Ps Gill Engineering Drawing Pdf Download
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Ps Gill Engineering Drawing Pdf Download
gill rakers. number of primary rakers: 1. gill raker length; from the tip of the raker to the basal knob on the basal spine of the gill raker: 2.8-4.3 (mode 3.5) in lateral view; 0.8-1.3 (mode 1.2) in dorsal and ventral views. no appreciable difference between haplochromis dusky argens and haplochromis argens. gill rakers form seven to 10 pairs across the first half of the dorsal and ventral series, the first (anterior) half composed of larger rakers. in both species, the last pair of rakers is most posterior; then rakers decrease in length but increase in number along the series until the last (posterior) pair of rakers, which have about the same length as those on the first half. gill rakers in the first dorsal fin half have more serrate-like tips than those in the gill cover and in the second half. for both species, all sizes of rakers occur on the posterior half of the dorsal and ventral gill cover, with the largest size on the first dorsal fin half, and the smallest on the posterior half.
bridging of the gill fold and opercle (fig. 3). from juvenile to adult, the gill fold and opercle appear to be bridged more or less from the anterior to the posterior part of the opercle and from the lateral to the medial side of the opercle. the anterior part of the opercle is always silvery-greyish, whereas the posterior part of the opercle has a bluish-blackish colour. the junction of the anterior and posterior parts of the opercle appears whitish in young specimens, bluish-blackish in older ones. when the opercle is complete the anterior part of the opercle is bluish to purplish grey, while the posterior part is ivory-white, greyish or blackish. the anterior part of the opercle bends anteriorly with increasing age, and as a result the posterior part of the opercle appears longer or shorter. when the gill fold and opercle are completely bridged it is not possible to determine to which side the bridge extends. 3d9ccd7d82
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