Effects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwater
Juvenile freshwater dourados (Salminus brasiliensis Cuvier) were stocked in two batches of different size (61 and 133 individuals) with a time lag of 41 days in the headwaters of the Sinos River. A subsample of 25 fish was radio-tagged. Released juveniles displayed a density dependent dispersal patt...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ictiologia
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| Series: | Neotropical Ichthyology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000200016&lng=en&tlng=en |
| _version_ | 1819240740808556544 |
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| author | Uwe Horst Schulz Mateus Evangelista Leal |
| author_facet | Uwe Horst Schulz Mateus Evangelista Leal |
| author_sort | Uwe Horst Schulz |
| collection | DOAJ |
| description | Juvenile freshwater dourados (Salminus brasiliensis Cuvier) were stocked in two batches of different size (61 and 133 individuals) with a time lag of 41 days in the headwaters of the Sinos River. A subsample of 25 fish was radio-tagged. Released juveniles displayed a density dependent dispersal pattern. During the first ten days mean covered distance of tagged batch 1 individuals (low density) was approximately 24 m d-1, while batch 2 individuals (high density) moved 296 m d-1. Activity of batch 1 fish increased after the release of batch 2 and remained high (459 m d-1) until 90 days. Activity of batch 2 fish during this period was in same range. After this period, activity levels of both batches decreased to about 60 m d-1. Increased movements in higher density condition are seen as a result of interspecific competition. The mean covered distances per day remained high until stocked individuals become established in their new habitat. |
| first_indexed | 2024-12-23T14:12:49Z |
| format | Article |
| id | doaj.art-5ea95dbadb044e8bb94e7e07cabb1bfc |
| institution | Directory Open Access Journal |
| issn | 1982-0224 |
| language | English |
| last_indexed | 2024-12-23T14:12:49Z |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj.art-5ea95dbadb044e8bb94e7e07cabb1bfc2022-12-21T17:43:59ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-022410240941510.1590/S1679-62252012005000001S1679-62252012000200016Effects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwaterUwe Horst Schulz0Mateus Evangelista Leal1Universidade do Vale do Rio dos SinosUniversidade do Vale do Rio dos SinosJuvenile freshwater dourados (Salminus brasiliensis Cuvier) were stocked in two batches of different size (61 and 133 individuals) with a time lag of 41 days in the headwaters of the Sinos River. A subsample of 25 fish was radio-tagged. Released juveniles displayed a density dependent dispersal pattern. During the first ten days mean covered distance of tagged batch 1 individuals (low density) was approximately 24 m d-1, while batch 2 individuals (high density) moved 296 m d-1. Activity of batch 1 fish increased after the release of batch 2 and remained high (459 m d-1) until 90 days. Activity of batch 2 fish during this period was in same range. After this period, activity levels of both batches decreased to about 60 m d-1. Increased movements in higher density condition are seen as a result of interspecific competition. The mean covered distances per day remained high until stocked individuals become established in their new habitat.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000200016&lng=en&tlng=enDensity dependenceDispersalIntraspecific competitionMovements |
| spellingShingle | Uwe Horst Schulz Mateus Evangelista Leal Effects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwater Neotropical Ichthyology Density dependence Dispersal Intraspecific competition Movements |
| title | Effects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwater |
| title_full | Effects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwater |
| title_fullStr | Effects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwater |
| title_full_unstemmed | Effects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwater |
| title_short | Effects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwater |
| title_sort | effects of stocking density on dispersal behavior of brazilian freshwater dourado salminus brasiliensis in a subtropical river headwater |
| topic | Density dependence Dispersal Intraspecific competition Movements |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000200016&lng=en&tlng=en |
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