Partial nutrient budgets for semi-intensive shrimp farms in Honduras

Characterisation of water quality in effluents of land-based abalone farms in the Western Cape, South Africa

“…This relative excess of P is further illustrated by the poor recovery of dietary P (13%) relative to N (33%) in abalone harvest. The N accretion value is similar to some of the higher values recorded for finfish (Hargreaves 1998, Wang et al 2012) and semiintensive shrimp culture, even if fertiliser input is included (Teichert-Coddington et al 2000, CasillasHernández et al 2006. Nitrogen recovery in intensive shrimp farms may be less (e.g.…”

“…The discharged TN:TP ratio of 5.1−6.3 is somewhat less than the Redfield ratio of 7.2 by weight. This compares with a range for finfish of 5.4−9.3 for rainbow trout (Koçer et al 2013) and seabass (Lemarié et al 1998), respectively, and 5.5−7.3 for shrimp (Teichert-Coddington et al 2000, Casillas-Hernández et al 2006. The slightly lower TN:TP ratio for abalone than other farmed species suggests greater N retention within these farm systems.…”

Farming system transformation yields significant reduction in nutrient loading: Case study of Hongze Lake, Yangtze River Basin, China

“…TNL and TPL from the mitten crab farming sector in the reclaimed wetlands around Hongze Lake were estimated using the nutrient balance models as had been done previously for many aquatic farming practices Enell, 1990, 1994;Funge-Smith and Briggs, 1998;Teichert-Coddington et al, 2000;Wahaba et al, 2003;Guo et al, 2009;De Silva et al, 2010). As the feed types used in mitten crab farming in the reclaimed wetlands around Hongze Lake were variable (trash fish only; pellet feed + trash fish; pellet feed only), TNL and TPL for different feed types were compared.…”

“…Nutrient balance models have been used to estimate total farm nutrient loading, including total nitrogen loading (TNL) and total phosphorus loading (TPL) in many instances Enell, 1990, 1994;Funge-Smith and Briggs, 1998;Teichert-Coddington et al, 2000;Wahaba et al, 2003;Guo et al, 2009;De Silva et al, 2010).…”

Impact of Shrimp Farm Effluent on Water Quality in Coastal Areas of the World Heritage-Listed Ha Long Bay

“…3a). The concentrations of NO3-N in this study were similar to those found in study of McNevin (2004) Total phosphorus: TP is a critically important factor that needs to be considered in the assessment and monitoring of coastal water quality relating to shrimp farming since it is the source of soluble inorganic phosphorus, the key metabolic nutrient for plant growth (Boyd and Green, 2002;Boyd and Tucker, 1998) and a major part of input phosphorus is not converted to shrimp biomass, but discharged into the surrounding environment (Briggs and Funge-Smith, 1994;FungeSmith and Briggs, 1998;Paez-Osuna et al, 1997;Teichert-Coddington et al, 2000;Xia et al, 2004;Paez-Osuna and Ruiz-Fernandez, 2005). TP concentrations at the ASF location in this study were normally lower than 0.05 mg L −1 .…”