![]() ![]() Photomicrograph of a cross-section of a red snapper otolith with 30 dark annual growth rings. After cutting a thin cross-section from the center of the otolith, inspection under a microscope reveals concentric dark growth rings that are akin to the growth rings seen in trees (see figure below). Please send your questions and feedback to How long can a red snapper live? Age of most marine fishes (except sharks and rays) is estimated from examinations of the otoliths (earbones) that are located beneath the brain and function much like the human inner ear (balance and detection of vibrations). Therefore, this engine’s manufacture date was January 15, 1999.īiology & Life History. The final two digits designate the plant and assembly line. The following two digits (15) are the day of the month. The next two digits (01) are the month of the year, which is January. The first two digits (99) denote the year of manufacture. The following is an example of interpreting the date for the code number 99011556. This system provides an easy way to determine the age of your small engine. The engine's indicates the exact date it was manufactured. Engines can be found through the following link - B&S Antique Engine Dating Chart. The engine's code number indicates the exact date it was manufactured. ![]()
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