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This paper introduces an acoustic zone surveillance system that only uses a few acoustic receivers to determine a zone used by a tagged fish in narrow water bodies. The new technology was installed 100–270 m apart along the river, with each zone having accurate measurements in the eight stationary transmitters' inner and outermost zones and a single transmitter towed by a boat. By contrast, centre-of-activity localisation estimated positions around the receiver array's center of the receiver array, but hyperbolic localization was unable to provide positions due to a nearly straight-line array of receivers. The technique can be used to cover a wide region with a limited number of receivers at a fine scale, and it can be used to help determine the key habitats and distribution used by target species in the new study sites.
Source link: https://doi.org/10.1007/s10641-022-01225-9
Copper is a key microelement that is essential to aquatic animal growth and wellbeing. Cu is also a cofactor for several enzymes involved in the antioxidation capacity and metalloenzyme formation. Aquafeed formulations should contain sufficient amounts of Cu to provide aquatic animals with the required chemical requirements. However, external Curiosity sources are often sufficient to meet aquatic animals' basic needs. Aquatic animals should also be considered as long as aquatic animals can obtain their essentials by gills to prevent overdosing and toxicity. Several studies have shown that many aquatic animals require Cu in the right doses for optimal growth, productivity, and health. It also helps academia conduct further studies to better understand the boundaries between Cu requirements and toxicity. Besides, more research is required to determine the primary mode of action of Cu in aquatic animals' whole bodies.
Source link: https://doi.org/10.1007/s12011-021-03079-1
The first freshwater species from the US Virgin Islands was identified 190 years ago, but research on inland aquatic animals, particularly invertebrates, remains limited. Natural history books about inland aquatic diversity for the USVI began almost two decades ago than those from elsewhere, due to the Caribbean's turbulent past of European colonization, natural history books about inland aquatic diversity for the USVI began almost two decades earlier than those from elsewhere. Proposed in the first natural history by West in 1793, and bolstered later by Ledru in 1810, an assumption that Puerto Rico and USVI faunas were almost identical. We discuss the pivotal Scientific Survey of Porto Rico and the Virgin Islands, as well as the importance of local and foreign naturalists and taxonomists in our understanding of aquatic biota. Despite widespread use of USVI and Puerto Rican inland aquatic vertebrate faunas, recent St. Thomas research have collected several new records and uncovered aquatic invertebrates.
Source link: https://doi.org/10.1007/s10452-021-09933-7
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