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Registro Completo |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
29/06/2005 |
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Data da última atualização: |
29/06/2005 |
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Autoria: |
NASCIMENTO, I.A.; COSTA, J.B.; SANTANA, C.F.; PEREIRA, S.A.; SILVA, E.M. da; ARAUJO, A.M.S. |
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Título: |
Dinamica de alteracao de parametros ambientais em area estuarina tropical: implicacoes para o cultivo de camaroes em gaiolas. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
In: SIMPOSIO BRASILEIRO DE AQUICULTURA, 11. ENCONTRO SULBRASILEIRO DE AQUICULTURA, 4. ENCONTRO CATARINENSE DE AQUICULTURA, 5. FESTIVAL NACIONAL DA OSTRA E DA CULTURA ACORIANA, 2, 2000, Florianopolis,SC. Anais... Florianopolis: BMLP, 2000. CD-ROM. |
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Idioma: |
Português |
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Conteúdo: |
Long-term viability of aquaculture projects is dependent upon selection of sites which have biological and physical conditions necessary to promote rapid growth and high survival of cultured species. To achieve this goal it is necessary a characterization of the estuarine dynamic in terms of several environmental parameters. This research aimed to establish a data base of the water variations in Barra dos Carvalhos (13 0 39'05"S; 38 o 57'59"W). Circadian determinations of environmental parameters (temperature, salinity, condutivity, pH, turbidity, dissolved oxigen, chlorophyl a and pheopigments) was made at
different seasons (dry and rainy) and different tidal conditions ( spring and neap tides) at 3h intervals in the water, inside and outside the shrimp cages. Characteristically the temperature had a very small range of variation along the seasons (27.1 to 31.1 0 C for the dry season and 23.1 to 28.5 0 C for the rainy season, having average values respectively of 30.6 and 25.58 0 C. The DO varied from a maximum of 5.60mg/L (in the morning) to a minimum of 3.04mg/L (at night) during the dry season. During the rainy season (when occured the lowest temperatures) these values never went below 3.90 or above 6.87mg/L. DO values increased at high tides even at night, due the entrance of sea water into the estuary. Chlorophyl values (maximum 2.88 and minimum 0.34 g/L during the dry season; max.390 and min 0.61 g/L during the rainy season) were related to DO ,meaning that the highest DO values were due to the highest accurence of photosynthesis. The peaks of pheopigments were coincident with periods of low tides, especially at night. Salinity in the surface water, as far as condutivity were highly variable between seasons. During the dry season the salinity in one tide cycle varied from 21.0 to25.0 ppt (neap tide) and 29.0 to 33.10 (spring tide). Salinity was affected by rainfall when a decrease from 29.8 ppt to 8.9 ppt was found during neap tides. The turbidity values were high during the rainy season reaching 30 UNT. The oscilation of the turbidity values were always related to the tide flow. Rain and wave action appears to be the main agents in controlling turbidity. A multivariate analysis of all parameters data showed this
area as being shallow, well mixed, and tide dependent. All the parameters had a range compatible to shrimp (Penaeid) cultivation. MenosLong-term viability of aquaculture projects is dependent upon selection of sites which have biological and physical conditions necessary to promote rapid growth and high survival of cultured species. To achieve this goal it is necessary a characterization of the estuarine dynamic in terms of several environmental parameters. This research aimed to establish a data base of the water variations in Barra dos Carvalhos (13 0 39'05"S; 38 o 57'59"W). Circadian determinations of environmental parameters (temperature, salinity, condutivity, pH, turbidity, dissolved oxigen, chlorophyl a and pheopigments) was made at
different seasons (dry and rainy) and different tidal conditions ( spring and neap tides) at 3h intervals in the water, inside and outside the shrimp cages. Characteristically the temperature had a very small range of variation along the seasons (27.1 to 31.1 0 C for the dry season and 23.1 to 28.5 0 C for the rainy season, having average values respectively of 30.6 and 25.58 0 C. The DO varied from a maximum of 5.60mg/L (in the morning) to a minimum of 3.04mg/L (at night) during the dry season. During the rainy season (when occured the lowest temperatures) these values never went below 3.90 or above 6.87mg/L. DO values increased at high tides even at night, due the entrance of sea water into the estuary. Chlorophyl values (maximum 2.88 and minimum 0.34 g/L during the dry season; max.390 and min 0.61 g/L during the rainy season) were related to DO ,meaning that the high... Mostrar Tudo |
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Palavras-Chave: |
Camarao; Criacao; Gaiola. |
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Categoria do assunto: |
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Marc: |
LEADER 03211naa a2200217 a 4500
001 1037054
005 2005-06-29
008 2000 bl uuuu u00u1 u #d
100 1 $aNASCIMENTO, I.A.
