NOTE Matthews: Movement behavior of Ophiodon elongatus off Vancouver Island 



785 



ternally attached using methods used for tuna (Holland 

 et al. 1985). The nylon loop on the transmitter anchored 

 one inelastic pull tie, with another tie wrapped around 

 the tag's opposite end. The two pull ties were inserted 

 through the dorsal musculature and cinched down to 

 prevent the transmitter from dangling. 



Figure 1 



Map of study area and general displacement directions for 

 Ophiodon elongatus fish nos. 7-11. Fish were captured and 

 displaced in the direction shown by arrow. 



Lingcod were captured on hook-and-line, placed in 

 a seawater-filled cooler, and anesthetized (methomidate 

 hydrochloride). After tags were attached, lingcod were 

 allowed to recover in fresh (without anesthetic) sea- 

 water prior to release. Fish appeared completely recov- 

 ered from the anesthetic and tagging procedure ~5-10 

 min after tagging. 



Eleven transmitters with replaceable batteries (Vem- 

 co V3-1H-R pingers, Vemco Ltd., Nova Scotia, Canada 

 B3L 4J4) were operated at five crystal-controlled fre- 

 quencies: 50.0 (2 tags), 60.0 (2 tags), 65.54 (3 tags), 

 69.0 (2 tags), and 76.8 (2 tags) kHz, corresponding to 

 pre-set channels on the Vemco VR-60 receiver. Tags 

 assigned to the same channel were easily differentiated 

 by their unique pulse period, which was automatically 

 decoded and displayed by the receiver. To locate the 

 transmitters, a Vemco V-10 directional hydrophone 

 was employed from a small boat. Once a tag was 

 located, the boat's position was determined, using 

 LORAN-C readings, depth, and visual compass bear- 

 ings of four charted features (buoys, lights, etc.), in the 

 study area on an almost daily basis (one of 21 tracking 

 days was missed due to boat breakdown) for the life 

 of the transmitter (21 d battery life). One reason this 

 study area was chosen was the presence of several 

 flashing lights and buoys which made navigation and 

 location determination easier, especially at night. 



During 5-27 April 1990, 11 Hngcod (57.0-80.6cm 

 total length, TL) were tagged and monitored (Table 1). 



