The age and growth of the greenhead tilapia Oreochromis macrochir (Pisces: Cichlidae) from the Okavango Delta, Botswana
Sectioned otoliths were used for age and growth determination of Oreochromis macrochir, a common cichlid species from the Okavango Delta, Botswana. The Okavango Delta is a vast inland wetland ecosystem which receives annual floodwaters from the highlands of southern Angola. Floodwaters reach the nor...
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| Veröffentlicht in: | Hydrobiologia 1996-03, Vol.321 (1), p.29-34 |
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| creator | Booth, A.J. (Rhodes Univ., Grahamstown (South Africa). Dept. of Ichthyology and Fisheries Science) Merron, G.S |
| description | Sectioned otoliths were used for age and growth determination of Oreochromis macrochir, a common cichlid species from the Okavango Delta, Botswana. The Okavango Delta is a vast inland wetland ecosystem which receives annual floodwaters from the highlands of southern Angola. Floodwaters reach the northern areas of the delta between January and March and the southern areas between June and September each year. Samples were collected from sites which receive flood waters between May and August. Marginal zone analysis showed that an annulus was formed between October and December during the dry, summer period. Maximum age estimates of eleven years were obtained and growth was described by the 3 parameter von Bertalanffy model as l sub(t) = 215.24(1-e super(-0.42(t+1.08))) mm SL. |
| doi_str_mv | 10.1007/BF00018674 |
| format | Article |
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(Rhodes Univ., Grahamstown (South Africa). Dept. of Ichthyology and Fisheries Science) ; Merron, G.S</creator><creatorcontrib>Booth, A.J. (Rhodes Univ., Grahamstown (South Africa). Dept. of Ichthyology and Fisheries Science) ; Merron, G.S</creatorcontrib><description>Sectioned otoliths were used for age and growth determination of Oreochromis macrochir, a common cichlid species from the Okavango Delta, Botswana. The Okavango Delta is a vast inland wetland ecosystem which receives annual floodwaters from the highlands of southern Angola. Floodwaters reach the northern areas of the delta between January and March and the southern areas between June and September each year. Samples were collected from sites which receive flood waters between May and August. Marginal zone analysis showed that an annulus was formed between October and December during the dry, summer period. Maximum age estimates of eleven years were obtained and growth was described by the 3 parameter von Bertalanffy model as l sub(t) = 215.24(1-e super(-0.42(t+1.08))) mm SL.</description><identifier>ISSN: 0018-8158</identifier><identifier>EISSN: 1573-5117</identifier><identifier>DOI: 10.1007/BF00018674</identifier><identifier>CODEN: HYDRB8</identifier><language>eng</language><publisher>Dordrecht: Springer</publisher><subject>AGE ; Biological and medical sciences ; BOTSWANA ; CRECIDA ; CRECIMIENTO ; CROISSANCE ; CRUE ; Development. Metamorphosis. Moult. Ageing ; EDAD ; FLOOD PLAINS ; Freshwater ; Fundamental and applied biological sciences. 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(Rhodes Univ., Grahamstown (South Africa). Dept. of Ichthyology and Fisheries Science)</creatorcontrib><creatorcontrib>Merron, G.S</creatorcontrib><title>The age and growth of the greenhead tilapia Oreochromis macrochir (Pisces: Cichlidae) from the Okavango Delta, Botswana</title><title>Hydrobiologia</title><description>Sectioned otoliths were used for age and growth determination of Oreochromis macrochir, a common cichlid species from the Okavango Delta, Botswana. The Okavango Delta is a vast inland wetland ecosystem which receives annual floodwaters from the highlands of southern Angola. Floodwaters reach the northern areas of the delta between January and March and the southern areas between June and September each year. Samples were collected from sites which receive flood waters between May and August. Marginal zone analysis showed that an annulus was formed between October and December during the dry, summer period. Maximum age estimates of eleven years were obtained and growth was described by the 3 parameter von Bertalanffy model as l sub(t) = 215.24(1-e super(-0.42(t+1.08))) mm SL.</description><subject>AGE</subject><subject>Biological and medical sciences</subject><subject>BOTSWANA</subject><subject>CRECIDA</subject><subject>CRECIMIENTO</subject><subject>CROISSANCE</subject><subject>CRUE</subject><subject>Development. Metamorphosis. Moult. Ageing</subject><subject>EDAD</subject><subject>FLOOD PLAINS</subject><subject>Freshwater</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>GROWTH</subject><subject>HIGH WATER</subject><subject>LLANURA ALUVIAL</subject><subject>OREOCHROMIS</subject><subject>Oreochromis macrochir</subject><subject>PLAINE D'INONDATION</subject><subject>Vertebrates: anatomy and physiology, studies on body, several organs or systems</subject><issn>0018-8158</issn><issn>1573-5117</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNpFkEFP4zAQhS0EEgX2skdOPiAEiLC248QJNyiwi1Rt91DO0dSeJIY0Lnag4t-vSys4jEYz-uZp3iPkJ2dXnDH16_aBMcaLXMkdMuKZSpOMc7VLRuttUvCs2CcHITxHSpWCjchq1iKFJlZvaOPdamipq-kQt41H7FsEQwfbwdICnXp0uvVuYQNdgPZxsJ6e_bNBY7imY6vbzhrAc1pH6FNk-gLv0DeO3mE3wCW9dUNYQQ9HZK-GLuCPbT8kTw_3s_GfZDL9_Ti-mSQ6leWQSJASxByVEoUWzCgsDJi5ySUvtdHGqDSrc4kqnyvOJaYa5yLaTKXMQRR5ekhON7pL717fMAzVYv1t10GP7i1UPMsKVX6CFxsw2grBY10tvV2A_6g4q9bZVt_ZRvhkqwpBQ1d76LUNXxcpU0KIMmLHG6wGV0HjI_J3UqooU_D0P0F8gIE</recordid><startdate>199603</startdate><enddate>199603</enddate><creator>Booth, A.J. 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Psychology</topic><topic>GROWTH</topic><topic>HIGH WATER</topic><topic>LLANURA ALUVIAL</topic><topic>OREOCHROMIS</topic><topic>Oreochromis macrochir</topic><topic>PLAINE D'INONDATION</topic><topic>Vertebrates: anatomy and physiology, studies on body, several organs or systems</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Booth, A.J. (Rhodes Univ., Grahamstown (South Africa). 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Samples were collected from sites which receive flood waters between May and August. Marginal zone analysis showed that an annulus was formed between October and December during the dry, summer period. Maximum age estimates of eleven years were obtained and growth was described by the 3 parameter von Bertalanffy model as l sub(t) = 215.24(1-e super(-0.42(t+1.08))) mm SL.</abstract><cop>Dordrecht</cop><pub>Springer</pub><doi>10.1007/BF00018674</doi><tpages>6</tpages></addata></record> |
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| language | eng |
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| subjects | AGE Biological and medical sciences BOTSWANA CRECIDA CRECIMIENTO CROISSANCE CRUE Development. Metamorphosis. Moult. Ageing EDAD FLOOD PLAINS Freshwater Fundamental and applied biological sciences. Psychology GROWTH HIGH WATER LLANURA ALUVIAL OREOCHROMIS Oreochromis macrochir PLAINE D'INONDATION Vertebrates: anatomy and physiology, studies on body, several organs or systems |
| title | The age and growth of the greenhead tilapia Oreochromis macrochir (Pisces: Cichlidae) from the Okavango Delta, Botswana |
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