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Big-scale sand smelt
The big-scale sand smelt (''Atherina boyeri'') is a species of fish in the Atherinidae family.〔World Conservation Monitoring Centre 1996. (''Atherina boyeri'' ). (2006 IUCN Red List of Threatened Species. ) Downloaded on 4 August 2007.〕 It is a euryhaline amphidromous fish, up to 20 cm in length.
==Description==
It is a small pelagic fish species which occurs near the surface in the littoral estuarine zone: in lagoons, salt marshes (77 psu), shallow brackish areas (2 psu) and inland waters which are rather unsuitable for other fish species, due to their high ionic strength and salinity.
Body is rather long, slender, moderately flattened. Eyes are large. Head and body are scaly. Mouth is protractible, upwardly directed, with small teeth. Lower jaw has an upper expansion within mouth (high dentary bone). There are two separate dorsal fins, with all rays of first and 1-2 anterior rays of second dorsal fin being unsegmented. The anal fin is similar to the second dorsal fin, while the caudal fin is forked. The first dorsal fin has 6-10 flexible spines.〔(Review of Croatian selected scientific literature on species mostly exploited by the national small-scale fisheries ) on FAOAdriaMed.org〕
It is a carnivorous species feeding on zoo-plankton and small bottom-living animals (crustacean gammarids, polychaete worms and molluscs).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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