Specific diversification in Greek finfish mariculture

Transcription

1 Specific diversification in Greek finfish mariculture Kentouri M., Papandroulakis N., Divanach P. Aspects économiques de la production aquacole Zaragoza : CIHEAM Cahiers Options Méditerranéennes; n pages Article available on line / Article disponible en ligne à l adresse : To cite this article / Pour citer cet article Kentouri M., Papandroulakis N., Divanach P. Specific diversification in Greek finfish mariculture. Aspects économiques de la production aquacole. Zaragoza : CIHEAM, p (Cahiers Options Méditerranéennes; n. 14)

2 Specific diversification in Greek finfish N. PAl?4NDR6LJMK1S1~2 INSTITUTE OF MARINE BIOLOGY OF CRETE IRAKLIO, CRETE GREECE DEPARTMENT BIOLOGY UNIVERSITY OF CRETE IRAKLIO, CRETE GREECE - & development it allows the to to fish (Thunnus dumerilli) and to fish pagrus, Dentexdentex, puntazzo, Spondyliosoma cantharus Diplodus sargus, words : is yet unknown. - La de - la les au développement exponentiel de. et la les aux poissons à celles. à spécialement discutees. à l échelle pilote mais l état des : 129

3 As in the development in followed a classical scheme with i) a difficult phase with high demand and ii) an with high benefit and iii) a difficult phase demand (Stefanis J., 1993). The cost and the key be analysed in with like the Like economy, the benefit, i.e. the an and the induced socio economical and by the following equation: the the the the a Second the simple: which will lead to solution which need sophisticated methods and / the case is the methods exist. One most NEW The with new species whichby definition the is an have to be selected both limitations economical and which should be analysed in these case is the size / fish / kilo taking into the cost needs The the species (easy adaptation, endemic species, etc.). Following the analysis showing also the in a. Small fishes consumption, and at a size fish with a about 2,000 kilo. classical conditions and weaning phase) the cost individualis about 25 to 50 to a cost than 3,000 the Only bate fisheswithhigh individual economically like in this case (exotic species b. Species with case the fisheswhich due to high valued like the some is at 20,000 kilo. The the local lagoon is about 3,000 extensive conditions with a local a sex about 2 and a gonadosomatic index 30%, the kilo is about 4,000 making it a good candidate intensive the sex and on sex is needed. 130

4 c. Flatfish Flatfishes potential fishes.the sole (Solea solea) a in lagoon zones et N., et al., 1987; J., 1981). The existence such in the such a is an & 1989; FAUVEL C., et al., 1993; J., et al, 1991; J., 1993). medium (15-20 "C) make the adaptation difficult in to the high with a "C can be species consists and anguillidae (eel), phase. The existence in with an exploitation is needed to the high sea sea bass, the choice new species was limited to the ones like common dentex and white head sea the in small scale in the et al., 1989; 1980; p., et al. 1992; S., et al, 1994; et al., 1992; al., 1979; et al., 1992; C., 1987). With the as potential in mainly due to One includes some species with the sea the black sea (Spondvliosoma which clean in mixed with in a which man by themselves into the like cages, due to the elimination cost. This species with the seabass (Fig 1). the species discussed above must still to be no cycle, with difficulties in the a well A with cost isinfluencedby time-dependent cost, with the adapted to such a in a et al. 1993; et al., ; 1985) and also species like the some Epinephelus sp. which weight 1.5 a (Fig. 2). G., A., et al., 1989; et al., 1992; & 1992; S., et al., 1992; S., et al., 1993; A. & G., 1989; et al., 1993; S., et al., 1992; G., 1974; 1980; A. & 1983; F. & A., 1992; LAVETT 1961) to date even limited than the one. m well adapted to captivity but is no cycleand in the 131

5 species available in due to adults individuals. AS The scientific knowledge constitutes the limiting the development any above Like seabass and sea the seventies and eighties, the the successful new is the lack cycle specially in the field Fig. 2 and 3 the succesion bass and sea found in the data base ASFA giving an indication the level knowledge and the to the above mentioned species, in the data base ASFA 1975 to 1994) the and the ones to has been noted. this data is as a level knowledge,it shows that all the species which the Epinephelus sp.) a than 100 exist, which than 50 % to 1). On the the new species both these the mean an lack knowledge and at the same time the need The today have two i.e. genetic vs. new species. the seabass and sea (small and almost should be in applied. The gained like the salmonidae will help in the avoidance state in the and the the to which will allow the 132

6 (Selected) G., La du sisas : de 4, G., CNEXO - USTL n ) - Station de & T.W., A S.E., & N 19, p du Sud tunisien. 4(2), & Y., the species F. & A., Effets de suma L.) en p. 7. E., S., A. & Collection - A in & L.) and Sole (Solea solea L.) - A biotechnology in E. N. Wilkins (Eds), EAS, J.C., N. & LETTY Y., Spawning sole in 66, à la connaissance de la biologie et de de : G., A du et du en S., food in common dentex 7(4): in J., (b) - de juveniles de sole (Solea solea) en conditions intensives. Le J., (b) - de juvéniles de sole (Solea solea) en conditions intensives - Techniques de 1 et 3 FAUVEL C., C., G. & SUQUET La : aspects La J. & efficiency in youngs 16(3), GASSETE., des de la C- et du seabass de et et E. J. & l., , & the catch in the gulf 16(3), p. S., S., & GENOVESEL., (3), S., S. & GENOVESE L., feeding G. 18. J., J. & J., in : (Ed.), & dolphin, in 12, , & conditions in in the use 16(3), p

7 Comm. int G., du du en & CANTOU la et la Cons. Gén S., status potential the Advances in Aquacop de Colloque 9, Synopsis biological the A. & G., the 1810) in : - A in V., S. & Aspects biology 1810). - EAS Special no 19, p et de de la de 21, 116 p. & E.O., EAS & E.O., juvenil dolphins 20(4), S., & in 16(3), p. C., de ( L. et sans de plancton. 14, : life J. status and potentials EAS

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9 ~~ Figure 2. Evolution number references for seabass in the ASFA data base 'Ooo T ' -Seabass&Aquaculture l= Seabass I 250 O I Figure 3. Evolution number references for seabream in the SFA data base 120