Quantitative and qualitative variables of semen from surubim do Iguaçu, Steindachneridion melanodermatum Garavello, 2005 (Siluriformes: Pimelodidae)

Abstract The objective of the present work was to assess the qualitative and quantitative characteristics of semen from the surubim do Iguaçu (Steindachneridion melanodermatum). Induced spermiation was achieved in eleven males with mean weight of 1.76 ± 0.48 kg and average age of two years and semen was collected by stripping. The average volume was 1.34 ± 0.73 mL. The duration of sperm motility was 154.4 ± 72.6 and 149.0 ± 77.5 seconds after activation with hatchery water and distilled water, respectively. The sperm concentration estimated by hemocytometer was 5.423 ± 2.155 x 1010 spermatozoa/mL. The results indicate that S. melanodermatum semen is easily obtained during the spawning season and the seminal characteristics are adequate insemination and subsequent in vitro fertilization.

摘要 本研究旨在评估伊瓜苏苏里比姆（Steindachneridion melanodermatum）精液的定性与定量特征。本研究对11尾平均体重1.76±0.48 kg、平均年龄2岁的雄性个体实施诱导排精，并通过挤精法采集精液。其平均精液体积为1.34±0.73 mL。分别以孵化用水与蒸馏水激活精子后，精子运动持续时长分别为154.4±72.6秒与149.0±77.5秒。经血细胞计数板估算的精子浓度为5.423±2.155×10¹⁰ 精子/mL。结果表明，在繁殖季节可便捷获取S. melanodermatum的精液，且其精液特性可满足人工授精及后续体外受精的需求。