1977
DOI: 10.1139/f77-274
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Food and Feeding of Spiny Dogfish (Squalus acanthias) in British Columbia Waters

Abstract: Stomach content data on 14,796 spiny dogfish (Squalus acanthias) from British Columbia waters are presented. The major dietary components based on occurrence were 55% teleosts, 35% crustaceans, and 5% molluscs. The principal food items were herring (22%) and euphausiids (14%). Prey was largely pelagic (80%), with fishes predominating in winter and invertebrates in summer. Fishes became more important in the diet with increasing dogfish size. Dogfish consumed twice as much food in summer as in winter. Annual co… Show more

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Cited by 98 publications
(76 citation statements)
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“…Dogfish ate a broad range of prey types (Table 6) and sizes, which is similar to other dogfish species, such as Squalus acanthias, that maintain a varied diet throughout their life history (Jones & Geen 1977, Hanchet 1991, Tanasichuk et al 1991. The mean width of prey consumed by dogfish was much smaller than their maximum gape width (pw: gw = 0.19).…”
Section: Diet Composition Prior To Fishingmentioning
confidence: 63%
“…Dogfish ate a broad range of prey types (Table 6) and sizes, which is similar to other dogfish species, such as Squalus acanthias, that maintain a varied diet throughout their life history (Jones & Geen 1977, Hanchet 1991, Tanasichuk et al 1991. The mean width of prey consumed by dogfish was much smaller than their maximum gape width (pw: gw = 0.19).…”
Section: Diet Composition Prior To Fishingmentioning
confidence: 63%
“…Interestingly, food remnants had not reached the anus by this time, so initial concerns (Series 1) about defecation contaminating N-flux measurements proved unfounded. A slow time course (relative to that of teleosts) for digestion, assimilation and gut passage appears to be characteristic of elasmobranchs (Jones and Geen, 1977;Wetherbee et al, 1987;Schurdak and Gruber, 1989;Wetherbee and Gruber, 1990;Cortes and Gruber, 1990;Sims et al, 1996). Fig.·1.…”
Section: Discussionmentioning
confidence: 98%
“…It is also apparent that essentially nothing is known about the consequences of feeding in elasmobranchs, not even whether urea-N or ammonia-N excretion increases after feeding in these ureotelic animals. Mommsen and Walsh (1991) speculated that, since urea-N is much more costly to synthesize than ammonia-N, it would make sense for elasmobranchs to excrete excess nitrogen in the form of the latter after feeding, whereas Wood (2001) speculated that, since elasmobranchs feed only sporadically in nature (Jones and Geen, 1977;Cortes and Gruber, 1990;Hanchet, 1991;Tanasichuk et al, 1991), they may be so Nlimited as to excrete virtually no 'excess nitrogen' but rather…”
mentioning
confidence: 99%
“…However, since 2005, we have initiated a research program in this area (reviewed by Wood et al, 2010) on the spiny dogfish shark (Squalus acanthias), chosen because it is an opportunistic predator that is relatively abundant, and because its feeding ecology has been well studied (Bonham, 1954;Holden, 1966;Jones and Geen, 1977;Tanasichuk et al, 1991;Hanchet, 1991;Laptikhovsky et al, 2001;Alonso et al, 2002). In nature, the dogfish consumes large meals at irregular intervals; many dogfish are caught with nothing in their stomach, but a single meal may be very large (1-10% of body mass).…”
Section: Introductionmentioning
confidence: 99%
“…In that study (Wood et al, 2007b), the animals were fed with dead hake (Merluccius productus), a teleost fish that is one of their most common natural prey items (Jones and Geen, 1977), with an internal osmolality only ~40% that of S. acanthias. It was concluded that the seawater drinking rate, which is very low, probably remained unchanged after feeding, but that nevertheless, the osmolality of the chyme was quickly raised to that of the blood plasma of the shark.…”
Section: Introductionmentioning
confidence: 99%