Athanassios Machias

Athanassios Machias

Research Director

Tel: +30-210-9856702
Fax: +30-210-9811713

Short CV

  • BSc in Biology, School of Biology, National and Kapodistrian University of Athens (1983)
  • MSc in Marine Biology, University of Crete (1989)
  • PhD in the School of Biology, University of Crete (1994)

Dr. Athanassios Machias has been working as a research scientist at HCMR since 1994, during which he has acquired a broad range of experience as a fisheries biologist. His present position is Director of Research of the Institute of Marine Biological Resources and Inland Waters (HCMR).He earned his doctoral and master’s degrees in Marine Biology from the Biology Department, University of Crete, Greece.

He holds a bachelor’s degree in Biology from the Kapodistrian University of Athens, Greece. He has completed his doctoral training in the Fisheries Biology group at the Biology Department of the University of Crete.

His thesis work focused on the anatomical and biological factors affecting the Target Strength of sardine.He has been involved in a wide range of fisheries projects. He has coordinated a series of European projects on the discards and the discarding procedure of professional trawlers of Eastern and Central Mediterranean Sea, publishing several papers on this issue for the specific area. In addition, he has investigated the interaction between fisheries and aquaculture with this work  published in a series of scientific papers, and indicated the positive effect of aquaculture to the fish production in the oligotrophic waters, such as those of the Eastern Mediterranean Sea.

He is also responsible for the Greek Fisheries Data Collection in the framework of the Data Collection Framework.He has also coordinated or was involved in several projects for the estimation of small pelagic fish stocks biomass by means of acoustics. He is an active member of the stock assessment study groups in the Mediterranean region i.e. GFCM, FAO-EastMed, facilitator of MEDIAS (pan-Mediterranean Acoustic Surveys) in the framework of Data Collection Framework (2008-2011), providing Management plans and advice to the Greek government.

Up to now he has supervise(d)s 22 MSc and co-supervise(d)s 3 PhD theses. He has research interests mainly on the Fisheries Ecology scientific field, including physical/biological interactions in marine ecosystems, fish discards research, interaction between fisheries and aquaculture, fisheries acoustics, small pelagic fish behaviour and population dynamics, stock assessment modelling, essential fish habitat determination and ecosystem based modelling.

He intends to focus his future research on the assessment of climate and anthropogenic impacts on marine ecosystems and the essential fish habitat, focusing particularly on the interactions between small pelagic populations and climate change.He has participated in more than 40 national and international projects and coordinated 18 European Union (EU) and national projects.

He has contributed 54 papers in peer-reviewed journals, written 4 book chapters, as well as more than 120 other publications (i.e., conference proceedings, special publications, newspaper and magazine articles) and co-authored 30 technical reports.


