February 1st to 5th 2016
Olhão, Portugal
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Marine commercial fish feeding: dietary characterization and food availability of three fish species from a southern European temperate estuary (Mondego estuary, Portugal)

Scientific Exhibition
Natural Resources
Wednesday, February 3, 2016 -
18:30 to 20:00

Vieira, R. 1 Neto, J.M. 2 Barría, P. 3 Marques, L. 4 Marques, J.C. 5 Gonçalves, F. 6 Gonçalves, A.M.M. 7

1Department of Biology and CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
2IMAR & MARE, Department of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
3IMAR & MARE, Department of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
41. Biology Dep.&CESAM,Aveiro Univ.,3810-193 Aveiro,Portugal 2. IMAR & MARE,Dep. of Life Sciences,Coimbra Univ. 3004-517 Coimbra, Portugal
5IMAR & MARE, Department of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
6Department of Biology and CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
71. IMAR & MARE,Dep. of Life Sciences,Coimbra Univ. 3004-517 Coimbra, Portugal 2. Biology Dep.&CESAM,Aveiro Univ.,3810-193 Aveiro, Portugal

The diet composition of three important marine commercial fish species Platichthys ?esus, Solea solea and Dicentrarchus labrax was studied. Sampling was conducted seasonally (spring; summer / autumn), from 2012 to 2014, at six stations located along the saline gradient of the Mondego estuary, Portugal. The work aimed to: 1) characterize the diet of three marine fish species based on the identification of their gut contents; 2) identify possible inter-annual and seasonal food preferences; and 3) determine if the annual interposes to seasonal variations. In 2014 the number of preys in gut contents was much higher than in 2012 and 2013. The stations in the mouth (M) and at downstream areas of south (St 9) and north (St 18) arms are the ones with the higher number of preys in guts. Corophium multisetosum (10.16±0.29) and Streblospio shrubsolii (9.16±0.37) followed by Cyathura carinata (0.42±0.01) and Crangon crangon (0.40±0.01) are the preys most consumed by D. labrax; C. multisetosum (5.32±0.12); Abra alba (3.87±0.13) followed by S. shrubsolii (1.74±0.06) are the most consumed by P. flesus; Cerastoderma edule (2.52±0.08) followed by C. carinata (0.32±0.01) and Carcinus maenas (0.90±0.03) are the most consumed by S. solea. At St M P. flesus and S. solea present a common prey (C. edule) whereas at St 12 D. labrax and S. solea show as common prey C. carinata, while at downstream stations D. labrax and P. flesus show as common prey C. multisetosum. At the south arm overall fish species show as common prey C. maenas. In general, consumption of C. multisetosum by D. labrax and P. flesus does not reveal correlation with prey availability. Still, the consumption of C. crangon by D. labrax, reveals a correlation with prey availability, showing a feeding preference.
keywords: 
Commercial marine fish species, Preys, Gut contents, Feeding, Mondego estuary

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