Fig. 9. Influence of rearing temperature on dorsal and anal fin ray muscle development in Atlantic herring (Clupea harengus). (A) Embryos were incubated at 5 °C (open circles) or 12 °C (filled circles) until first feeding and then reared at ambient temperature. (B,C) Whole-mount larvae of 16.2 mm total length stained for acetylcholinesterase activity following the 5 °C (B) and 12 °C (C) rearing regimes. From Johnston et al. (2001). a, anus; frm, fin ray muscles; ms, myosepta. (D) Number of dorsal fin ray muscles (second-order polynomials were fitted to the data) and (E) number of anal fin ray muscles innervated in relation to total body length (TL) in larvae reared under the two thermal regimes shown in A. First-order linear regressions were fitted to the data.