  • Giannoulaki M, Iglesias M, Tugores MP, Bonanno A, Patti B, De Felice A, Leonori I, Bigot JL, Tičin AV, Pyrounaki MM, Tsagarakis K, Machias A, Somarakis S, Schismenou E, Quinci E, Basilone G, Cuttitta A, Campanella F, Miquel J, Oñate D, Roos D, Valavanis V (2013) Characterising the potential habitat of European anchovy Engraulis encrasicolus in the Mediterranean Sea at different life stages. Fisheries Oceanography 22:69-89
  • Machias A, Pyrounaki MM, Leonori I, Basilone G, Iglesias M, de Felice A, Bonanno A, Giannoulaki (2013) Catch of pelagic hauls in Mediterranean acoustic surveys: Is it the same between day and night? Scientia Marina 77:69-79
  • Mytilineou Ch, Tsagarakis K, Bekas P, Anastasopoulou A, Kavadas S, Machias A, Haralabous J, Smith CJ, Petrakis G, Dokos J, Kapandagakis A (2013) Spatial distribution and aspects of the life history of blackspot seabream Pagellus bogaraveo (Brünnich 1768) (Osteichtyes: Sparidae) from the Eastern Mediterranean. Journal of Fish Biology 83:1551-1575
  • Somarakis S, Schismenou E, Siapatis A, Giannoulaki M, Kallianiotis A, Machias A (2012) High variability in the Daily Egg Production Method parameters of an eastern Mediterranean anchovy stock: Influence of environmental factors, fish condition and population density. Fisheries Research 117-118:12-21
  • Tsagarakis K, Giannoulaki M, Somarakis S, Machias A (2012) Variability in positional, energetic and morphometric descriptors of European anchovy (Engraulis encrasicolus) schools related to patterns of diurnal vertical migration. Marine Ecology Progress Series 446:243-258
  • Tsagarakis K, Pyrounaki MM, Giannoulaki M, Somarakis S, Machias A (2012) Ontogenetic shift in the schooling behaviour of sardine (Sardina pilchardus). Animal Behaviour 84:437-443
  • Tsagarakis K, Vassilopoulou V, Kallianiotis A, Machias A (2012) Discards of the purse seine fishery targeting small pelagic fish in the eastern Mediterranean Sea. Scientia Marina 76:561-572
  • Antonakakis K, Giannoulaki M, MachiasA, Somarakis S, Sanchez S, Ibaibarriaga L, Uriarte A (2011) Assessment of the sardine (Sardina pilchardus Walbaum, 1792) fishery in the eastern Mediterraanean basin (north Aegean Sea). Mediterranean Marine Science 12:333-357
  • Giannoulaki M, Pyrounaki MM, Liorzou B, Leonori I, Valavanis DV, Tsagarakis K, Bigot JL, Roos D, De Felice A, Campanella F, Somarakis S, Arneri E,Machias A (2011) Habitat suitability modelling for sardine (Sardina pilchardus) juveniles in the Mediterranean Sea. Fisheries Oceanography 20:367-382
  • Nikolioudakis N, Palomera I, Machias A, Somarakis S (2011) Diel feeding intensity and daily ration of the sardine Sardina pilchardus. Marine Ecology Progress Series 437:215-228
  • Somarakis S, Isari S, Machias A (2011) Larval fish assemblages in coastal waters of central Greece: reflections of topographic and oceanographic heterogeneity. Scientia Marina 75:605-618
  • Tugores MP, Giannoulaki M, Iglesias M, Bonanno A, Ticina V, Leonori I, Machias A, Tsagarakis K, DIaz N, Giraldez A, Patti B, De Felice A, Basilone G, Valavanis V (2011) Habitat suitability modeling for sardine (Sardina pilchardus) in a highly diverse ecosystem: the Mediterranean Sea. Marine Ecology Progress Series 443:181-205
  • Tsagarakis K, Coll M, Giannoulaki M, Somarakis S, Papaconstantinou C, Machias A (2010) Food-web traits of the north Aegean Sea ecosystem (eastern Mediterranean, Greece) and comparison with other Mediterranean ecosystems. Estuarine, Coastal and Shelf Science 88:233-248
  • Giannoulaki M, Valavanis VD, Palialexis A, Tsagarakis K, Machias A, Somarakis S, Papaconstantinou C (2008) Modelling the presence of anchovy Engraulis encrasicolus in the Aegean Sea during early summer, based on satellite environmental data. Hydrobiologia 612: 225-240
  • Machias A, Stergiou KI, Somarakis S, Karpouzi VS, Kpantagakis A (2008) Trends in trawl and purse seine catch rates in the north-eastern Mediterranean. Mediterranean Marine Science 9:49-65
  • Siapatis A, Giannoulaki M, Valavanis VD, Palialexis A, Schismenou E, Machias A, Somarakis S (2008) Modelling potential habitat of the invasive ctenophore Mnemiopsisleidyi in Aegean Sea. Hydrobiologia 612:281–295
