Pictured here is a developing embryo inside of one of the unusually shaped eggs of a seven-lined prickleback (Ernogrammus zhirmunskii), which is a small fish found in the Northwest Pacific and Sea of Japan. The egg is around 2mm to 3mm in size, photographed here at a magnification of four times life-size. The eggs are in a cluster, with each egg interlocked with others around it. Other eggs and fish embyros are visible in the background.
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