STUDY OF FOOD AND FEEDING OF PERCH, PERCA-FLUVIATILIS L IN WINDERMERE
STUDY OF FOOD AND FEEDING OF PERCH, PERCA-FLUVIATILIS L IN WINDERMERE
复制标题
DOI：
10.1111/j.1365-2427.1978.tb01426.x
复制
发表时间：
1978-01-01
影响因子：
2.7
通讯作者：
CRAIG, JF
中科院分区：
文献类型：
--
作者：
CRAIG, JF
从6月到10月，在整个24小时内，每隔一段固定的时间间隔，对河鳕(Perca Flviatilis)的胃内容物进行采样。1973年和1975年2月至1月。1976年。从11月到4月，它们被发现以底栖生物为食，在5月和6月，它们以底栖生物和浮游生物为食，从7月到10月，它们被发现以鲈鱼苗和浮游动物为食。栖息在较宽的体型范围内，以相似的猎物为食。鱼的胃内容物的重量表现出很大的变异性。开发了一种基于积分系统的方法来估计在已知时间内给定重量的鱼在胃中的食物重量。从这些数据中可以明显看出随季节变化的摄食模式。胃排空率被假定为指数，并根据食物摄入量为零时夜间胃内容物重量的下降来计算。在平均水温为11.0℃时，速率为0.18mgh-1。在平均水温为17度的条件下，水温降至0.35 mg·h-1。7月份的C。假设食物消耗量遵循线性摄入量，标准巴伊科夫方法被认为是计算每日食物消耗量的适当模型。计算一年中所有月份(11月至4月和9月)每天的食物消耗量(干重毫克)为150克鲈鱼。和10月被合并)。当食物摄入量为零，但胃排空继续时，计算了第二组数值，对渔具上花费的时间进行了修正。基于温伯格假说(1956年)的S假说和生长数据得出的150克雄性鲈鱼的日摄食量数据与用能量表示的第二组数值没有显著差异。当某些假设得到检验时，生长数据和温伯格的S方程结合在一起可能是计算温德米尔种群能量收支的一种合适的方法。
Perch (Perca fluviatilis) were sampled for their stomach contents at regular intervals throughout 24 h from June-Oct. in 1973 and from Feb. 1975-Jan. 1976. They were found to feed on benthic organisms from Nov.-April, on benthos and plankton during May and June and on perch fry and zooplankton from July-Oct. Perch over a wide size range feed on similar prey. Fish showed great variability in the weight of their stomach contents. A method based on a points system was developed to estimate the weight of food in the stomach for a given weight of fish at a known time. A diel feeding pattern which varied with the season was apparent from these data. Rates of gastric evacuation were assumed to be exponential and were calculated from the drop in night-time stomach content weights when food intake was assumed to be zero. The rates ranged 0.18 mg h-1 at a mean water temperature of 11.degree. C in May to 0.35 mg h-1 at a mean water temperature of 17.degree. C in July. Assuming that food consumption followed a linear rate of intake, the standard Bajkov method was considered an adequate model to calculate daily food consumption. Daily food consumption (milligrams of dry weight) was calculated for 150 g perch for all months of the year (Nov.-April and Sept. and Oct. being combined). A 2nd series of values was calculated making corrections for the time spent in the fishing gears when food intake was zero but gastric evacuation continued. Daily food consumption figures for 150 g male perch based on Winberg''s hypotheses (1956) and growth data showed no significant differences from this 2nd series of values, when both were expressed in energy terms. When certain assumptions have been tested, growth data and Winberg''s equations together may be a suitable method for calculating an energy budget for the Windermere [England] perch population.