Gray Angels have smooth-edged spines at the corner of each of their preopercle bones. This spine has a serrated edge in juveniles. Juvenile Gray Angels are quite different in coloring from adults.
Acipenseriformes: Caudal fin heterocercal; myodome and preopercle reduced or absent; gulars absent; skeleton largely cartilaginous; fin rays more numerous than their basals; intestine with spiral valve.
See Fishbase.
Families in this order: ...
You can distinguish Crenicichla tesay from its close relatives by the existence of a serrated posterior preopercle border, the number of scales on the E1 row, the length of the snout, and the colour pattern which consists of a suborbital stripe, ...
a soapfish breathing heavily or behaving abnormally, remove them from the tank, and separate them from the soapfish, immediately. When capturing a soapfish use a specimen container as this is less stressful to the fish. The spines on the preopercle ...
 See also: Variety, Water, Spine, Heart, Dorsal
  
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