The pnmary production by Ci4 , standing crop as ratio of particulate carbon/nitrogen and biossay tests c(Jncerning to dissolved nitrogen and phosphorus were investigated in the SW estuarine J7langrove area of the Bay of Todos os Santos (Brazil) during 10 months. The phyto• plankton displaied in this area a mean densit)! of 9x 1 OJ cells lliter. The primary productivity show,ed an aver.age rang~ 0[y.52 to 10.93 mgC / 1m 3 Ih, representing the rate about 45 g C Im] Iyear or 18 1 g C 1m 2 /year. Phy toplankton fraction under 35J1 at the stations O and 1 was responsible for the most C14 uptake. A nega tive relationship between primary production and limiting nitrogen and phosphorus was verified. Fe• bruary samples exhibited the 'V0st drastic situation regarding to N and P, as limiting factors ; an opposite sitl!.tyi271.ss>~SEQ'1!kdJ.o June and Ju1x., The relationship between particulated carbon and nitrogen showed a concentration area among the ranges of 400/ 1400 mgC/m3 / and 4128 mg lV 1m 3 , The rarios CIN revealed the most of times a shorr variation.
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
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