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8Hark Attack. Off Thr California and Oregon Coast: an Update, 1980-84 Robert N. and Daniel J. Miller Marine Rerourcmr Branch

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8Hark Attack. Off Thr California and Oregon Coast: an Update, 1980-84 Robert N. and Daniel J. Miller Marine Rerourcmr Branch Shark attacks off the California and Oregon coast: an update, 1980-84 Item Type monograph Authors Lea, Robert N.; Miller, Daniel J. Publisher California Department of Fish and Game, Marine Resources Branch Download date 28/09/2021 05:30:37 Link to Item http://hdl.handle.net/1834/18408 8hark attack. off thr California and Oregon Coast: an update, 1980-84 Robert N. and Daniel J. Miller Marine Rerourcmr Branch California Department of Fish and Oamm 2201 Oardmn Road Monterey, California 93940 RBSTRFICT. In 1981 Miller and Collier reported on 47 ur~prclvoked shark attacks which had taken place rllff Cal ifornia and Oregon from July 1'326 to November 1973. Since that date, 12 shark attacks involving hurnans have taken place: two in 1388, one in 1381, four in 1'383, one in 1983, and four in 1984. Encompassed in these 12 attacks were: six surfers, three skin divers, one paddle boarder, one scuba diver, arid cine swimmer. In ten of the twelve attacks the white shark was the species of imp1 icat ion. by geographic area: one attack occurred off southern California, four off central California, four off norther-n Califot-nia, and three off Oregon. In 1981 Miller and Collier reported on all shark attacks clccur-ring off California and Oregon from 1926 through 197'3. Their analysis included 47 unprovoked attacks: 45 off California and t wl:~ off Oregon. Since 1'379, 12 unpr~avoked shark at t acks I Research associate in Ichthy~~logy,Natural History Museum of LI=I~Rngeles County involving humans have taken place within this geographic area: two in 1308, one in 1381, four in 1382, one in 1383, and four in 1984 (these attacks took place while this paper was in press and are included primarily as sumr~~aries- to 18 Nov 84). The 12 attacks involved six surfers, three skin divers, one paddle boarder, one scuba diver, and one swimmer. In five cases there was no injury ~I=I the victim,in two cases minor injury, in three cases major injury (hospital i zat ion), and two attacks proved fatal. In ten c~fthe 12 attacks the white shark, Carcharodg_n c__acchacigs (Linnaeus), fami ly Lamnidae, was the species implication. In the other two attacks only the fact that a shark (of r..tnknown species) was involved could be establ ished. Rs pointed out by Baldridge ( 1974), "considerable variance exists in published accounts of what happened, again clearly attesting to the difficulties in gathering meaningful information on shark attacks of the past. " This, coupled with the fact that ocean-water sports such as skin diving, scuba diving, surfing, paddle boarding, kayaking, wind surf ing, etc. have increased in popularity during recent years, makes cornparing early shark attack informat ion.with more recent data a difficult and somewhat quest ionabl e proposi t ion. By geographic area: one attack occurred in southern Calif~~rnia(south uf Point Conception), four off central Ca 1 ifornia (between San Francisccl Bay and Pt. Concept ion), four off nothern California, and three 13ff the c~=rastof Oregon. FI geographical listing of California-Oregon shark attacks is presented in Table 1; all attacks since 1926 are enumerated with a breakdown by county given. For-ty-six of the fifty-nine (78 per-cent) shark attacks for California and Oregon can be attributed unequivocally to the white shark (Table 1). R summary of white shark attacks by nionth is given in Ta~le2. FIlso, a summat-y of attacks sirtce 1'363, ind icat ing pericld bet ween attacks, 1s presented in Table 3. R chron~~logicalr~ar-rat ive of the twelve most recent shark attacks foll~z~ws. Since the last four attacks occurred while this paper was in press or~ly a brief summary of each of these incidents is qiven. Discussion Shrrb Bttasha~12ek83 ------attack. Ng, 48 - Curt Vikan. 