Self-fertilization in a gonochoristic fish yellow catfish

Q1 Agricultural and Biological Sciences
Yue Yu , Ziyi Lu , Min Chen , Ya Liu , Yang Ding , Chenhao Hu , Zhigang Shen
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引用次数: 0

Abstract

Sex control techniques are in great demand for aquaculture because of the huge benefits of mono-sex production. In a previous study on yellow catfish (Tachysurus fulvidraco), intersex individuals were produced by administrating 17α-methyltestosterone (MT) or aromatase inhibitor letrozole (LZ). The ovarian and testicular portions of intersexual gonads developed well and were completely separated, arousing our interest in producing self-fertilizable fish and clone-like fish populations. In this study, yellow catfish fry were treated with a combination of MT and LZ at a low dose (5 mg kg−1 MT, 300 mg kg−1 LZ) at a low water temperature (27.0 °C, mixed sex-producing temperature, LL group) and a high temperature (33.5 °C, male-producing temperature, HL group), and with a high dose (10 mg kg−1 MT, 600 mg kg−1 LZ) at a low water temperature (LH group), during 12–65 days post-hatching, the critical period of sex differentiation. Both XX and XY intersex were produced with different percentages at the same time through co-treatment with MT and LZ, with or without the help of male-producing temperature. The highest percentage of XY intersex (53% in XY, 36% in XX and XY) and XX intersex (47% in XX, 25% in XX and XY) was produced in LH and HL groups, respectively. Results of gonadal morphology, histology, and sperm dynamic analysis indicate that some XX and XY intersex individuals were capable of self-fertilization through artificial insemination. The reproductive performance of these intersex individuals was then investigated by injecting spawning agents, dissecting gonads, and artificially fertilizing eggs with their own sperm. The XX, XY, and YY genotypic individuals were produced by the self-fertilization of XY intersex individuals. The present study successfully produced high percentages of XX and XY intersex and conducted self-fertilization by mating the eggs and sperm of a single intersex individual. Self-fertilization in fish will show great potential in aquaculture genetics and breeding, for example, generating highly homozygous (or ‘‘clonal’’) genetic material, producing mono-sex populations, and identifying unknown sex determination modes. In particular, the cloning method of producing genetic materials will be greatly beneficial for maintaining advantageous traits through self-fertilization generation after generation.

黄颡鱼的自交作用
由于单性生产的巨大效益,水产养殖业对性别控制技术的需求量很大。在之前对黄颡鱼(Tachysurus fulvidraco)的研究中,通过施用 17α-甲基睾酮(MT)或芳香化酶抑制剂来曲唑(LZ)产生了双性个体。双性性腺的卵巢和睾丸部分发育良好并完全分离,这引起了我们对生产可自交鱼类和克隆鱼类种群的兴趣。在这项研究中,黄颡鱼鱼苗在孵化后的 12-65 天(性别分化的关键时期)内,分别在低水温(27.0 °C,混合性别产生温度,LL 组)和高温(33.5 °C,雄性产生温度,HL 组)条件下使用低剂量(5 mg kg-1 MT,300 mg kg-1 LZ)的 MT 和 LZ 组合,以及在低水温(LH 组)条件下使用高剂量(10 mg kg-1 MT,600 mg kg-1 LZ)的 MT 和 LZ 组合。通过 MT 和 LZ 的共同处理,在有或没有雄性产生温度的帮助下,XX 和 XY 两性在同一时间产生的比例各不相同。LH 组和 HL 组分别产生了最高比例的 XY 两性胚胎(XY 为 53%,XX 和 XY 为 36%)和 XX 两性胚胎(XX 为 47%,XX 和 XY 为 25%)。性腺形态学、组织学和精子动态分析结果表明,一些XX和XY双性个体能够通过人工授精进行自受精。随后,通过注射催产剂、解剖性腺和用自身精子对卵子进行人工受精,研究了这些雌雄同体个体的生殖能力。XX、XY和YY基因型个体是由XY双性个体自交产生的。本研究成功培育出高比例的 XX 和 XY 两性个体,并通过单个两性个体的卵子和精子交配进行自交。鱼类自交将在水产养殖遗传学和育种方面显示出巨大的潜力,例如产生高同质性(或 "克隆")遗传物质、产生单性种群以及鉴定未知的性别决定模式。特别是,克隆方法生产的遗传物质将大大有利于通过一代又一代的自交来保持优势性状。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Aquaculture and Fisheries
Aquaculture and Fisheries Agricultural and Biological Sciences-Aquatic Science
CiteScore
7.50
自引率
0.00%
发文量
54
审稿时长
48 days
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