  • Tsagarakis K, Machias A, Giannoulaki M, Somarakis S, Karakassis I (2008) Seasonal and temporal trends in metrics of fish community for otter – trawl discards in a Mediterranean ecosystem. ICES Journal of Marine Science 65:539-550
  • Tsagarakis K, Machias A, Somarakis S, Giannoulaki M, Palialexis A, Papaconstantinou C, Valavanis V (2008) Habitat discrimination of juvenile sardines in the Aegean Sea using remote sensing environmental data. Hydrobiologia 612: 215-223
  • Ganias K, Somarakis S, Machias A, Koutsikopoulos C (2007) Factors affecting the spawning period of sardine in two highly oligotrophic Seas. Marine Biology 151:1559-1569
  • Giannoulaki M, Machias A, Koutsikopoulos C, Somarakis S (2006) The effect of coastal topography on the spatial structure of anchovy and sardine. ICES Journal of Marine Science 63:650-662
  • Karakassis I, Machias A, Pitta P, Papadopoulou KN, Smith CJ, Apostolaki ET, Giannoulaki M, Koutsoubas D, Somarakis S (2006) Cross-community congruence of patterns in a marine ecosystem: Do the parts reflect the whole? Marine Ecology Progress Series 310:47-54
  • Machias A, Giannoulaki M, Somarakis S, Maravelias CD, Neofitou C, Koutsoubas D, Papadopoulou KN, Karakassis I (2006) Fish farming effects on local fisheries landings in oligotrophic seas. Aquaculture 261:809-816
  • Somarakis S, Ganias K, Siapatis A, Koutsikopoulos C, Machias A, Papaconstantinou C (2006) Spawning habitat and daily egg production of sardine in the eastern Mediterranean. Fisheries Oceanography 15:281-292
  • Giannoulaki M, Machias A, Somarakis S, Karakassis I (2005) Wild fish spatial structure in response to presence of fish farms. Journal of Marine Biological Association of the United Kingdom 85:1271-1277
  • Giannoulaki M, Machias A, Somarakis S, Tsimenides N (2005) The spatial distribution of anchovy and sardine in the northern Aegean Sea in relation to hydrographic regimes. Belgian Journal of Zoology 135:151-156
  • Machias A, Karakassis I, Somarakis S, Giannoulaki M, Papadopoulou KN, Smith C (2005) The response of demersal fish communities to the presence of fish farms. Marine Ecology Progress Series 288:241-250
  • Ganias K, Somarakis S, Machias A, Theodorou A (2004) Identifying newly spawned female sardines by means of common fisheries data. Cybium 28:43-46
  • Ganias K, Somarakis S, Machias A, Theodorou A (2004) Pattern of oocyte development and batch fecundity in the Mediterranean sardine. Fisheries Research 67:13-23
  • Giannoulaki M, Machias A, Koutsikopoulos C, Somarakis S, Tsimenides N (2004) Acoustic-geostatistical assessment and habitat-abundance relationships of sardine in the Hellenic Seas. Rapp Comm int Mer Medit 37:363
  • Machias A, Karakassis I, Labropoulou M, Somarakis S, Papadopoulou KN, Papaconstantinou C (2004) Changes in wild fish assemblages after the establishment of a fish farming zone in an oligotrophic marine ecosystem. Estuarine Coastal and Shelf Science 60:771-779
  • Machias A, Maiorano VP, Vassilopoulou V, Tursi A, Papaconstantinou C, Tsimenides N (2004) Discarding length of commercial trawl species in eastern Mediterranean. Fisheries Research66:213-222
  • Machias A, Paiorano P, Vassilopoulou V, Papaconstantinou C, Tursi A, Tsimenidis N (2004) Sizes of discarded commercial species in the eastern-central Mediterranean Sea. Fisheries Research 66:213-222
  • Papandroulakis N, Suquet M, Spedicato MT, Machias A, Fauvel C, Divanach P (2004) Feeding rates, growth performance and gametogenesis of wreckfish (Polyprion americanus) kept in captivity. Aquaculture International 12:395-407
  • Somarakis S, Stamataki C, Machias A, Papadopoulou K, Smith C, Karakassis I (2004) Condition and fecundity of red mullet over muddy and “coralligene” substrata. Rapp. Comm. int. Mer Medit. 37:443
  • Carbonara P, Constantino G, Giovine G, Lembo G, Spedicato MT, Machias A (2003). Some aspects of the life history of Polyprion americanus (Schneider, 1801) along the coasts of the north western Ionian Sea. Biologia Marina Mediterranea 10:102-112
  • Ganias K, Somarakis S, Koutsikopoulos C, Machias A, Theodorou A (2003) Ovarian atresia in the Mediterranean sardine, Sardina pilchardus sardine. Journal of the Marine Biological Association of the United Kingdom 83:1327-1332
