|Ward, George - UNIV TEXAS AUSTIN|
Submitted to: Aquaculture America Conference
Publication Type: Abstract Only
Publication Acceptance Date: January 28, 2002
Publication Date: January 28, 2002
Citation: GREEN, B.W., WARD, G.H. BIOCHEMICAL OXYGEN DEMAND OF SEMI-INTENSIVELY MANAGED SHRIMP PONDS. AQUACULTURE AMERICA CONFERENCE. 2002. Technical Abstract: The objective of this research was to characterize BOD and BOD fractions of water from estuaries that supply shrimp farms, shrimp farm supply canals and production ponds during the dry and rainy seasons in Honduras. Water samples were collected from three to five production ponds each during the rainy and dry seasons on three to five shrimp farms in Honduras. Ponds were at least 70 days into the production cycle. Water samples also were collected from each farm supply canal in the vicinity of the production ponds sampled, and at three locations each along the El Pedregal and San Bernardo estuaries. BOD samples were incubated at 20 C for 30-31 d, and dissolved oxygen measurements were made at intervals of several days. Ultimate carbonaceous and nitrogenous BODs were calculated for each sample using least-squares analysis. Mean carbonaceous ultimate BOD (CBODu) in shrimp farm supply canals ranged from 5.1-8.6 mg/L and 10.8-27.4 mg/L for the dry and rainy seasons samples, respectively. In production ponds, mean CBODu for the dry and rainy season samples, respectively, ranged from 10.7-25.3 mg/L and 18.5-51.6 mg/L. Nitrogenous BOD was detected after 16.5-23.5 d and 18.0-21.5 d in farm supply canal water during the dry and rainy seasons, respectively. Mean nitrogenous ultimate BOD (NBODu) ranged from 1.0-3.2 mg/L in the dry season samples, but was undetected in rainy season samples. In the El Pedregal estuary CBODu ranged from 19.9-27.9 mg/L and 16.0-25.6 mg/L for the dry and rainy season samples, respectively. Corresponding CBODu values for the San Bernardo estuary were 6.2-8.6 and 9.0-16.3 mg/L, respectively. Nitrogenous BOD was detected after 17-26 d in both estuaries only in the g/L.