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Alternative Prey Reduces Largemouth Bass Predation Mortality on Newly Stocked Channel Catfish Fingerlings
North American Journal of Fisheries Management ( IF 1.1 ) Pub Date : 2021-05-08 , DOI: 10.1002/nafm.10647 Cory Becher 1 , Stephen M. Tyszko 2 , Richard D. Zweifel 3 , Joseph D. Conroy 2 , Jeremy J. Pritt 2 , Stuart A. Ludsin 1
North American Journal of Fisheries Management ( IF 1.1 ) Pub Date : 2021-05-08 , DOI: 10.1002/nafm.10647 Cory Becher 1 , Stephen M. Tyszko 2 , Richard D. Zweifel 3 , Joseph D. Conroy 2 , Jeremy J. Pritt 2 , Stuart A. Ludsin 1
Affiliation
Management agencies commonly stock Channel Catfish Ictalurus punctatus as advanced yearlings instead of fingerlings (age 0) to help reduce potential predation mortality despite uncertainty regarding the degree to which predation limits fingerling poststocking survival. To better understand whether fingerling survival during the first 7 d after stocking—when predation risk is likely greatest—could benefit from the presence of alternative prey fish, we conducted an experiment in 0.4-ha ponds (N = 18; 6 ponds/treatment) that measured fingerling (TL range = 56–186 mm) survival in ponds with predators only (adult Largemouth Bass Micropterus salmoides; mean TL = 327 mm; SE = 21), with predators and alternative prey fishes (Bluegill Lepomis macrochirus and Goldfish Carassius auratus), or with neither (i.e., control ponds). Without alternative prey, fingerling Channel Catfish survival 1 week after stocking was significantly (P < 0.01) lower (89%) than in the ponds with alternative prey (98%) or in the control treatment with no predators (97%). Our experiment also indicated the potential for alternative prey to promote fingerling survival by reducing water clarity, not just by serving as a buffer from predation. Further research, however, is needed to determine the degree to which our findings apply to larger ecosystems and to learn whether stocked fingerlings survive well enough after the initial stocking period to achieve desired management goals. Even so, our results suggest that alternative prey can reduce Largemouth Bass predation mortality on fingerlings immediately after stocking, which could influence Channel Catfish stocking approaches in some managed systems.
中文翻译:
替代猎物降低了新放养的沟鲶鱼种的大口黑鲈捕食死亡率
尽管捕食限制鱼种放养后存活的程度存在不确定性,管理机构通常将斑点鲶鱼作为高级一岁鱼而不是鱼种(0 龄)进行饲养,以帮助降低潜在的捕食死亡率。为了更好地了解放养后前 7 天的鱼种存活率(此时捕食风险可能最大)是否可以从替代猎物鱼的存在中受益,我们在 0.4 公顷池塘(N = 18;6 个池塘/处理)中进行了一项实验测量鱼种(TL 范围 = 56-186 毫米)在只有捕食者(成年大口黑鲈Micropterus salmoides;平均 TL = 327 毫米;SE = 21)、捕食者和替代猎物鱼类(Bluegill Lepomis macrochirus)中的存活率和金鱼Carassius auratu s),或两者都没有(即对照池塘)。在没有替代猎物的情况下,放养后1周的鲶鱼鱼种成活率显着(P < 0.01) 比有替代猎物的池塘 (98%) 或没有捕食者的控制处理 (97%) 低 (89%)。我们的实验还表明,替代猎物有可能通过降低水的透明度来促进鱼种存活,而不仅仅是作为捕食的缓冲。然而,需要进一步的研究来确定我们的发现在多大程度上适用于更大的生态系统,并了解在初始放养期后放养的鱼种是否能很好地存活以实现预期的管理目标。即便如此,我们的结果表明,替代猎物可以降低放养后立即捕食大口黑鲈鱼种的死亡率,这可能会影响某些管理系统中的鲶鱼放养方法。
更新日期:2021-05-08
中文翻译:
替代猎物降低了新放养的沟鲶鱼种的大口黑鲈捕食死亡率
尽管捕食限制鱼种放养后存活的程度存在不确定性,管理机构通常将斑点鲶鱼作为高级一岁鱼而不是鱼种(0 龄)进行饲养,以帮助降低潜在的捕食死亡率。为了更好地了解放养后前 7 天的鱼种存活率(此时捕食风险可能最大)是否可以从替代猎物鱼的存在中受益,我们在 0.4 公顷池塘(N = 18;6 个池塘/处理)中进行了一项实验测量鱼种(TL 范围 = 56-186 毫米)在只有捕食者(成年大口黑鲈Micropterus salmoides;平均 TL = 327 毫米;SE = 21)、捕食者和替代猎物鱼类(Bluegill Lepomis macrochirus)中的存活率和金鱼Carassius auratu s),或两者都没有(即对照池塘)。在没有替代猎物的情况下,放养后1周的鲶鱼鱼种成活率显着(P < 0.01) 比有替代猎物的池塘 (98%) 或没有捕食者的控制处理 (97%) 低 (89%)。我们的实验还表明,替代猎物有可能通过降低水的透明度来促进鱼种存活,而不仅仅是作为捕食的缓冲。然而,需要进一步的研究来确定我们的发现在多大程度上适用于更大的生态系统,并了解在初始放养期后放养的鱼种是否能很好地存活以实现预期的管理目标。即便如此,我们的结果表明,替代猎物可以降低放养后立即捕食大口黑鲈鱼种的死亡率,这可能会影响某些管理系统中的鲶鱼放养方法。