Eel fish growth rate
Eel fish growth rate
Eel fish growth rate To recognize the latitudinal distinction withinside the fundamental ecology of the massive mottled eel Anguilla marmorata, we measured its age, boom, and intercourse ratios in freshwater regions of Amami-Oshima Island, Japan (28.223°N–28.332°N and 129.329°E–129.439°E), close to the northern geographic restriction of its variety and in comparison those organic traits with the ones discovered withinside the tropical areas of Indonesia.
BACKGROUND Eel fish growth rate
Species withinside the genus Anguilla encompass catadromous fish that include leaf-like leptocephalus larvae that migrate from open oceans to freshwater and estuarine habitats (Han et al. 2016; Chen et al. 2018; Higuchi et al. 2018).
After metamorphosing into yellow eels, the fish spend maximum in their existence in continental waters till they start their downstream migration in the direction of spawning grounds in open ocean. The anguillid eel includes 19 species and subspecies disbursed globally, apart from polar areas and the west coast of North and South America
The massive mottled eel A. marmorata is the maximum widely disbursed species withinside the genus, with a selection from the south-east African coast to Asia and Polynesia (Ege 1939; Marquet and Galzin 1991; Marquet 1996). It is likewise one in every of the most important species withinside the genus, developing up to two m and 21 kg (Castle 1984).
Despite this outstanding ecology, to date, little fundamental organic facts is to be had at the massive mottled eel, probable due to the fact in comparison with the Japanese eel A. japonica (Lee and Lou 2019) and the European eel A. anguilla, the mottled eel isn’t a prime species withinside the aquaculture industry.
MATERIALS AND METHODS Eel fish growth rate
This take a look at turned into performed withinside the Yakugachi, Sumiyo, and Kawauchi Rivers on Amami-Oshima Island, Kagoshima Prefecture, Japan (Fig. 1). This island is positioned about 380 km south of the southern tip of the Kyushu mainland and 250 km north of Okinawa.
The common annual temperature of this island (1981–2010) is 21.6°C, that’s 3.0°C better than that of the mainland of Kagoshima, and the once a year fluctuation is small.
The annual precipitation is 2837.7 mm, with the month-to-month precipitation exceeding a hundred and fifty mm even in winters; moreover, it’s miles a specifically wet a part of Japan (records from Japan Meteorological Agency).
The island is concept to be close to the northern distribution restriction of A. marmorata (Jacoby and Gollock 2014).
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