Department of Ichthyology and Aquaculture, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, Poland; ChemProf Olsztyn, Poland.
Department of Ichthyology and Aquaculture, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, Poland; Department of Veterinary Prevention and Feed Hygiene, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Poland.
Anim Reprod Sci. 2022 Aug;243:107025. doi: 10.1016/j.anireprosci.2022.107025. Epub 2022 Jun 16.
Pikeperch is one of the major new fish species in freshwater aquaculture. Artificial reproduction is difficult in this species, and many aspects require further study. These include synchronization of female maturation, latency time, gamete quality and spawner survival rate. For these reasons, many fish farmers must constantly replenish their spawning pikeperch stock, often with wild fish. Data on the suitability for the reproduction of wild fish obtained in several lakes during the reproduction period were collected in this study. The findings indicated that larger fish (> 1.5 kg BW) and those obtained in larger and deeper lakes (> 12.0 m mean depth vs. < 5.0 m mean depth, respectively, for deep and shallow lakes) were more valuable to fish farmers during the spawning season when they were obtained because a higher percentage of suitability for artificial reproduction and a higher embryo survival rate was observed for them. The mean embryo survival rate was high and was 84.5 ± 3.9 % on the 3rd day after fertilization and 79.7 ± 3.4 % at hatching. Among the group of the smallest females (< 1.5 kg), the highest percentage of nonsynchronous oocyte maturation occurred. This result demonstrated the successful procedure of both artificial reproduction and a successful method for selecting females for spawning.
五道黑是淡水养殖的主要新鱼类品种之一。该物种的人工繁殖较为困难，许多方面都需要进一步研究。这些方面包括雌鱼成熟的同步性、潜伏期、配子质量和产卵鱼成活率。由于这些原因，许多养鱼户必须不断补充其繁殖五道黑的种群，通常是使用野生鱼。本研究收集了繁殖期在几个湖泊中获得的关于野生鱼繁殖适宜性的数据。研究结果表明，在繁殖季节，体型较大的鱼（> 1.5 公斤 BW）和在较大和较深的湖泊中获得的鱼（分别为深湖和浅湖，深湖的平均水深> 12.0 米，浅湖的平均水深< 5.0 米）对养鱼户更有价值，因为观察到它们更适合人工繁殖，胚胎成活率更高。平均胚胎成活率较高，受精后第 3 天为 84.5±3.9%，孵化时为 79.7±3.4%。在最小的雌性群体（< 1.5 公斤）中，出现了最高比例的非同步卵母细胞成熟。这一结果证明了人工繁殖的成功程序以及选择产卵雌鱼的成功方法。
