The role of fish in the diet of swordfish (Xiphias gladius) in the Strait of Gibraltar
To study the diet of the swordfish (Xiphias gladius) in the Strait of Gibraltar, a total of 176 stomachs were examined from the Moroccan artisanal fishery targeting this species, from April to September 2015. The frequency of occurrence (FO), percentage in number and in weight of prey as well as the...
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| Veröffentlicht in: | Journal of the Marine Biological Association of the United Kingdom 2018-06, Vol.98 (4), p.895-907 |
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| creator | Abid, Noureddine Laglaoui, Amin Arakrak, Abdelhay Bakkali, Mohammed |
| description | To study the diet of the swordfish (Xiphias gladius) in the Strait of Gibraltar, a total of 176 stomachs were examined from the Moroccan artisanal fishery targeting this species, from April to September 2015. The frequency of occurrence (FO), percentage in number and in weight of prey as well as the per cent index of relative importance of prey (%IRI) were calculated to assess the diet preferences of swordfish in relation to its body size, sex and month. Our findings confirm the opportunistic feeding behaviour of swordfish. The prey items consist primarily of fish (54.6% in number and 82.7% in weight), followed by cephalopod (43.36% in number and 17.25% in weight). The Atlantic horse mackerel (Trachurus trachurus) and the southern shortfin squid (Illex coindetii) are the most important prey, with a % IRI of 47.54 and 35.04%, respectively. The results revealed that there are no significant differences in the diet preferences among sexes and size classes. However, diet composition varied significantly among months. A significant correlation was found between the body length of predator and prey size. The remarkable decrease in the fullness index (fi) from June to August suggests that swordfish were in a spawning condition, with reduced feeding. |
| doi_str_mv | 10.1017/S002531541700011X |
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The frequency of occurrence (FO), percentage in number and in weight of prey as well as the per cent index of relative importance of prey (%IRI) were calculated to assess the diet preferences of swordfish in relation to its body size, sex and month. Our findings confirm the opportunistic feeding behaviour of swordfish. The prey items consist primarily of fish (54.6% in number and 82.7% in weight), followed by cephalopod (43.36% in number and 17.25% in weight). The Atlantic horse mackerel (Trachurus trachurus) and the southern shortfin squid (Illex coindetii) are the most important prey, with a % IRI of 47.54 and 35.04%, respectively. The results revealed that there are no significant differences in the diet preferences among sexes and size classes. However, diet composition varied significantly among months. A significant correlation was found between the body length of predator and prey size. The remarkable decrease in the fullness index (fi) from June to August suggests that swordfish were in a spawning condition, with reduced feeding.</description><identifier>ISSN: 0025-3154</identifier><identifier>EISSN: 1469-7769</identifier><identifier>DOI: 10.1017/S002531541700011X</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>Artisanal fisheries ; Body length ; Body size ; Carangid fisheries ; Catch per unit effort ; Cephalopod fisheries ; Composition ; Diet ; Ecology ; Feeding ; Feeding behavior ; Feeding habits ; Feeding preferences ; Fish ; Fisheries ; Fishing ; Illex coindetii ; Laboratories ; Mackerel ; Marine fishes ; Marine molluscs ; Predators ; Prey ; Spawning ; Studies ; Swordfish ; Trachurus trachurus ; Weight ; Xiphias gladius</subject><ispartof>Journal of the Marine Biological Association of the United Kingdom, 2018-06, Vol.98 (4), p.895-907</ispartof><rights>Copyright © Marine Biological Association of the United Kingdom 2017</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c345t-f8556245a45410bb30fd53c65f1ebfa524a4f8c145e095ca0b256e6a9748514b3</citedby><cites>FETCH-LOGICAL-c345t-f8556245a45410bb30fd53c65f1ebfa524a4f8c145e095ca0b256e6a9748514b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.cambridge.org/core/product/identifier/S002531541700011X/type/journal_article$$EHTML$$P50$$Gcambridge$$H</linktohtml><link.rule.ids>164,314,776,780,27901,27902,55603</link.rule.ids></links><search><creatorcontrib>Abid, Noureddine</creatorcontrib><creatorcontrib>Laglaoui, Amin</creatorcontrib><creatorcontrib>Arakrak, Abdelhay</creatorcontrib><creatorcontrib>Bakkali, Mohammed</creatorcontrib><title>The