Decapterus macarellus
Size: to 12"
Habitat: coastal waters
Notes: Scads are diminutive Jacks. Late in the season huge schools of 3-4" babies may be found in the rivers and swarming around the inshore reefs. Note the detached rays on the dorsal and anal fins near the tail, forming a finlet like a mackerel. They are mainly harvested for bait but are also sometimes eaten dried or salted.
Glass is a hard substance, usually brittle and transparent, composed chiefly of silicates and an alkali fused at high temperature.
Most glass is a mixture of silica obtained from beds of fine sand or from pulverized sandstone; an alkali to lower the melting point, usually a form of soda or, for finer glass, potash; lime as a stabilizer; and cullet ( waste glass ) to assist in melting the mixture. The properties of glass are varied by adding other substances, commonly in the form of oxides, e.g., lead, for brilliance and weight; boron, for thermal and electrical resistance; barium, to increase the refractive index, as in optical glass; cerium, to absorb infrared rays; metallic oxides, to impart color; and manganese, for decolorizing.
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