat and energetics is well established and can be used to evaluate climate ...
Abstract In this study, the influence of different treatments was evaluated: nonwashing, washing in chlorinated water and washing/soaking in chlorinated water and sodium chloride on the quality of Nile tilapia (Oreochromis niloticus) fillets during storage at 1.0 ± 0.5°C through daily analysis of pH, ...
Background Developing a water quality index which is used to convert the water quality dataset into a single number is the most important task of most water quality monitoring programmes. As the water quality index setup is based on different local obstacles, it is not feasible to introduce a definite ...
Aquaculture is an expanding activity worldwide. However its rapid growth can affect the aquatic environment through release of large amounts of chemicals, including antibiotics. Moreover, the presence of organic matter and bacteria of different origin can favor gene transfer and recombination. Whereas ...
ABSTRACT The Ross Worm (Sabellaria spinulosa) can, when found in sufficiently high densities, form a biogenic reef attracts other fauna to the same vicinity. Such reef are now protected as an Annex 1 habitat under the European Union Habitats Directive. As a result, companies proposing to lay infrastructure ...
ABSTRACT The Unmanned, Untethered, Underwater Vehicle MARTIN was launched by Maridan, Denmark in 1995. MARTIN is being instrumented for bathymetry and inspection of offshore installations (pipelines, sea cable). Sea trials are continuing. UUV are expected to become a feasible supplement to ROVs for ...
ABSTRACT This paper discusses some of the problems associated with the design of subsea pipelines for the hydrocarbon industry Concentrating primarily on subsea tiebacks In the North Sea, it looks at those aspects of design which reflect the tensions between operational requirements, installation requirements ...
INTRODUCTION Since the arrival of seamen in the Bight of Benin, continuous survey and sounding of the bars rivers and ports of Nigeria have been carried pt by master mariners, shipping agents, the Royal Navy, oil companies, dredging companies and the Nigerian Ports Authority. The Ports Authority is ...
INTRODUCTION Dangerous cargoes lost in the North Sea must e salvaged before they can cause accidents. Lost cargoes must be found using sonar, and then identified with still and video cameras mounted on a remotely operated vehicle (ROV). Finally, the cargoes must be salvaged or neutralized. The practice ...
The paper reviews current knowledge of intensity and directionality of bat echolocation signals. Recent studies have revealed that echolocating bats can be much louder than previously believed. Bats previously dubbed “whispering” can emit calls with source levels up to 110 dB SPL at 10 cm and the louder ...
Results from two advanced complementary research echosounding systems are examined and discussed The more complex system is a Hydrographic Wide Swath Sweeping Survey Echosounder for shallow and deep water applications (Hydrosweep) for accurate bathymetric surveys and terrain-following navigation The ...
The number of submarine pipelines in the North Sea continues to grow and with it comes the need to monitor and service such systems. In most areas of the North Sea, pipeline inspections are required annually by government inspectorates. These twelve-monthly inspections must be capable of determining, ...