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Figure 7


Fig. 7. Cross sections of gill filaments from (A) O. mykiss, (B) C. auratus, (C) H. lacerdae and (D) H. malabaricus showing double immunolabelling of 5-HT (green) and SV2 (red; Ai–Di) and 5-HT (green) and zn12 (red; Aii–Dii). (E) Schematic of a filament cross section showing the location of the efferent filament artery (eFA), central venous sinus (cvs), afferent filament artery (aFA), lamellar pillar cells (pc) and companion vessels (cv) [adapted from Farrell (Farrell, 1979)]. Note that lamellae are rarely sectioned in a straight plane. Scale bars, 100 µm.