نتایج جستجو برای: pisces
تعداد نتایج: 2111 فیلتر نتایج به سال:
We construct a global sensitivity analysis framework for coupled multiphysics model used to predict the changes in material properties and surface morphology of helium plasma-facing components future fusion reactors. The combines particle dynamics simulator F-TRIDYN, that predicts implantation profile, with cluster Xolotl, growth evolution subsurface gas bubbles. In order keep tractable, we fir...
The cichlid Hypsophrys nicaraguensis is a popular fish known as butterfly, and despite its widespread use as pets, little is known about its reproductive biology. In order to contribute to this knowledge, the study describes the relevant larval development characteristics, from adult and larval cultures in captivity. Every 12h, samples of larvae were collected and observed under the microscope ...
Contents INTROD UCTI ON 1 Backgro und 1 Analy tical and historical notes 1 2 LOCATION 3 Proposed delineation ofocean and estuarine areas 3 Proposed level of p rotection in estuarine and non-estuarine waters 4 The effects ofintakes within and outside the littoral zone 5 3 FLO\V AN D VO LUM E 7 Effects of volume p ump ed on fi sh impi ngement and entrainment 7 The choice of2 to 30 million gallons...
Three new species of Trimma are described from various localities in Indonesia. All three can be readily identified from their live, freshly collected, or preserved colouration. Trimma meranyx n. sp. is further distinguished from other species by the possession of 8-9 scales in the predorsal midline, up to three rows of (usually) cycloid scales on the opercle, two scales at the posterodorsal bo...
Van, Richard P. Systematics of the Neotropical Characiform Genus Steindachnerina Fowler (Pisces: Ostariophysi). Smithsonian Contributions to Zoology, number 507, 118 pages, 80 figures, 10 tables, 1991.—The genus Steindachnerina Fowler (1906) of the characiform family Curimatidae is defined as a monophyletic unit. Shared derived features of the gill arches and possibly in dorsal-fin pigmentation...
Cytogenetic studies were carried out on Rhamdella microcephala collected from the headwaters of the Machado river, a tributary of the Sapucaí river, Minas Gerais, Brazil. Sixteen specimens exhibited 2n556 chromosomes, with 18 metacentrics, 30 submetacentrics and 8 subtelocentric-acrocentrics (FN584). The nucleolar organizing regions (NORs) were identified in the interstitial position on the lon...
We investigate the variation of current star formation in galaxies as a function of distance along three supercluster filaments, each joining pairs of rich clusters, in the Pisces-Cetus supercluster, which is part of the two-degree Field Galaxy Redshift Survey (2dFGRS). We find that even though there is a steady decline in the rate of star formation, as well as in the fraction of star forming g...
All-female species of Poeciliopsis depend upon ~ ~ of closely related species for sperm. This relationship creates a competitive situation in which bisexual ~ ~ compete with unisexual ~ ~ for sperm from ~ ~ of the bisexual species. Earlier studies demonstrated a sufficient mechanism inherent in the behavior of ~ ~ for allowing coexistence in mixed unisexualbisexual populations. Courtship prefer...
A rapid PCR-RFLP analysis was optimized to identify the presence of 3 closely related gadoid fish species: Alaska pollack Theragra chalcogramma, Pacific cod Gadus macrocephalus and Atlantic cod Gadus morhua in commercial seafood products. Gadoid universal primers were designed for PCR amplification of a 558-bp fragment encoding the mitochondrial cytochrome b gene. Without purification of the PC...
We studied gill parasites of Prochilodus lineatus in the San Javier River, which is connected to the Middle Paraná System (Santa Fe, Argentina). In 25 specimens, the parasite prevalence in branchial organs was 92% and the average intensity was 8.3 parasites/infested fish. The parasite community showed no dominance of any taxon, but the family Dactylogyridae represented 60% of the community. We ...
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