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This item is printed on demand. Paperback. 110 pages. Original publisher: Silver Spring, Md. : U. S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1993 OCLC Number: (OCoLC)709778330 Subject: Chondrichthyes -- North Atlantic Ocean. Excerpt: . . . Musick et al. : Trends Shark Abundance 7 in 1974-1979 46 SMOOTH DOG DUSKY 57 MISC. COASTAL 19 M1SCI EANIC sclLt ! ! lal;;: SANDBAR 269 SANDBAR 273 1981 1982-1989 SANDT1GEA 1S SMOOTH DOG 24 DUSKY 17 SCALLOP 7 Mise OCEANIC 13 f. . . SANDBAR 135 SANDBAR 278 1991 1990 SHARPNQSE 53 Mise OCEANIC L. . s 10 SANDBAR 175 SANDBAR 163 Figure 2 Relative abundance of shark species collected by VIMS longlines by year-group or year from 1974 through 1991. the survey period ( Fig. 4C ). The tiger shark generally ing behavior of this species. Although a slight decline is ill, was caught at depths 10 m; catch rates in the mid-suggested in Figure it is not of the magnitude shown continental shelf region ( 10-100 m ) declined almost by the other species, and normal variation in occurrence 80 ( Fig. 4E ). could explain this effect; however, more detailed CPUE analyses in CPUE for two species, the Atlantic sharpnose shark the following sections suggested possible de-( Rhizoprionodon terraenovae ) and the scalloped hammer-clines in abundance. The number of scalloped hammer-( Sphyma lewini ), head did not show the same distinct heads collected was similar to that of tiger sharks, but was trend in this analysis. Atlantic sharpnose sharks were there not such a distinct downward trend in CPUE, taken in substantial numbers during mid-summer, but although a decline is suggested by the data ( Fig. 4F ). catches were sporadic and clustered, reflecting the school- This item ships from La Vergne,TN.

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U.S. Government, Paperback, Italian-language edition, Pub by General Books LLC.