Early Life History Descriptions of the Deepbody and Slough Anchovies with Comparisons to the Northern Anchovy (Family Engraulidae)
Abstract:Larval descriptions of Anchoa compressa and A. delicatissima are based upon laboratory-reared specimens and larvae collected from Newport Bay, California. Eggs ofengraulid species indigenous to the southern California Bight are pelagic, lack an oil globule and have a segmented yolk. Anchoa compressa eggs are nearly spherical and average 0.80 mm in diameter. Eggs of A. delicatissima and Engraulis mordax are ellipsoid; major axis averages 0.94 mm and 1.33 mm respectively; minor axis averages 0.57 mm and 0.66 mm respectively. Newly hatched Anchoa larvae are unpigmented and relatively undifferentiated. Preanal lengths of larvae less than 10 mm range from 68 to 70% SL and progressively decline to values less than 63% SL in post-flexion larvae. Median fin ontogeny commences with the dorsal fin at 3.7 mm followed by the anal fin at 4.5 mm and caudal fin at 5.1 mm. Pigmentation is primarily restricted to a paired melanophore row located ventrally on the intestine. Anchoa larvae are distinguished from E. mordax by lower preanal myomere counts (20–26 vs. 26–31), greater dorsal-anal fin overlap lengths, higher anal fin ray counts and dorsolateral gut pigmentation located near the anus.
Document Type: Research Article
Publication date: 1988-03-01
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