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匙吻鲟早期生活史可分为仔、稚、幼鱼３期。出膜至２３～２５日龄，全长约５７ｍｍ时为仔鱼期。此期形态变化以吻部最为显著，由钝状占全长的１５％，发育至扁平桨状，接近全长的３０％。稚鱼期结束时（６７～７３日龄），鳍条发育完成，鳍式为背鳍（Ｄ）３７～４４，臀鳍（Ａ）３３～４５，胸鳍（Ｐ）２１～２６，腹鳍（Ｖ）２３～３０，尾鳍（Ｃ）７９～９１，全长约１６４ｍｍ。生长７３日后为幼鱼期，全长＞１６４．０ｍｍ，吻长大于全长的３０％，身体各部分比例与成体相似。在匙吻鲟早期发育中，其吻长、头长增长较迅速，而体高、眼径、尾柄高增长较为缓慢。
Key sturgeon early life history can be divided into Aberdeen, juvenile, juvenile 3. The membrane to 23 to 25 days of age, about 57mm full length for the larvae period. The morphological changes in this period to the Ministry of the most notable, from the blunt shape accounted for 15% of the total length, to flattened paddle-shaped, nearly full-length 30%. At the end of the juvenile period (67-73 days of age), the development of the fin rays is completed, the fin type is 37-44 of the dorsal fin (D), 33-45 of the anal fin (A), 21-26 of the pectoral fin (P), 23 ~ 30, caudal fin (C) 79 ~ 91, the total length of about 164mm. Growth for 73 days after the juvenile period, full length> 164.0mm, kiss grow longer than 30% of the total length of the body part of the proportion and adult similar. In the early development of Key sturgeon, its kiss length, head length growth more rapidly, and height, eye diameter, caudal peduncle high growth more slowly.