role of fish in the diet of swordfish (Xiphias gladius) in the Strait of Gibraltar</title><title>Journal of the Marine Biological Association of the United Kingdom</title><addtitle>J. Mar. Biol. Ass</addtitle><description>To study the diet of the swordfish (Xiphias gladius) in the Strait of Gibraltar, a total of 176 stomachs were examined from the Moroccan artisanal fishery targeting this species, from April to September 2015. The frequency of occurrence (FO), percentage in number and in weight of prey as well as the per cent index of relative importance of prey (%IRI) were calculated to assess the diet preferences of swordfish in relation to its body size, sex and month. Our findings confirm the opportunistic feeding behaviour of swordfish. The prey items consist primarily of fish (54.6% in number and 82.7% in weight), followed by cephalopod (43.36% in number and 17.25% in weight). The Atlantic horse mackerel (Trachurus trachurus) and the southern shortfin squid (Illex coindetii) are the most important prey, with a % IRI of 47.54 and 35.04%, respectively. The results revealed that there are no significant differences in the diet preferences among sexes and size classes. However, diet composition varied significantly among months. A significant correlation was found between the body length of predator and prey size. The remarkable decrease in the fullness index (fi) from June to August suggests that swordfish were in a spawning condition, with reduced feeding.</description><subject>Artisanal fisheries</subject><subject>Body length</subject><subject>Body size</subject><subject>Carangid fisheries</subject><subject>Catch per unit effort</subject><subject>Cephalopod fisheries</subject><subject>Composition</subject><subject>Diet</subject><subject>Ecology</subject><subject>Feeding</subject><subject>Feeding behavior</subject><subject>Feeding habits</subject><subject>Feeding preferences</subject><subject>Fish</subject><subject>Fisheries</subject><subject>Fishing</subject><subject>Illex coindetii</subject><subject>Laboratories</subject><subject>Mackerel</subject><subject>Marine fishes</subject><subject>Marine molluscs</subject><subject>Predators</subject><subject>Prey</subject><subject>Spawning</subject><subject>Studies</subject><subject>Swordfish</subject><subject>Trachurus trachurus</subject><subject>Weight</subject><subject>Xiphias gladius</subject><issn>0025-3154</issn><issn>1469-7769</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNp1kEFLw0AQhRdRsFZ_gLeAFz1EZ7M7u8lRiq1CwUOr9BZ2k91mS9rU3RTx35u0FQ_iaeC9770ZhpBrCvcUqHyYASTIKHIqAYDSxQkZUC6yWEqRnZJBb8e9f04uQlj1jJDpgLzPKxP5pjZRYyPrQhW5TdR2WulM22vhs_Hl3rhduG3lVIiWtSrdLtz9oLPWK7eHJ057VbfKX5Izq-pgro5zSN7GT_PRczx9nbyMHqdxwTi2sU0RRcJR8e5w0JqBLZEVAi012ipMuOI2LShHAxkWCnSCwgiVSZ4i5ZoNyc2hd-ubj50Jbb5qdn7TrcwT6IhMSoYdRQ9U4ZsQvLH51ru18l85hbx_X_7nfV2GHTNqrb0rl-a3-v_UN04ab7s</recordid><startdate>20180601</startdate><enddate>20180601</enddate><creator>Abid, Noureddine</creator><creator>Laglaoui, Amin</creator><creator>Arakrak, Abdelhay</creator><creator>Bakkali, Mohammed</creator><general>Cambridge University Press</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7QG</scope><scope>7SN</scope><scope>7TN</scope><scope>88A</scope><scope>8FE</scope><scope>8FH</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>H95</scope><scope>HCIFZ</scope><scope>L.G</scope><scope>LK8</scope><scope>M7N</scope><scope>M7P</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope></search><sort><creationdate>20180601</creationdate><title>The role of fish in the diet of swordfish (Xiphias gladius) in the Strait of Gibraltar</title><author>Abid, Noureddine ; Laglaoui, Amin ; Arakrak, Abdelhay ; Bakkali, Mohammed</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c345t-f8556245a45410bb30fd53c65f1ebfa524a4f8c145e095ca0b256e6a9748514b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Artisanal fisheries</topic><topic>Body length</topic><topic>Body size</topic><topic>Carangid fisheries</topic><topic>Catch per unit effort</topic><topic>Cephalopod fisheries</topic><topic>Composition</topic><topic>Diet</topic><topic>Ecology</topic><topic>Feeding</topic><topic>Feeding