Abstract Using critical thermal maximum (CTMax) tests, we examined the relationship between upper temperature tolerances and fish size (fry–adult or subadult lengths) of rainbow trout Oncorhynchus mykiss (41–200‐mm TL), Apache O. gilae apache (40–220‐mm largemouth bass Micropterus salmoides (72–266‐mm Nile tilapia Oreochromis niloticus (35–206‐mm channel catfish Ictalurus punctatus (62–264 mm‐TL), Rio Grande cutthroat clarkii virginalis (36–181‐mm TL). Rainbow were acclimated at 18°C, 14°C,...

We prospectively studied 47 sarcoidosis suspects and compared conjunctival transbronchial lung biopsies in these patients. Thirty-four patients had positive findings on biopsy by either method. The was 31 patients, the 19. more likely to be black (p = 0.009) with pulmonary infiltrates chest x ray 0.0044). In comparison, follicles 0.036), ocular abnormalities consistent 0.02), 0.029). Iritis present 12 enlarged lacrimal glands three, vitritis five. conclude that is an effective means of...

We developed a predation index to describe the relative magnitude of on juvenile salmonids by northern squawfish Ptychocheilus oregonensis throughout lower and middle Columbia River Snake River. The was product an abundance consumption index. evaluated various catch indices found that per unit effort best reflected differences among abundances. Northern higher in than or rivers highest Bonneville Reservoir downstream from Dam. based concept meal turnover time for sample squawfish. Variables...

ABSTRACT The Pacific lamprey ( Entosphenus tridentatus ) is in decline the Columbia River Basin, and translocating adult to bypass difficult migration corridors has been implemented since 2000. We describe report results from two current translocation programs, provide context for use of translocation, discuss potential benefits, risks, uncertainties. Both programs appear have increased number spawning adults presence larvae juveniles; however, any subsequent increase naturally will require...

Abstract We quantified tag retention, survival, and growth in juvenile, captive‐reared Humpback Chub Gila cypha marked with three different types: (1) Biomark 12.5‐mm, 134.2‐kHz, full duplex PIT tags injected into the body cavity a 12‐gauge needle; (2) 8.4‐mm, 16‐gauge (3) Northwest Marine Technology visible implant elastomer (VIE) under skin 29‐gauge needle. Estimates of loss, tagging‐induced mortality, were evaluated for 60 d each type four size‐groups fish: 40–49 mm, 50–59 60–69 70–79 mm...

Plus de 900 000 sauvagesses du nord (Ptychocheilus oregonensis) ont ete prelevees dans le Columbia et la riviere Snake, entre 1990 1995, par peche sportive avec primes dirigee, l'espoir d'accroitre production saumons truite arc-en-ciel anadrome (Oncorhynchus spp.). Notre etude indique qu'un faible prelevement peut avoir des effets positifs, hors proportion, sur survie si ce ne suscite pas une reaction compensation parmi les populations predatrices. On prevoir augmentation nombre salmonides...

We examined the relationship between species richness of arthropod fauna in temporary Negev desert pools and key environmental variables. Treating these as habitat islands, we found that three five predictions island biogeography theory were upheld. However, crucial claim there is turnover while remains constant was not supported. Although turnover, increased steadily throughout study. The slope v. pool area regression decreased with time coefficient determination for this increased....

Abstract The abundance of the Little Colorado River population federally listed humpback chub Gila cypha in Grand Canyon has been monitored since late 1980s by means catch rate indices and capture–recapture‐based estimators. Analyses data from all sources using various methods are consistent indicate that adult declined monitoring began. Intensive tagging led to a high proportion (>80%) being marked mid‐1990s. Analysis these both closed open estimation models yields results agree with...

Abstract We investigated electrofishing catchability ( q ) for brown trout Salmo trutta and rainbow Oncorhynchus mykiss in the Colorado River, Grand Canyon National Park, Arizona, over a range of fish densities, water temperatures, turbidities, conductivities, shoreline types, seasons. The covariance with density strongly resembled random distributions, thereby suggesting no relationship between density. was greater turbid (≥480 nephelometric turbidity units (NTU)) than clear (≤10 NTU),...

