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| Registros recuperados: 87 | |
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| Leonarduzzi, E.. |
| Age and growth rates of southern anchovy larvae (Engraulis anchoita)were estimated by analysis of daily increments in sagittal otoliths under light microscopy. Samples were collected during 2002 with a bongo net, in the Buenos Aires province, Argentine Sea (SW Atlantic). Otoliths corresponding to 251 larvae (size range 3.5 u 12.2 mm SL)were analyzed. Growth rate estimated as slopes by linear regression of length-age data were 0.50, 0.40, and 0.42 mm/day, and these values corresponded to larvae collected in spring, summer and autumn. Larval growth were significantly distinct between the year seasons (ANCOVA, p<0.01). Recent larval growth expressed as mean growth rates during the last 4 days of the larvae was not correlated with surface temperature. The... |
| Tipo: Theses and Dissertations |
Palavras-chave: Fish larvae; Growth; Otoliths; Seasonal variations; Daily variation; Growth; Otoliths; Fish larvae. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/1484 |
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| Maguer, Jf; Lecorre, P; Madec, C. |
| Seasonal changes in inorganic (NH4+; NO3-; NO2-) and organic (urea) nitrogen uptake were studied with N-15 as a tracer at a shallow station (depth: 22 m) in permanently well-mixed waters of the Western English Channel. Uptake of all the four nutrients was maximum in spring. Nitrate uptake accounted for a third of the total during spring phytoplankton growth, but decrease in summer. This decrease was related to the low ambient nitrate concentrations in early summer and to an inhibition of uptake by high concentrations in late summer. Ammonium was taken up in significant amounts from the beginning of spring (46 % of total uptake), increasing to 59 % in summer. In contrast with nitrate, ammonium concentrations during summer were sufficiently high to saturate... |
| Tipo: Text |
Palavras-chave: Nitrogen; Uptake; Seasonal variations; Western English Channel. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00096/20723/18360.pdf |
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| Konan-Brou, Amoin Annabelle. |
| Cet article présente les résultats d'une étude comparative des caractéristiques physico-chimiques (température, turbidité, salinité, pH, concentration en O2 dissous, en phosphates, nitrates, nitrites, ammoniaque)au sein d'une structure d'aquaculture extensive (acadja-enclos)ou habitat artificiel pour poissons et dans l'eau libre environnante. Les caractéristiques du périphyton se développant sur les bambous de l'acadja-enclos sont décrites. L'acadja-enclos est implanté dans le site d'Adiopoté en milieu lagunaire peu profond (1.5 à 2m) et sous influence marine. L'étude a été conduite de novembre 1988 à décembre 1989. La température (25 à 31°C), les concentrations en oxygène dissous (3.8 à 7.2mgl-1); la salinité (1 à 27%0) et le pH (6.7 à 8.6) ont les mêmes... |
| Tipo: Journal Contribution |
Palavras-chave: Seasonal variations; Environmental factors. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/5729 |
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| Registros recuperados: 87 | |
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