FEEDING AND ASSIMILATION OF MYSIS RELICTA1,2

Abstract

Feeding habits and assimilation efficiencies wcrc studied for Mysis relicta from Char Lake, N.W.T., and Stony Lake, Ontario.Stony Lake animals were rather voracious predators, feeding on Daphnia and other cladocerans during their vertical migration at night. Char Lake mysids fed primarily on diatoms and inorganic particles on a moss substrate. The gravimetric method showed an assimilation efficiency of 85% for Stony Lake mysids feeding on Daphnia pzhlex; the Conover ash-ratio method showed 52%. Results of the ashratio method corrected for ash assimilation, using the gravimetric data, gave an assimilation efficiency of 87%, indicating that ash assimilation can account for the difference between the two methods. A negative assimilation efficiency was obtained by the ash-ratio method for Char Lake mysids feeding on moss washings, suggesting that mysids may bc able to select organic material from the substrate.

Predator-prey interactions between two species of estuarine mysid shrimps

“…This follows the pattern described for other predatory feeding mysids (Lasenby & Langford 1973, Cooper & Goldman 1980, Siegfried & Kopache 1980, Johnston & Lasenby 1982). The flexibility of the feeding habits of R. terranatalis is well illustrated following riverine flooding of the Sundays estuary (Wooldridge & Bailey 1982).…”

“…This has been well documented in cold limnetic waters, following the introduction of Mysis relicta as a food source for fish populations. Although regarded as an opportunistic omnivore (Gi-ossnickle 1982), changes in zooplankton communities after the introduction of M. relicta were ascribed to predation by the mysid (Lasenby & Langford 1973, Morgan et al 1978, Goldman et al 1979, Lynch 1979, Cooper & Goldman 1980, Murtaugh 1981.…”

The Effects of Front‐Associated Wind Events and Resultant Sediment Resuspension on Dietary Habits and Caloric Intake of Bay Anchovy and Age‐0 Atlantic Croaker in Mobile Bay, Alabama

“…When they ate mysid shrimp, Atlantic Croaker either ate them in large quantities or hardly at all. We suspect that consumption could be enhanced either (1) by uncovering and exposing burrowing mysids to foraging Atlantic Croaker or (2) by increased turbidity that makes mysids more susceptible to predation because low light levels similar to that experienced during nighttime elicits a foraging response by the predatory marine mysids, causing them to exit their burrows to feed (Lasenby and Langford 1973;FIGURE 6. Bubble volume denotes mean percent dry weight of prey in the diets of age-0 Atlantic Croaker captured on quiescent (wind < 4 m/s) and windy (wind ≥4 m/s) days.…”

The foregut of the Mysida (Crustacea, Peracarida) and its phylogenetic relevance

“…There seem to exist only tendencies towards pure carnivory, herbivory and/or detritivory (Webb & Wooldridge 1989;Modlin 1993;Metillo & Ritz 1994). The mysid diet changes according to distribution or depth range of species (Tchindonova 1959), according to the season (Jansen et al 1983;Zagursky & Feller 1985), or even within 24 h, from benthic detritivore^herbivore during the day to a carnivorous diet at night, as in Mysis relicta (Lasenby & Langford 1973).…”