A "Meeting on Upstream Rotavirus Vaccines and Emerging Vaccine Producers" was held at the World Health Organization in Geneva, Switzerland March 28-30, 2006. The purpose to discuss, evaluate, weigh importance of additional rotavirus vaccine candidates following successful international licensure vaccines by two major pharmaceutical companies (GlaxoSmithKline Merck) that had been development for many years. Both licensed are composed live rotaviruses delivered orally as have all candidate...

Understanding trends in the diverse resources provided by large rivers will help balance tradeoffs among stakeholders and inform strategies to mitigate effects of landscape scale stressors such as climate change invasive species. Absent a cohesive coordinated effort assess important river resources, logical starting point is our ability draw inferences from existing efforts. In this paper, we use common analytical framework analyze data five disparate fish monitoring programs better...

Abstract Predation on juvenile native fish by introduced rainbow trout Oncorhynchus mykiss and brown Salmo trutta is considered a significant threat to the persistence of endangered humpback chub Gila cypha in Colorado River Grand Canyon. Diet studies Glen canyons indicate that these species eat fish, but impacts are difficult assess because predation vulnerability highly variable depending physical conditions under which interactions take place. We conducted laboratory experiments evaluate...

Predation by large northern pikeminnow (formerly squawfish) Ptychocheilus oregonensis is a major source of mortality for juvenile salmonids Oncorhynchus spp. in the lower Columbia and Snake rivers. Large-scale, agency-operated fisheries have been implemented this area since 1990 to harvest with goal 10–20% exploitation. We used indirect methods analyze success fisheries, examined benefits salmonid populations. From 1991 1996, three (sport-reward, dam-angling, gill-net) harvested...

A bioenergetics model was developed and corroborated for northern pikeminnow Ptychocheilus oregonensis, an important predator on juvenile salmonids in the Pacific Northwest. Predictions of modeled predation rate were compared with field data from three areas John Day Reservoir (Columbia River). To make estimates rate, methods used to approximate change mass average predators during 30-d growth periods: Observed between first second month, predicted calculated seasonal rates, based annual...

We estimated relative abundance of northern pikeminnow Ptychocheilus oregonensis and consumption juvenile salmonids Oncorhynchus spp. by at standardized sites in the lower Columbia Snake rivers from 1994 to 1996. Indexes were compared with indexes measured 1990 1993 evaluate changes predation concurrent a predator control program basin. Reductions abundance, consumption, or both resulted mean 1994–1996 index values that 44–91% than 1990–1993 throughout Consumption surviving has not increased...

We described and compared population structure, growth, mortality, reproduction of northern Squawfish Ptychocheilus oregonensis among four reservoirs the lower Columbia River Snake River. also pooled data for comparisons three larger areas: reservoirs, unimpounded downstream from Bonneville Dam. Females made up 76–100% squawfish 380 mm fork length or greater in individual 87–99% fish combined areas. lived longer grew faster than males all areas had annual mortality rates but two reservoirs....

The flannelmouth sucker Catostomus latipinnis is one of the few native fish that persists in lower Colorado River basin. Little known about effects hypolimnetic releases cold, swift water from dams on populations. We conducted fatigue velocity tests age-0 suckers laboratory to evaluate temperature and size swimming ability. Fish 25-114 mm total length (TL) were subjected incremental increases until upper limit their ability was reached. Swimming at 10, 14, 20°C. increased with directly...

We conducted laboratory tests to evaluate the effects of an abrupt 10°C decrease in water temperature on ability age-0 flannelmouth suckers (Catostomus latipinnis) escape predation by rainbow trout (Oncorhynchus mykiss). Juvenile (58 mm mean total length) were maintained at 20°C and introduced individually, without acclimation, into tanks containing a single adult (246 10 or 20°C. Rainbow attacked more often 20°C, but likely capture them 10°C. Age-0 flan-nelmouth experience when they exit...