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Western pygmy perch
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Western pygmy perch : ウィキペディア英語版
Western pygmy perch

The western pygmy perch (''Nannoperca vittata'') is a species of temperate perch endemic to southwest Australia. A relatively small fish, it can reach TL.
==Reproduction==
Pygmy perch are egg layers. They produce eggs singly, laying 12 to 15 over a period of up to three hours.
During the breeding season (July to November), both sexes become noticeably more colorful. Most of the male’s fins (except for the pectoral) become black, and its sides have an orange tinge on the lower and upper body. The upper portions of the female’s sides become bluish.
The eggs measure around 1.2 mm and are slightly adhesive, which allows them to cling to submerged plants, rocks, or debris. Spawning usually occurs in the latter part of the morning.
Hatching occurs after around three days from laying. The 3-mm larvae look quite different from juveniles of the species and have no mouth for several days, but are recognizably perch-like after around 27 to 30 days.

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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