245 $aDinamica de alteracao de parametros ambientais em area estuarina tropical$bimplicacoes para o cultivo de camaroes em gaiolas.
260 $c2000
520 $aLong-term viability of aquaculture projects is dependent upon selection of sites which have biological and physical conditions necessary to promote rapid growth and high survival of cultured species. To achieve this goal it is necessary a characterization of the estuarine dynamic in terms of several environmental parameters. This research aimed to establish a data base of the water variations in Barra dos Carvalhos (13 0 39'05"S; 38 o 57'59"W). Circadian determinations of environmental parameters (temperature, salinity, condutivity, pH, turbidity, dissolved oxigen, chlorophyl a and pheopigments) was made at different seasons (dry and rainy) and different tidal conditions ( spring and neap tides) at 3h intervals in the water, inside and outside the shrimp cages. Characteristically the temperature had a very small range of variation along the seasons (27.1 to 31.1 0 C for the dry season and 23.1 to 28.5 0 C for the rainy season, having average values respectively of 30.6 and 25.58 0 C. The DO varied from a maximum of 5.60mg/L (in the morning) to a minimum of 3.04mg/L (at night) during the dry season. During the rainy season (when occured the lowest temperatures) these values never went below 3.90 or above 6.87mg/L. DO values increased at high tides even at night, due the entrance of sea water into the estuary. Chlorophyl values (maximum 2.88 and minimum 0.34 g/L during the dry season; max.390 and min 0.61 g/L during the rainy season) were related to DO ,meaning that the highest DO values were due to the highest accurence of photosynthesis. The peaks of pheopigments were coincident with periods of low tides, especially at night. Salinity in the surface water, as far as condutivity were highly variable between seasons. During the dry season the salinity in one tide cycle varied from 21.0 to25.0 ppt (neap tide) and 29.0 to 33.10 (spring tide). Salinity was affected by rainfall when a decrease from 29.8 ppt to 8.9 ppt was found during neap tides. The turbidity values were high during the rainy season reaching 30 UNT. The oscilation of the turbidity values were always related to the tide flow. Rain and wave action appears to be the main agents in controlling turbidity. A multivariate analysis of all parameters data showed this area as being shallow, well mixed, and tide dependent. All the parameters had a range compatible to shrimp (Penaeid) cultivation.
653 $aCamarao
653 $aCriacao
653 $aGaiola
700 1 $aCOSTA, J.B.
700 1 $aSANTANA, C.F.
700 1 $aPEREIRA, S.A.
700 1 $aSILVA, E.M. da
700 1 $aARAUJO, A.M.S.
773 $tIn: SIMPOSIO BRASILEIRO DE AQUICULTURA, 11. ENCONTRO SULBRASILEIRO DE AQUICULTURA, 4. ENCONTRO CATARINENSE DE AQUICULTURA, 5. FESTIVAL NACIONAL DA OSTRA E DA CULTURA ACORIANA, 2, 2000, Florianopolis,SC. Anais... Florianopolis: BMLP, 2000. CD-ROM.
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