behavior</topic><topic>Feeding habits</topic><topic>Feeding preferences</topic><topic>Fish</topic><topic>Fisheries</topic><topic>Fishing</topic><topic>Illex coindetii</topic><topic>Laboratories</topic><topic>Mackerel</topic><topic>Marine fishes</topic><topic>Marine molluscs</topic><topic>Predators</topic><topic>Prey</topic><topic>Spawning</topic><topic>Studies</topic><topic>Swordfish</topic><topic>Trachurus trachurus</topic><topic>Weight</topic><topic>Xiphias gladius</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Abid, Noureddine</creatorcontrib><creatorcontrib>Laglaoui, Amin</creatorcontrib><creatorcontrib>Arakrak, Abdelhay</creatorcontrib><creatorcontrib>Bakkali, Mohammed</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Animal Behavior Abstracts</collection><collection>Ecology Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Biology Database (Alumni Edition)</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>Biological Science Collection</collection><collection>ProQuest Central</collection><collection>Natural Science Collection</collection><collection>Earth, Atmospheric & Aquatic Science Collection</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>ProQuest Central Student</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>SciTech Premium Collection</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>ProQuest Biological Science Collection</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biological Science Database</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><jtitle>Journal of the Marine Biological Association of the United Kingdom</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Abid, Noureddine</au><au>Laglaoui, Amin</au><au>Arakrak, Abdelhay</au><au>Bakkali, Mohammed</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The role of fish in the diet of swordfish (Xiphias gladius) in the Strait of Gibraltar</atitle><jtitle>Journal of the Marine Biological Association of the United Kingdom</jtitle><addtitle>J. Mar. Biol. Ass</addtitle><date>2018-06-01</date><risdate>2018</risdate><volume>98</volume><issue>4</issue><spage>895</spage><epage>907</epage><pages>895-907</pages><issn>0025-3154</issn><eissn>1469-7769</eissn><abstract>To study the diet of the swordfish (Xiphias gladius) in the Strait of Gibraltar, a total of 176 stomachs were examined from the Moroccan artisanal fishery targeting this species, from April to September 2015. The frequency of occurrence (FO), percentage in number and in weight of prey as well as the per cent index of relative importance of prey (%IRI) were calculated to assess the diet preferences of swordfish in relation to its body size, sex and month. Our findings confirm the opportunistic feeding behaviour of swordfish. The prey items consist primarily of fish (54.6% in number and 82.7% in weight), followed by cephalopod (43.36% in number and 17.25% in weight). The Atlantic horse mackerel (Trachurus trachurus) and the southern shortfin squid (Illex coindetii) are the most important prey, with a % IRI of 47.54 and 35.04%, respectively. The results revealed that there are no significant differences in the diet preferences among sexes and size classes. However, diet composition varied significantly among months. A significant correlation was found between the body length of predator and prey size. The remarkable decrease in the fullness index (fi) from June to August suggests that swordfish were in a spawning condition, with reduced feeding.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/S002531541700011X</doi><tpages>13</tpages></addata></record> |
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| ispartof | Journal of the Marine Biological Association of the United Kingdom, 2018-06, Vol.98 (4), p.895-907 |
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| source | Cambridge University Press Journals Complete |
| subjects | Artisanal fisheries Body length Body size Carangid fisheries Catch per unit effort Cephalopod fisheries Composition Diet Ecology Feeding Feeding behavior Feeding habits Feeding preferences Fish Fisheries Fishing Illex coindetii Laboratories Mackerel Marine fishes Marine molluscs Predators Prey Spawning Studies Swordfish Trachurus trachurus Weight Xiphias gladius |
| title | The role of fish in the diet of swordfish (Xiphias gladius) in the Strait of Gibraltar |
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