Head length
the distance from the tip of the snout or upper lip to the most distant point of the opercular membrane (gill cover).
Any bird netting used on a pond or tank to exclude them MUST be at least a bird's head length plus neck length away from the water because they will stick their heads through some larger mesh netting (1.25" bar mesh) to fish in a pond or tank.
prima (11-12, vs. 9-10); greater head length than B. fusca (51.3-54.3% predorsal length, vs. 47.2-49.4); smaller predorsal length than B. fusca and B. prima (62.1-67% SL, vs. 68.1-70.2); smaller postdorsal length than B. prima (21.9-23.4% SL, vs. 24.
· Body length terms = TL for total length (head length for seahorses), SL for the standard length (without the tail), Fl for the fork length, W'D for the width of the discs of skates and rays, OT for the length (height) of sea horses.
need a very large tank with very powerful filtration as it grows to more than 12 inches and possibly 2 feet as maximum size. It has black body and fins hence the name and a large dorsal fin, with anterior branched dorsal rays longer than head length: ...
5 times in its length, middle of orbit located at anterior 0.25?0.27 of HL, head width 0.61?0.70 times in head length, three rows of premaxillary teeth, caudal fin uniformly dark, heavily pigmented pectoral fin and 39?42 total vertebrae.
One question I have is should the diameter of the holes increase as the head length increases ? I will have holes aimed at the floor of the tank with the direction of flow out towards the perimeters.
 See also: Fish, Species, Water, Origin, Feeding
  
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