—We analyzed data on spring and summertime larval and juvenile fish distribution and abundance in the upper San Francisco Estuary (SFE), California between 1995 and 2001. The upper SFE includes the tidal freshwater areas of the Sacramento–San Joaquin Delta downstream to the euryhaline environment of San Pablo Bay. The sampling period included years with a variety of outflow conditions. Fifty ta...

Pumping at the water export facilities in the southern Sacramento-San Joaquin Delta kills fish at and near the associated fish-salvage facilities. Correlative analyses of salvage counts with population indices have failed to provide quantitative estimates of the magnitude of this mortality. I estimated the proportional losses of Sacramento River Chinook salmon (Oncorhynchus tshawytscha) and del...

Rainbow smelt (Osmerus mordax) have invaded many North American lakes, often resulting in the extirpation of native fish populations. Yet, their invasion is incipient and provides the rationale for identifying ecosystems likely to be invaded and where management and prevention efforts should be focused. To predict smelt presence and absence, we constructed a classification-tree model based on h...

—The San Francisco Estuary supports several endemic species of fish and the southernmost populations of other species. Many of these native species and populations are imperiled or have experienced recent population declines that indicate a general decline in the estuary’s capacity to support pelagic fish species. We studied the distribution and abundance of one of the estuary’s native species,...

Future development and climate change pose potentially serious threats to estuarine fish populations around the world. We examined how habitat suitability for delta smelt (Hypomesus transpacificus), a state and federally protected species, might be affected by changes in outflow in the San Francisco Estuary due to future development and climate change. Forty years of sampling data collected dur...

Rainbow smelt (Osmerus mordax) inhabit inshore waters along the North American Atlantic coast. During the winter, these waters are frequently ice covered and can reach temperatures as low as -1.9 degrees C. To prevent freezing, smelt accumulate high levels of glycerol, which lower the freezing point via colligative means, and antifreeze proteins (AFP). The up-regulation of the antifreeze respon...

The San Francisco Estuary is home to an important endangered fish called delta smelt. Delta smelt eat small, nutritious animals zooplankton survive and grow. In turn, grow by eating microscopic plant-like organisms phytoplankton. the past, was full of plankton Because people have removed water from invasive species now live there, no longer has enough feed smelt, making it difficult for them su...

The delta smelt (Hypomesus transpacificus) is a small and relatively obscure fish that has recently risen to become a major focus of environmental concern in California. It was formally abundant in the low-salinity and freshwater habitats of the northeastern San Francisco Estuary, but is now listed as threatened under the Federal and California State Endangered Species Acts. In the decade follo...

Gümüş balığı (Atherina boyeri Risso, 1810), doğal olarak denizler ve lagün bölgelerinde yayılış gösteren örihalin bir türdür. Bu tür, balıkçılık amacıyla, resmȋ kuruluşların bilgisi olmadan göllere yapay göletlere de taşınmış Türkiye’de, deniz ile doğrudan bağlantısı bulunmayan pek çok göl rezervuarda son yıllarda hızla yayılmıştır. çalışmada, Bafa Gölü’nde, Eylül 2018 Mayıs 2019’da yapılan örn...