FISHERY BULLETIN: VOL. 86, NO. 4 



PT. DUME 



1 18'00' 



LOS ANGELES 



34'00' 



5 2°^^ ^° 



KM 



• OTTER TRAWL 

 LONGLINE 



NEWPORT BEACH 



DANA PT. 



Figure 1.— Map of the study area. 



footrope, 4.1 cm (stretched) body mesh, and 1.3 cm 

 (stretched) cod end liner was towed along an isobath 

 at approximately 2.5 knots for 10 minutes. 



Seventy-one trips were made with commercial 

 longline fishermen between June 1983 and Novem- 

 ber 1984 (Fig. 1). A unit (tub) of longline gear con- 

 sisted of about 650 m of groundline bearing approx- 

 imately 600 hooks (4/0 and 5/0 standard rockcod) on 

 short leaders. Salted pieces of Engraulis mordax 

 and, to a lesser extent, Scomber japonictis were used 

 as bait. Three to six tubs tied together formed a set. 

 Usually, lines were set between the hours of 1000 

 and 1400 and retrieved the following day between 

 0600 and 1000. 



Sinking and floating longlines were set. On sink- 

 ing sets, weights (bricks) were tied to either end of 

 the groundline and at intervals along the line. On 



floating sets, weights and floats (soda bottles) were 

 tied alternately to groundline; the distance between 

 two weights encompassed 50-60 hooks. Anchors 

 and buoy lines were attached to each end of the 

 groundline. Floating and sinking lines were set on 

 mud, but only floating lines were set on banks. Sets 

 on the mud ranged from 400 to 600 m deep; sets 

 on the banks ranged from 350 to 550 m deep. 



Scyliorhinid sharks were taken to the laboratory 

 where they were measured to the nearest 1 mm total 

 length (TL) and weighed to the nearest 0.1 g. The 

 left clasper of males was measured to the nearest 

 0.5 mm. The gonads were removed and weighed to 

 the nearest 0.1 g. All eggs larger than 4 mm in diam- 

 eter were separated from the ovary and measured 

 to the nearest 1 mm. Stomachs were removed and 

 placed in 10% buffered formalin; the contents were 



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