Forrestal Francesca C, McDonald M Danielle, Burress Georgianna, Die David J
Cooperative Institute of Marine and Atmospheric Science, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA.
Marine Ecosystems and Society, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA.
Conserv Physiol. 2017 Jun 8;5(1):cox035. doi: 10.1093/conphys/cox035. eCollection 2017.
Yellowtail snapper () is an important part of the reef fish assemblage in the western, tropical Atlantic and is caught by both recreational and commercial fisheries in south Florida and the Bahamas. It is estimated that 80% of snapper caught within southeastern Florida waters are discarded due to minimum size restrictions. Neglecting to include information on delayed mortality of undersized fish has the potential for fishery managers to overestimate the abundance of smaller size classes and introduce bias into stock assessments. This study examines associations between reflex impairment, traditional physiological parameters and post-release mortality of undersized yellowtail snapper. Laboratory experiments exposed yellowtail snapper to a gradient, simulating capture conditions. Blood draws were obtained from a sub-sample of fish. There was a significant relationship between delayed mortality and the proportion of reflex impairment for both individual fish and groups of fish ( < 0.001 and = 0.03). Within the sub-sample of blood-sampled fish, base excess and pH were significantly correlated to reflex impairment. Delayed mortality was significantly correlated to pH, base excess and lactate concentration. Results suggest that discarded, undersized yellowtail with more than 29% of their reflexes impaired will not survive.
黄尾笛鲷（）是西大西洋热带地区珊瑚礁鱼类群落的重要组成部分，在佛罗里达州南部和巴哈马群岛，休闲渔业和商业渔业都会捕捞这种鱼。据估计，由于最小尺寸限制，在佛罗里达州东南部水域捕获的笛鲷中有80%被丢弃。忽视纳入关于未达尺寸鱼类延迟死亡的信息，有可能使渔业管理人员高估较小尺寸类别的数量，并在种群评估中引入偏差。本研究调查了未达尺寸黄尾笛鲷的反射功能受损、传统生理参数与放流后死亡率之间的关联。实验室实验使黄尾笛鲷暴露于模拟捕捞条件的梯度环境中。从一部分鱼样本中采集血液。个体鱼和鱼群的延迟死亡率与反射功能受损比例之间均存在显著关系（<0.001且=0.03）。在采集血液样本的鱼样本中，碱剩余和pH值与反射功能受损显著相关。延迟死亡率与pH值、碱剩余和乳酸浓度显著相关。结果表明，反射功能受损超过29%的被丢弃未达尺寸黄尾笛鲷无法存活。