17 October 1388, 8338 h; California: Humboldt Co., Moonstone Beach; lat 41 82.5' N, long Curt Vikan was surfing off Moonstone Beach in 6 to 8 ft of water, appr-oximately 188 yards r~ffshore, at time of the encounter. Without warning his boar-d was "ripped with tremendous force" from under him. Vik.an wastethered to the surfboard with a leash and could only watch as the shark held his board out of water for several secunds; "the shark was kind of playing with my board in the air." During this brief period the shark's tail brushed against Vikan. Once the shark released the board, the sur-fer irnrflediately caught a wave and paddled to shore. There was no injury to Vikan. FI tooth fr-agment was found in the fin of the surfboard and iderrt if ied by Dr. John DeMar-t ini, Hurflbclldt State Univet-sity, as that of a white shark. Rttack was to the rear of the surfboard; a small section of the board was bitten-off (Fig. 1). Srnal 1 arflour~tnof blood were foclnd ernbedded in the styrofoam of the board, apparent ly from the spongy t issue SI-~rroundingthe teeth of the attacking shark. The shark was estimated a5 12 plus ft by Vik.an. Moclr1stl2ne Beach had been the site of a white shark attack four- years earlier; Williarn Kennedy (Flttack No.42), also a sur-fer, was attacked on 18 October 1376. Qttack. _NVL 49 - Christopher Cowan. 27 October 1980, 1545 h; Oregon: Douglas Co., off Umpqua River, lat 43 3'3.7' N, lonq 124 i2.a' w. On the afternoon of 27 October 1980 Chris Cowan was surfing with two friends just south of the jetty at the entrance of the Umpqua River. The three surfers had been in the water approximately 25 minutes. Cowan was 150 m from shore and had just been thrown off his board by a large wave. Upon regaining the surfb13ard a heavy impact knocked Cowan from his board and he was aware of a strong tugging sensat ion on the leash that tied his foot to the surfboard. Upon release of tension, Cowan mounted his board and not iced that his left leg was injured and bleeding. He called to his companions that a shark was in the vicinity and began paddling rapidly toward shore. His tw13 surfing companions, st i 11 unaware that Cowan had been injured or of the presence of a shark, continued to surf. Upon reaching shore, Cowan sent a messenger out on the jetty to warn his friends. Upon receiving the signal of distress the two sur-fet-s irnmedi ate1y headed for shor-e. C13wan was then driven to Bay Rrea H1:lspital in Coos Bay where four lacerat ions on the left leg above the knee were 51-ttured; he was then released. The injury to Cowan is considered mir~or althouqh the potential is obvious. Examination of the surfboard (2.2 m in length and 50 crn in width ; under sur-face of board uni forrn bri ght orange, upper surface bright yellow) revealed a number of tooth impressions. The damaged area of the board was on the left side and centered 64 cm ft-orn the rear. Tooth impressions were noted primarily on the lower surface of the board. In the area of damage equating with the mandibular symphysis, two rows of teeth were apparent. The upper 51-irfaceof the board was damaged at the edge and along the circumference of the jaw out line; damage was much less severe than that to the bottom. The greatest width of the impression on the upper surface measured 360 mm. Cowan was wearing a black neclprene dry st-lit. We treat this case as involving the white shark. attack. fjp, sg - Lewis Boren. 19 Decernber 138 1, aft ernuon; California: Munterey Co, Spanish Pay, lat 36 37. S9N, lung 121 57. 1W. The Lewis Boren incident probably has received the most publicity of any California shark encounter since the fatal attack of Barry Wilson in October 1350 (Bolin 1954). Not only was the attack fatal, but the fact that Eoren's body was not rec~~veredfor five days led to wild speculation by the media uf the fate of the victim and tlzl the size of the attacklrlg shark. Lewis B~~renhad chosen to surf by himself on a cold and windy Sat l.ttmday ( 13 Decernber 1'381 ) at Spanish Bay off Rsi lomat- State Beach. He had last talked to friends about 1488 h before leaving to knee surf on his 5ft 4 in. board. The following mc~r-ning ('216 Dee), sutmfersChrist ian Kai and David Murphy, walking along Qsilomar Beach found a surfboard with a portion missing along with the matching cresent-shaped sect ion; "the two pieces were abcllat 15 yards apart." That afternoon the board was turned c~ver to the Sal inas Pol ice Department who passed it on to the supervising ranger at Rsi lomar State Beach. On Monday (21 Dec), a missing persons t-eport was filed by one of Boren's friends corrcerr~ed that Lew bar-en had not been seen nor his vehicle moved from Qsilc~niar-State Eeach in two days. On the morning of Tuesday the 22nd, we were able to examine the surfboard at the Monterey Marine Res~~urcesLaborat ury. The board was yellow on both upper and luwer surface, measured 163 cm in length and 61 cm in width. The removed portion was 774 mm from the tip of the board and measur-ed 488 mm wide by 259 mm deep (Figure 2). The approximate area of attack was to the left center side of the board.
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