The present study is intended to evaluate the potential of an estuarine area surrounded by mangrove at Todos os Santos Bay (Bahia State , Brazil), for supporting aquaculture activities. From October 1977 to July 1978 samples were collected monthly on alternate tides for determination of particulate organic carbon and total proteins The following environmental parameters were also considered: salinity. temperature, pH, transparence, dissolved oxygen, silicates, ammonia, nitrites, nitrates, phosphates and precipitation. Although the area presented low ceil density and low photossinthetic activity, high values for the standing crop were found, demonstrating the importance of detritic material for the particulate organic matter.

The primary production by C14, standing crop as ratio of particulate carbon/nitrogen and biossay tests concerning to dissolved nitrogen and phosphorus were investigated in the SW estuahne mangrove area of the Bay of Todos os Santos (Brazil) during 10 months. The phytoplankton displaied in this area a mean density of 9x10(5) cells/liter. The primary productivity showed an average range of 9.52 to 10.93 mgC/m³/h, representing the rate about 45 g C/m³ /year or 181 g C/m² /year. Phytoplankton fraction under 35µ at the stations 0 and 1 was responsible for the most C14 uptake. A negative relationship between primary production and limiting nitrogen and phosphorus was verified. February samples exhibited the most drastic situation regarding to N and P, as limiting factors; an opposite situation corresponded Jo June and July. The relationship between particulated carbon and nitrogen showed a concentration area among the ranges of400/1400 mgC/m³/ and 4/28 mgN/m³, The ratios C/N revealed the most of times a short variation.

Foi desenvolvido um método para análise do ferro acumulado em células de fitoplâncton, usando ferrocianeto de potássio como agente complexante. Com esse objetivo montaram-se duas experiências: uma em que se mostra o acúmulo de ferro em relação à idade das células e uma segunda experiência onde a assimilação é plotada em função da concentração de EDTA no meio de cultura.

A colorimetric method for the assessment of iron accumulated in the cells of phytoplankton utilizing potassium ferrocyanide was developed. Two experiences with Phaeodactylum tricornutum and Chlorella sp. were carried out: the first one, on uptake of the iron relatively to the age of the culture: the second one, on the iron uptake by the cells, relatively to different concentrations of the chelator EDTA.