Ecology of large piscivorous fishes in Guri Reservoir, Venezuela, with notes on fish community structure /
a detritivorous characiform, was the dominant species
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | a detritivorous characiform, was the dominant species and fishing pressure all influence fish ecology in Guri Blackwater physicochemistry, the reservoir "boombust" cycle, captured in gillnets. Cichla spp. appear to breed throughout Cichla cf orinocensis, Plagioscion squamosissimus and compare current fish community structure with a previous Conversely, catch per unit effort for Cichla in gillnets currently has the second largest hydroelectric facility in decreased in the current study. Prochilodus rubrotaeniatus, exhibited heightened fish production immediately after feeding, and survival. The primary sportfishes in the for all species were low. Claims of declining Cichla growing need for electricity which has largely been met with Guri began complaining about decreased catches. To Hemigrammus micropterus. In these samples, Cichla temensis, hydroelectric power, and yet the full effects of river Hydrolycus scomberoides had greater body condition compared impoundment on river ecosystems are not known. Venezuela inundation. However, during the 1990's, sportfishermen at investigate claims of declining Cichla populations and to level fluctuations associated with hydroelectric facility low nutrients, and high dissolved organic matter. Water operations may have large effects on tropical fish spawning, Plagioscion squamosissimus had high diet overlap among prey populations in Guri appear to have some foundation. reservoir are the peacock basses (Cichla spp.), that reservoir had 50 species representing 18 different families. Reservoir. resources, with the former consuming the largest prey and the scomberoides and Plagioscion squamosissimus partitioned smallest prey consumed by the latter. Cichla temensis and survey, the four large piscivorous fishes of Guri Reservoir the blackwater Caroni River, Guri is characterized by low pH, The dominant species in seine samples was the characid the world, the Raul Leoni Dam (Guri Reservoir). Formed by the year with a peak before the rainy season. Hydrolycus types but consumed prey of different sizes. Niche breadths Venezuela's growing human population is accompanied by a were sampled. Samples from the northern area of the with values for conspecifics from a previous study. |
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| Item Description: | "Major subject: Wildlife and Fisheries Sciences". Vita. |
| Physical Description: | x, 77 leaves : illustrations, maps ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |