Short-term movement and dispersal patterns of barramundi in a seasonally closed freshwater habitat in the Northern Territory

Barramundi (Lates calcarifer) were captured by rod and reel angling using lures at Mission Billabong, a freshwater body within the Daly River catchment, southwest of Darwin, Northern Territory. The total length of each captured fish was measured and individuals were fitted with an external dart tag for identification purposes and also a radio transmitter tuned to a unique frequency. Individuals were released into the billabong and re-located once per day, when possible, with a 2MHz receiver. The movements of 29 fish were monitored in the wet (warm) season from 4 to 24 November 2002 and a further 31 fish were monitored in the dry (cool) season from 22nd July to 9 August 2003. When an individual was located, the transmitter number and GPS position was recorded. The distance between consecutive re-locations of individuals was calculated to define the extent of movements of individuals.
Short term movements patterns of barramundi (Lates calcarifer) were monitored in a seasonally closed freshwater system to determine whether movement and dispersal differed by individual or season.

研究对象为尖吻鲈（Barramundi，*Lates calcarifer*），于澳大利亚北领地达尔文市西南部戴利河流域内的淡水水体使命堰塘（Mission Billabong），采用搭配拟饵的手竿路亚钓法捕获。对每尾捕获个体的全长进行测量后，为其佩戴外置飞镖式标记标签以实现个体识别，并安装调谐至唯一频率的无线电发射机。随后将个体放归该堰塘，在条件允许的情况下每日使用2MHz接收机对其开展一次追踪定位。本研究于2002年11月4日至24日的湿季（暖季）对29尾尖吻鲈的活动进行监测，并于2003年7月22日至8月9日的干季（凉季）对另外31尾个体进行监测。当追踪到目标个体时，记录其发射机编号与GPS定位坐标。通过计算个体两次连续追踪定位间的直线距离，以确定其活动范围。
本研究对季节性封闭淡水系统内尖吻鲈的短期活动模式进行监测，旨在明确个体间或季节间的活动与扩散模式是否存在差异。