Allometric growth and development of organs in ballan wrasse (Labrus bergylta Ascanius, 1767) larvae in relation to different live prey diets and growth rates
Small fish larvae grow allometrically, but little is known about how this growth pattern may be affected by different growth rates and early diet quality. The present study investigates how different growth rates, caused by start-feeding with copepods or rotifers the first 30 days post-hatch (dph),...
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| Format: | Article |
| Language: | English |
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The Company of Biologists
2016-09-01
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| Series: | Biology Open |
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| Online Access: | http://bio.biologists.org/content/5/9/1241 |
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| author | Maren Ranheim Gagnat Per-Arvid Wold Tora Bardal Gunvor Øie Elin Kjørsvik |
| author_facet | Maren Ranheim Gagnat Per-Arvid Wold Tora Bardal Gunvor Øie Elin Kjørsvik |
| author_sort | Maren Ranheim Gagnat |
| collection | DOAJ |
| description | Small fish larvae grow allometrically, but little is known about how this growth pattern may be affected by different growth rates and early diet quality. The present study investigates how different growth rates, caused by start-feeding with copepods or rotifers the first 30 days post-hatch (dph), affect allometric growth and development of nine major organs in ballan wrasse (Labrus bergylta) larvae up to experimental end at 60 dph. Feeding with cultivated copepod nauplii led to both increased larval somatic growth and faster development and growth of organ systems than feeding with rotifers. Of the organs studied, the digestive and respiratory organs increased the most in size between 4 and 8 dph, having a daily specific growth rate (SGR) between 30 and 40% in larvae fed copepods compared with 20% or less for rotifer-fed larvae. Muscle growth was prioritised from flexion stage and onwards, with a daily SGR close to 30% between 21 and 33 dph regardless of treatment. All larvae demonstrated a positive linear correlation between larval standard length (SL) and increase in total tissue volume, and no difference in allometric growth pattern was found between the larval treatments. A change from positive allometric to isometric growth was observed at a SL close to 6.0 mm, a sign associated with the start of metamorphosis. This was also where the larvae reached postflexion stage, and was accompanied by a change in growth pattern for most of the major organ systems. The first sign of a developing hepatopancreas was, however, first observed in the largest larva (17.4 mm SL, 55 dph), indicating that the metamorphosis in ballan wrasse is a gradual process lasting from 6.0 to at least 15-17 mm SL. |
| first_indexed | 2024-12-19T09:21:21Z |
| format | Article |
| id | doaj.art-f6b973a4245f477d8ba7c560a6bd37bb |
| institution | Directory Open Access Journal |
| issn | 2046-6390 |
| language | English |
| last_indexed | 2024-12-19T09:21:21Z |
| publishDate | 2016-09-01 |
| publisher | The Company of Biologists |
| record_format | Article |
| series | Biology Open |
| spelling | doaj.art-f6b973a4245f477d8ba7c560a6bd37bb2022-12-21T20:27:58ZengThe Company of BiologistsBiology Open2046-63902016-09-01591241125110.1242/bio.017418017418Allometric growth and development of organs in ballan wrasse (Labrus bergylta Ascanius, 1767) larvae in relation to different live prey diets and growth ratesMaren Ranheim Gagnat0Per-Arvid Wold1Tora Bardal2Gunvor Øie3Elin Kjørsvik4 Norwegian University of Science and Technology (NTNU), Dept. of Biology, Center for Fisheries and Aquaculture, Trondheim N-7491, Norway Norwegian University of Science and Technology (NTNU), Dept. of Biology, Center for Fisheries and Aquaculture, Trondheim N-7491, Norway Norwegian University of Science and Technology (NTNU), Dept. of Biology, Center for Fisheries and Aquaculture, Trondheim N-7491, Norway SINTEF Fisheries & Aquaculture, Dept. of Marine Resources Technology, Trondheim N-7465, Norway Norwegian University of Science and Technology (NTNU), Dept. of Biology, Center for Fisheries and Aquaculture, Trondheim N-7491, Norway Small fish larvae grow allometrically, but little is known about how this growth pattern may be affected by different growth rates and early diet quality. The present study investigates how different growth rates, caused by start-feeding with copepods or rotifers the first 30 days post-hatch (dph), affect allometric growth and development of nine major organs in ballan wrasse (Labrus bergylta) larvae up to experimental end at 60 dph. Feeding with cultivated copepod nauplii led to both increased larval somatic growth and faster development and growth of organ systems than feeding with rotifers. Of the organs studied, the digestive and respiratory organs increased the most in size between 4 and 8 dph, having a daily specific growth rate (SGR) between 30 and 40% in larvae fed copepods compared with 20% or less for rotifer-fed larvae. Muscle growth was prioritised from flexion stage and onwards, with a daily SGR close to 30% between 21 and 33 dph regardless of treatment. All larvae demonstrated a positive linear correlation between larval standard length (SL) and increase in total tissue volume, and no difference in allometric growth pattern was found between the larval treatments. A change from positive allometric to isometric growth was observed at a SL close to 6.0 mm, a sign associated with the start of metamorphosis. This was also where the larvae reached postflexion stage, and was accompanied by a change in growth pattern for most of the major organ systems. The first sign of a developing hepatopancreas was, however, first observed in the largest larva (17.4 mm SL, 55 dph), indicating that the metamorphosis in ballan wrasse is a gradual process lasting from 6.0 to at least 15-17 mm SL.http://bio.biologists.org/content/5/9/1241Ballan wrasseLabrus bergyltaAllometric growthLarval growthOrgan developmentStart feeding |
| spellingShingle | Maren Ranheim Gagnat Per-Arvid Wold Tora Bardal Gunvor Øie Elin Kjørsvik Allometric growth and development of organs in ballan wrasse (Labrus bergylta Ascanius, 1767) larvae in relation to different live prey diets and growth rates Biology Open Ballan wrasse Labrus bergylta Allometric growth Larval growth Organ development Start feeding |
| title | Allometric growth and development of organs in ballan wrasse (Labrus bergylta Ascanius, 1767) larvae in relation to different live prey diets and growth rates |
| title_full | Allometric growth and development of organs in ballan wrasse (Labrus bergylta Ascanius, 1767) larvae in relation to different live prey diets and growth rates |
| title_fullStr | Allometric growth and development of organs in ballan wrasse (Labrus bergylta Ascanius, 1767) larvae in relation to different live prey diets and growth rates |
| title_full_unstemmed | Allometric growth and development of organs in ballan wrasse (Labrus bergylta Ascanius, 1767) larvae in relation to different live prey diets and growth rates |
| title_short | Allometric growth and development of organs in ballan wrasse (Labrus bergylta Ascanius, 1767) larvae in relation to different live prey diets and growth rates |
| title_sort | allometric growth and development of organs in ballan wrasse labrus bergylta ascanius 1767 larvae in relation to different live prey diets and growth rates |
| topic | Ballan wrasse Labrus bergylta Allometric growth Larval growth Organ development Start feeding |
| url | http://bio.biologists.org/content/5/9/1241 |
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