نتایج جستجو برای: fish distribution
تعداد نتایج: 706269 فیلتر نتایج به سال:
BACKGROUND Previous studies have reported the effects of statistics of luminance distribution on visual freshness perception using pictures which included the degradation process of food samples. However, these studies did not examine the effect of individual differences between the same kinds of food. Here we elucidate whether luminance distribution would continue to have a significant effect ...
Universal scaling in the power-law size distribution of pelagic fish schools is established. The power-law exponent of size distributions is extracted through the data collapse. The distribution depends on the school size only through the ratio of the size to the expected size of the schools an arbitrary individual engages in. This expected size is linear in the ratio of the spatial population ...
A growing interest is devoted to global-scale approaches in ecology and evolution that examine patterns and determinants of species diversity and the threats resulting from global change. These analyses obviously require global datasets of species distribution. Freshwater systems house a disproportionately high fraction of the global fish diversity considering the small proportion of the earth'...
Sea lice, especially Lepeophtheirus salmonis and Caligus spp., have the greatest economic impact of any parasite in salmonid fish farming and are also a threat to wild salmonids. Here, I review how the biology and ecology of various louse and host species influence their pathogenicity and epidemiology. Recent discoveries of new species and genotypes emphasize the need for more basic research on...
We have previously reported the development of an extensive invasive growth of the thyroid gland of the gynogenetic teleost, Poecilia formosa (the Amazon molly), following i.p. injection of UV- or gamma-irradiated thyroid cells. This result was surprising by comparison with mammalian work, in which the thyroid is rarely the site for tumor metastases, but the anatomy of the circulation of fish i...
We investigated the spatial and temporal relationship of catch rates and angler party location for two days following a publicly announced put-and-take stocking of rainbow trout (Oncorhynchus mykiss). Catch rates declined with time since stocking and distance from stocking. We hypothesized that opportunity for high catch rates would cause anglers to fish near the stocking location and disperse ...
This study evaluated the ectoparasite distribution on the gill archs of pond-reared pacu (Piaractus mesopotamicus Holmberg, 1887), hybrid patinga (P. mesopotamicus female x P. brachypomus (Cuvier, 1817) male), hybrid tambacu (Colossoma macropomum (Cuvier, 1816) female x P. mesopotamicus male) and hybrid surubim (Pseudoplatystoma reticulatum female x P. corruscans Spix & Agassiz, 1829 male). A t...
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