Repository logo
 
Publication

Effect of increased rearing temperature on digestive function in cobia early juvenile

2019Journal article Open access
Simple item page
dc.contributor.authorYúfera, M.
dc.contributor.authorNguyen, M.V.
dc.contributor.authorNavarro-Guillén, Carmen
dc.contributor.authorMoyano, F.J.
dc.contributor.authorJordal, A.-E.O.
dc.contributor.authorEspe, M.
dc.contributor.authorConceição, L.E.C.
dc.contributor.authorEngrola, Sofia
dc.contributor.authorLe, M.H.
dc.contributor.authorRønnestad, I.
dc.date.accessioned2020-08-04T13:03:39Z
dc.date.available2020-08-04T13:03:39Z
dc.date.issued2019
dc.description.abstractThe present study is focused to elucidate the main characteristics of the digestive function of this carnivorous fast-growing fish living at high temperatures. With this aim, we have examined the effects of an increased temperature from 30 to 34 °C on the daily pattern of gastrointestinal pH, enzymatic proteolytic digestive activity and the feed transit time in early juveniles of cobia (Rachycentron canadum), a species living in tropical and subtropical waters with an increasing aquaculture production. Fish were fed two meals a day. Gastric luminal pH was permanently acidic (mean pH values: 2.76-4.74) while the intestinal pH increased from neutral/slightly acidic to slightly alkaline when the digesta was present, with an increasing alkalinity from proximal to distal intestine (mean pH values: 6.05 to 7.69). The temperature did not affect the gastric pH but a slightly higher acidity was induced in the intestine at 34 °C. Pepsin activity showed a daily rhythm at 30 °C with maximum in the middle of the light period, while at 34 °C some hourly changes coinciding with feed adding without a clear daily trend during the 24-h period were observed. The trypsin activity exhibited a daily rhythm at both temperatures with an increase after morning feeding to reach a maximum several hours later. Average pepsin activity during the daily cycle was slightly higher at 34 °C (6.1 and 7.3 U mg-1 BW at 30 and 34 °C respectively), but values were significantly different only at 8 and 24 h after the morning meal. Similarly, the trypsin activity was significantly affected by the temperature only at 8 and 16 h after the morning meal, but daily activity averages were similar (1.20 and 1.29 U g-1 BW at 30 and 34 °C respectively). The partial transit rates of the first meal in the stomach for each period inter-samplings were higher during the first 4-h period and decreased progressively along the rest of the 24-h cycle at both temperatures, but no significant differences were detected at 30 °C. In addition, the transit was notably faster at 34 °C particularly during the first 8 h after feeding, with rates between 100 and 65% of total volume displaced (intake or released) during each 4-h period. In the intestine the transit rate was relatively constant and similar at both temperatures during 12 h after feeding. Then the rates remained very low during the following 12 h. Residence time of the first meal was longer at 30 than at 34 °C, particularly in the stomach (12 h:02 min vs 4 h:54 min respectively). In the intestine the difference was not so large (8 h:18 min vs 6 h:24 min respectively). In a parallel study under same conditions, cobia reared at 30 °C grew faster and showed a more favorable feed conversion ratio than those at elevated temperature (34 °C). The present results indicate that at 34 °C, a subtle increase of proteolytic activity cannot compensate for the faster gut transit rate. Therefore, 30 °C is more appropriate temperature for the early on-growing of cobia because at higher temperatures the digestion efficiency decrease being one of the causes for a lower growth.pt_PT
dc.description.sponsorshipAgência financiadora European Union (EU) 691150 MINECO, Spain + FEDER/ERDF contribution EFISHDIGESTAGL2014-52888 European Social Fund, the Operational Programme Human Potential IF/00482/2014/CP1217/CT0005 Portuguese Foundation for Science and Technology Portuguese Foundation for Science and Technology UDI/Multi/04326/2013 Norwegian Agency for Development Cooperation NORHED QZA-0485 SRV-13/0010pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.cbpa.2019.01.007pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.1/14594
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationImproving sustainability and performance of aquafeeds
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectAnimalspt_PT
dc.subjectAquaculturept_PT
dc.subjectFishespt_PT
dc.subjectGastrointestinal Transitpt_PT
dc.subjectHumanspt_PT
dc.subjectHydrogen-Ion Concentrationpt_PT
dc.subjectDigestionpt_PT
dc.subjectHot Temperaturept_PT
dc.titleEffect of increased rearing temperature on digestive function in cobia early juvenilept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleImproving sustainability and performance of aquafeeds
oaire.awardURIinfo:eu-repo/grantAgreement/EC/H2020/691150/EU
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F04326%2F2013/PT
oaire.citation.endPage80pt_PT
oaire.citation.startPage71pt_PT
oaire.citation.titleComparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiologypt_PT
oaire.citation.volume230pt_PT
oaire.fundingStreamH2020
oaire.fundingStream5876
person.familyNameNavarro-Guillén
person.familyNameEngrola
person.givenNameCarmen
person.givenNameSofia
person.identifier237846
person.identifier.ciencia-id281B-5543-D0F3
person.identifier.ciencia-idA610-29E7-9B83
person.identifier.orcid0000-0001-5490-0328
person.identifier.orcid0000-0002-5244-5541
person.identifier.ridA-2485-2012
person.identifier.scopus-author-id55901593400
person.identifier.scopus-author-id8669620600
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameEuropean Commission
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication84423569-1ee0-4ed5-8e95-d5ae51008cd3
relation.isAuthorOfPublication51be5a20-df9c-4a90-85eb-51d779642caa
relation.isAuthorOfPublication.latestForDiscovery51be5a20-df9c-4a90-85eb-51d779642caa
relation.isProjectOfPublication8855fa9e-7e45-4491-9cb0-5a2b495fed47
relation.isProjectOfPublication868b4818-3efa-4edb-9202-c464d64fd38f
relation.isProjectOfPublication.latestForDiscovery8855fa9e-7e45-4491-9cb0-5a2b495fed47

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Yufera+Accepted+version.pdf
Size:
1.52 MB
Format:
Adobe Portable Document Format
Download

Collections

CCM2-Artigos (em revistas ou actas indexadas)