Stable Differences in Growth Rates of Juvenile Triploid Oysters Crassostrea gigas Thunberg (Osteidae)

IF 0.8 4区生物学 Q4 MARINE & FRESHWATER BIOLOGY Inland Water Biology Pub Date : 2023-12-01 DOI:10.1134/s1995082923060263

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Abstract

Three groups of mollusks of the triploid Pacific oyster Crassostrea gigas differing in morphometric parameters—fast-growing (FG) with a shell height of over 40 mm; medium-growing (MG), 15 mm < H < 40 mm; and slow-growing (SG), H < 15 mm—have been studied from the Donuzlav estuary (Black Sea). Stable differences have been revealed in the growth rates of juveniles of the same age. Mollusks of the FG group are dominant in weight gain and linear dimensions throughout the study. The average daily increase in the shell height of the studied mollusks ranges from 0.1 to 0.35 mm/day, with maximum values in June and September. The weight increases with different rates: on average, 0.051 g/day in the SG groups, 0.168 g/day in the MG group, and 0.287 g/day in the FG group. The peaks of this parameter have been recorded in August and September, reaching 0.12, 0.26, and 0.43 g/day, respectively. The shell height of slow-growing polyploid oysters has a negative allometry (b = 2.17), while the other two groups are characterized by a clear positive allometry (b = 3.23 for MG and 3.80 for FG); i.e., the increase in weight is faster than the linear growth in juveniles of the species. It has been suggested that polyploidy (triploidy) determines the differences in the growth rates of the same-aged mollusks. The allometry index b can be used to identify growth features at the early stages of oyster development.

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三倍体牡蛎幼体生长速度的稳定差异 Crassostrea gigas Thunberg (Osteidae)

摘要对来自顿努斯拉夫河口（黑海）的三倍体太平洋牡蛎（Crassostrea gigas）的三组形态参数不同的软体动物进行了研究：快速生长组（FG），壳高超过 40 毫米；中等生长组（MG），壳高 15 毫米；40 毫米；慢速生长组（SG），壳高 15 毫米。结果显示，同龄幼体的生长速度存在稳定的差异。在整个研究过程中，FG 组的软体动物在增重和线性尺寸方面占优势。所研究的软体动物的壳高平均每天增加 0.1 至 0.35 毫米，最大值出现在 6 月和 9 月。体重的增加速度各不相同：SG 组平均每天增加 0.051 克，MG 组平均每天增加 0.168 克，FG 组平均每天增加 0.287 克。该参数的峰值出现在 8 月和 9 月，分别达到 0.12 克/天、0.26 克/天和 0.43 克/天。生长缓慢的多倍体牡蛎的壳高（b = 2.17）呈负异方差，而其他两组则呈明显的正异方差（MG 组的 b = 3.23，FG 组的 b = 3.80）；也就是说，该物种幼体的体重增长速度快于线性增长速度。有人认为，多倍体（三倍体）决定了同龄软体动物生长速度的差异。异构指数 b 可用于识别牡蛎发育早期的生长特征。

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来源期刊

Inland Water Biology 生物-海洋与淡水生物学

CiteScore

1.30

自引率

55.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Inland Water Biology publishes thematic reviews and original papers devoted to flora and fauna in waterbodies, biodiversity of hydrobionts, biology, morphology, systematics, ecology, ethology, ecological physiology and biochemistry of aquatic organisms, patterns of biological cycle, structure and functioning of aquatic ecosystems, anthropogenic and uncontrolled natural impacts on aquatic organisms and ecosystems, invasion of nonindigenous species into ecosystems and their ecology, methods of hydrobiological and ichthyological studies.