. The Biological bulletin. Biology; Zoology; Marine biology. FISH FEEDING STIMULANTS 155 I Fish uu - 80 - 60 - Crustaceans T 40 - 20 - 0 - Ju*LXl.*_^ Molluscs. ^-. W%^4%°o,\-% W^>^% %% %% combined. Likewise, glycine is the major single compo- nent in crustaceans when the analyses of both decapods and euphausids are combined. Among the pelecypod molluscs, taurine and betaine are the dominant components in three of the four species (Fig. 4 and Table II). In the Pacific razor clam {Siliqua patula), however, taurine is the dominant substance fol- lowed by glycine, alanine, and then betaine. Eve
. The Biological bulletin. Biology; Zoology; Marine biology. FISH FEEDING STIMULANTS 155 I Fish uu - 80 - 60 - Crustaceans T 40 - 20 - 0 - Ju*LXl.*_^ Molluscs. ^-. W%^4%°o,\-% W^>^% %% %% combined. Likewise, glycine is the major single compo- nent in crustaceans when the analyses of both decapods and euphausids are combined. Among the pelecypod molluscs, taurine and betaine are the dominant components in three of the four species (Fig. 4 and Table II). In the Pacific razor clam {Siliqua patula), however, taurine is the dominant substance fol- lowed by glycine, alanine, and then betaine. Even greater variability exists among the cephalopod molluscs. Betaine and taurine are the two dominant components in the oc- topus {Octopus dofJeini) and in one species of squid {Illex argentimis). In the remaining three squid species, the two dominant components are betaine and TMO in /. ille- cebrosus and /. and proline and glycine in Loligo vulgaris. Glycine is the dominant component in extracts of all eight species of decapod crustaceans (Fig. 5 and Table II). In addition, four substances (glycine, betaine, arginine, and proline) are among the top six components in all of the species except the pink shrimp {Penaeus duomrum). Even the pink shrimp has glycine, betaine, and proline among its top six components. The three euphausid crustaceans show marked simi- larities in composition (Fig. 5 and Table II). TMO is the dominant substance in each species. Also, excluding be- Figure 3. Mean concentrations (±SEM) and sequential ranking of the 10 major components in mollusc extracts compared with those in crustaceans and fish. Data and abbreviations as described in Figure 2 and Table II. only TMO appears among the top five substances in the invertebrate extracts. Creatine was the dominant com- ponent in six fish species; lactic acid was dominant in three species, and TMO was dominant in a single species, the Pacific hake {Merlucchis productus). In two species, the Atlantic mack
Size: 2334px × 1071px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
