منابع مشابه
Lower Mohawk River Fisheries
Overview The 257 km Mohawk River is the second longest river in New York State with the lower 47 km located within the Capital District (Albany-Schenectady-Troy) area, the state’s fourth largest metropolitan area. The river is also part of the New York State Barge Canal system. The magnitude of the resource, its close proximity to large numbers of people, and environmental assessment needs rela...
متن کاملThe Plata River Basin: International Basin Development and Riverine Fisheries
Environmental changes in large river basins are subject to forces external to the water and to biological issues. Before 1960, the Plata River Basin was almost undeveloped. The regulation of the Parana for hydroelectricity has been increasing since the early 1970s. Water in reservoirs of the upper Parana Basin currently comprises more than 70 percent of the mean annual discharge at its confluen...
متن کاملtechnical and legal parameters for determination of river boundary,( case study haraz river)
چکیده با توسعه شهر نشینی و دخل و تصرف غیر مجاز در حریم رودخانه ها خسارات زیادی به رودخانه و محیط زیست اطراف آن وارده می شود. در حال حاضر بر اساس آئین نامه اصلاح شده بستر و حریم رودخانه ها، حریم کمی رودخانه که بلافاصله پس از بستر قرار می گیرد از 1 تا20 متر از منتهی الیه طرفین بستر رودخانه تعیین، که مقدار دقیق آن در هر بازه از رودخانه مشخص نیست. در کشورهای دیگر روشهای متفاوتی من جمله: درصد ریسک...
15 صفحه اولCompositional trends of fisheries in the River Ganges, India
Monthly surveys of local fisheries from five principal landing sites on the River Ganges at Bhagalpur, India, were conducted from 2001 to 2007. Fishes of a range of sizes with mostly periodic-type life-history strategies, including many catfishes and carps, dominated the catch. Average annual yield (total mean monthly catch in units of biomass) was highly variable but trended downward during th...
متن کاملArtisanal fisheries of the Xingu River basin in Brazilian Amazon.
The present study characterises the commercial fisheries of the basin of the Xingu River, a major tributary of the Amazon River, between the towns of Gurupá (at the mouth of the Amazon) and São Félix do Xingu. Between April, 2012, and March, 2014, a total of 23,939 fishing trips were recorded, yielding a total production of 1,484 tons of fish, harvested by almost three thousand fishers. The ana...
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ژورنال
عنوان ژورنال: NIPPON SUISAN GAKKAISHI
سال: 2007
ISSN: 0021-5392,1349-998X
DOI: 10.2331/suisan.73.78