. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. XOTES 87 cutoff wheel, but it is equally useful if the cutting is to be done on a lapidary trim saw. The 4- X continuous rim cutoff blade is oil cooled while rotating at 3,200 surface ft per min. For cutting orientation, the side opposite the grooved inner face of the otolith is marked from edge to edge through the nucleus. The best sections are obtained by cutting through the otolith nucleus along the longitudinal axis or
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. XOTES 87 cutoff wheel, but it is equally useful if the cutting is to be done on a lapidary trim saw. The 4- X continuous rim cutoff blade is oil cooled while rotating at 3,200 surface ft per min. For cutting orientation, the side opposite the grooved inner face of the otolith is marked from edge to edge through the nucleus. The best sections are obtained by cutting through the otolith nucleus along the longitudinal axis or through its perpendicular (Figure 1). These sections will show the growth rings approximately at a right angle from the face of the cut (the effect is similar to what one would see in looking at an open Venetian blind).. NUCLEUS FIGURE 1 —Drawing of an otolith showing the best cutting axes for wafers used in determination. age Dental Impression Compound (Kerr No. 2. soft green) having alow melting point (123 F) is used to affix the otolith to a 1- X 1- X 2-inch pine block. This mounting medium reduces the number of heat-cracked otoliths, and can be shaped and molded with the fingers while still plastic. Frequent moistening of the fingers on a damp towel will pre- vent the hot compound from adhering and burning. The face of the pine block is heated over a Bunsen flame to a point where the compound will melt and How on to the surface of the block. This insures a good bond. Additional compound (three or four times the otolith volume) is added and heated until it is soft and pliable, but not liquid. The otolith is then positioned and pushed into the com- pound, which is then molded over the otolith's edges to encapsulate all but the orientation pencil mark (Figure 2). "When the compound cools, four or five to wafers are cut, each including a segment of the nucleus. Next, the wooden block with the wafered otolith is immersed in warm water to soften, b
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