琵琶湖産鯉科3種の産卵習性

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Opsariichtys uncirostris (T. et S.) The Junior author observed the spawning habits of this fish at the mouth of the Inukami River emptying into the Lake Biwa on June 3, 1946. The spawning was taken place in the clear slow stream with sand and gravel bottom mostly in a couple. The long anal fin of male was used for the purpose of insemination and for the dispersion of the eggs in the stream. Eggs were 1.3-1.6 mm in diameter, nearly spherical in form, transparent and slightly adhesive. Yolk granules were yellow or orange-red. At one hour after fertilization, eggs measured 2.0 mm in diameter in an average. Incubation required 52-767 hours at the water temperature of 21-24℃. Newly hatched larva measured 5.7 mm in total length. Hemibarbus barbus (T. et S.) The spawning habits were observed at the same occasion. The act was performed by several males together with a female. Newly spawned egg was spherical, light eddish brown in color and measured 1.8-2.2 mm in diameter. The egg membrane being rather thick, rsemitransparent and extremely adhesive. At one hour after fertilization, eggs measured 2.7-3.0 mm in diameter. Development required 70-90 hours at the water temperature of 23℃. Newly hatched larva was 7.9 mm in total length. The eyes were pigmented. Hemigrammocypris rasborella (FOWLER) Eggs of H. rasborella were collected by junior author ata pond of Shiga-ken Fisheries Experiment Station, Hikone, on June 18, 1946. The eggs were found attached to the roots of reeds or leaves of various kinds of land plants covered by water. The water temperature was 27.0℃ at 11.30 a.m. The egg of the present species, being the smallest one of the Japanese cyprinid eggs, was 1.00 mm in diameter. Newly hatched larva measured 3.33 mm in total length.
社団法人日本動物学会の論文
1947-05-20

琵琶湖産鯉科3種の産卵習性

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