Effects of air exposure on mortality and growth of undersized pikeperch, Sander lucioperca, at low water temperatures with implications for catch-and-release fishing

Abstract As undersized fish have to be released after capture in most recreational fisheries, the potential mortality associated with this practice is of interest to managers and anglers. The objective of this study was to assess the effects of air exposure on mortality and growth in pikeperch, Sander lucioperca (L.), <500 mm (total length) at low water temperatures (around 10 °C). Fish were exhaustively exercised by manual chasing for 120 s, exposed to air for 0, 60, 120 or 240 s, and afterwards stocked into two ponds to measure mortality and growth rates. Neither mortality nor growth was statistically significantly different among different durations of air exposure. However, mortality was the lowest in both ponds for fish with no air exposure, which suggested that air exposure adversely affected survival. Mortality was inversely related to length and body mass of pikeperch in one of the two ponds. From a management perspective, it is suggested to avoid air exposure in angled pikeperch that are to be released.     

阿莫莱玫瑰葡萄的生长结果特性及优质丰产栽培技术

阿莫莱玫瑰葡萄(マスカットヂュークアモーレ)是日本植源葡萄研究所用亚历山大×黑三尺杂交种子选育的欧亚种晚熟葡萄品种,在日本综合性状表现优良。为了了解和掌握该品种在以上海为中心的华东地区的生长结果习性和栽培方法,上海市农工商现代农业园区开发有限公司于2009年从日本植源葡萄研究所引进该品种进行试栽培。栽培试验运用多种树体管理技术,在土、肥、水管理,病虫害综合防治防控等方面进行重点技术突破,并对该品种的生物学特性、结果特性、物候期进行了观察和记载。经过5年的试验、观察和讨论,总结出了该品种的生长结果特性及优质丰产栽培技术,认为该品种果穗大,具有浓郁的玫瑰香味,品质优良,植株长势中庸,丰产性能好,抗病性强,适宜在江浙沪及山东、安徽等华东地区推广种植。     

Analysis of Exhaustive Service Polling System with Bulk Arrival

The exhaustive service polling system with bulk arrival,and the distribution and mean of the queue length and the cycle time,service time and interval time of the server and the distributions of sojourn times are studied.     

龙眼干制前后缓解小鼠疲劳作用的研究

研究龙眼干制前后缓解疲劳作用的差异。把ICR雄性小鼠按体重随机分成4组,每组10只,分别为空白对照组、阳性对照组、鲜龙眼组、龙眼干组。按0.2 mL/10 g的剂量连续灌胃21天,称量第1、7、14、21天灌胃1 h后小鼠的质量,测定第21天小鼠的力竭游泳时间、负重游泳后肝糖原、血尿素氮、血乳酸脱氢酶的含量。与空白对照组相比,龙眼干极显著延长小鼠的力竭游泳时间(P<0.01),提高肝糖原(P<0.01)、血乳酸脱氢酶(P<0.05)的含量,显著降低血尿素氮含量(P<0.05);鲜龙眼能显著延长小鼠的力竭游泳时间(P<0.05)、降低血尿素氮含量(P<0.05),极显著增加血乳酸脱氢酶含量(P<0.01)。龙眼干制前后均具有缓解疲劳的效果,龙眼干比鲜龙眼提供更多的糖原合成底物可能是缓解疲劳效果更优的原因之一。