  • Ganias K, Somarakis S, Machias A, Theodorou A (2003) Evaluation of spawning frequency in a Mediterranean sardine population. Marine Biology 142:1169-1179
  • Giannoulaki M, Machias A, Koutsikopoulos C, Haralabous J, Somarakis S, Tsimenides N (2003) The effect of coastal topography on the spatial structure of the populations of small pelagic fish.Marine Ecology Progress Series 265:243-253
  • Machias Α, Somarakis S, Papadroulakis Ν, Spedicato M-T, Suquet M, Lembo M, Divanach P (2003) Settlement of the wreckfish (Polyprion americanus). Marine Biology 142:45-52
  • Stergiou KI, Machias A, Somarakis S, Kapantagakis A (2003) Can we define target species in Mediterranean trawl fisheries? Fisheries Research 59:431-435
  • Machias A, Labropoulou M (2002) Intra-specific variation in resource use for the red mullet, Mullus barbatus. Estuarine, Coastal and Shelf Science 55:565-578
  • Machias A, Maraveya E, Pavlidis M, Somarakis S, Divanach P (2002) Validation of annuli on scales and otoliths of common dentex (Dentex dentex). Fisheries Research 54: 287-294
  • Machias A, Maraveyia E, Pavlidis M, Somarakis S, Divanach P (2002) Ring formation on scales and otoliths of common dentex (Dentex dentex). Fisheries Research 54:287-294
  • Somarakis S, Koutsikopoulos C, Machias A, Tsimenides N (2002) Applying the Daily Egg Production Method to small stocks in highly heterogeneous seas. Fisheries Research 55:193-204
  • Somarakis S, Machias A (2002) Age, growth and bathymetric distribution of red pandora (Pagellus erithrinus) on the Cretan shelf (eastern Mediterranean). Journal of the Marine Biological Association of the United Kingdom 82:149-160
  • Ganias K, Somarakis S, Caragitsou E, Koutsikopoulos C, Machias A, Theodorou A (2001). Differential egg production of sardine off the central Hellenic coasts in December 1999. Rapp Comm int Mer Medit 36:268
  • Machias A, Vassilopoulou  V, Vatsos D, Bekas P, Kallianiotis A, Papaconstantinou C, Tsimenides (2001) Bottom trawl discards in the N. E. Mediterranean Sea. Fisheries Research 53:181-195
  • Maraveya E, Somarakis S, Machias A (2001) Batch fecundity of anchovy, Engraulis encrasicolus, in the NE Aegean Sea. Rapp. Comm. int. Mer Medit. 36: 299
  • Giannoulaki M, Machias A, Tsimenides N (1999) Ambient luminance and vertical migration of sardine (Sardina pilchardus). Marine Ecology Progress Series 173:275-288
  • Labropoulou M, Machias A, Tsimenides N (1999) Habitat selection and diet of juvenile red porgy, Pagrus pagrus (Linnaeus, 1758). Fishery Bulletin 97:495-507
  • Labropoulou M, Machias A (1998) Effects of habitat selection on the dietary patterns of two triglids species. Marine Ecology Progress Series 173:275-288
  • Machias A, Somarakis S, Tsimenides N (1998) Bathymetric distribution and movements of red mullet Mullus surmuletus. Marine Ecology Progress Series 166:247-257
  • Machias A, Tsimenides N, Kokokiris L, Divanach P (1998) Ring formation on otoliths and scales of Pagrus pagrus L.(Sparidae): a comparative study. Journal of fish biology 52:350-361
  • Labropoulou M, Machias A, Tsimenides N, Eleftheriou A (1997) Feeding habits and ontogenetic diet shift of the striped red mullet Mullus surmuletus Linnaeus 1758. Fisheries Research 31: 257-267
  • Machias A, Tsimenides N (1996) Anatomical and physiological factors affecting the swimbladder cross-section of sardine Sardina pilchardus W. Canadian Journal of Fisheries and Aquatic Sciences 53:280-287
  • Machias A, Tsimenides N (1995) Biological factors affecting the swimbladder volume of sardine (Sardina pilchardus). Marine Biology 123:59-867
  • Tsimenides N, Machias A, Kallianiotis A (1992) Distribution patterns of triglids, (Pisces: Triglidae), on the Cretan shelf (Greece) and their interspecific associations. Fisheries Research 15:83-103
  • Tsimenides N, Tserpes G, Machias A, Kallianiotis A (1991) Distribution of fishes on the Cretan shelf. Journal of Fish Biology 39:661-672
2020-09-04T13:01:32+03:0013/12/2013|Our people, Researchers|

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