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n. pl.1.(Zool.) An order of the Entomostraca.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
We hypothesized that (1) the numbers of juvenile fish have significantly increased, (2) the abundance and biomass of copepods and cladocerans have decreased, and (3) the zooplankton consumption by juvenile fish is higher than that by adult planktivores.
The search queries included combinations of keywords such as Mexico, ecosystems, aquatic, lagoon, estuary, bay, lake, river, wetland, pollution, pollutant, COPs, heavy metals, PCBs, PAHs, biomonitor, biomarker, genotoxic, histopathological, oxidative stress, cytotoxic, aquatic organisms, fish, bivalves, clams, crustaceans, aquatic birds, rotifers, and cladocerans, among others, both in Spanish and in English.
For experiments as well as for routine feeding of the larvae, we cultured separately three species of zooplankton (2 cladocerans and 1 branchiopod).
The copepods were found dominant followed by rotifers and cladocerans for entire study period.
In cladocerans, diazinon at the concentration from 0.18 to 0.30 [micro]g x [L.sup.-1] caused adverse effects on the survival of D.
Unlike marine fish species, freshwater fish larvae depend more on small cladocerans than copepods, and rotifers are also common as the first food (Gerking, 1994; Soares et al., 1997).
Diet studies of age-0 freshwater drum have been limited to lakes and reservoirs, where they have been described as consuming cladocerans, chironomid larvae, mayfly larvae, and occasionally larvae of other fishes (Swedburg and Walburg, 1970; Clark and Pearson, 1979; Bur, 1982).
Cladocerans were identified to species, while copepod copepodites and nauplii were identified to suborder; The densities of each taxon were calculated using flow meter readings.
Zooplankton (number [l.sup.-1]) 1531.3 [+ or -] 26.3a (%) Copepods 49 (%) Rotifers 35.7 (%) Cladocerans 15.4 Parameters Diets D0 1.Water quality Transparency (cm) 16.4 [+ or -] 2.4 Temperature ([degrees]C) 29.3 [+ or -] 1.5 pH 5.7 [+ or -] 0.2 Dissolved oxygen (mg [l.sup.-1]) 4.2 [+ or -] 1.7 Conductivity ([micro]S cm-1) 110.1 [+ or -] 15.3 Nitrite (mg [l.sup.-1]) 0.01 [+ or -] 0.00 Ammonium (mg [l.sup.-1]) 0.06 [+ or -] 0.01 2.