Specific diversification in Greek finfish mariculture Kentouri M., Papandroulakis N., Divanach P. Aspects économiques de la production aquacole Zaragoza : CIHEAM Cahiers Options Méditerranéennes; n. 14 1995

Aspects économiques de la production aquacole Zaragoza : CIHEAM

Cahiers Options Méditerranéennes; n. 14 1995

pages 129-136

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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

-

of

development of it allows the to

to fish (Thunnus

dumerilli) and to fish pagrus, Dentex dentex,

puntazzo, Spondyliosoma cantharus Diplodus sargus,

is yet unknown.

words ^:

-

-

la les

au développement exponentiel de. et la

les aux poissons

à celles. à

spécialement discutees.

à l’échelle pilote mais l’état des

:

As in the development of in

followed a classical scheme with i) a difficult phase with high demand and

ii) an with high benefit and iii) a difficult

phase of of demand (Stefanis J.,

1993).

The cost and the key of

of be

analysed in with like the of the

Like economy, the benefit, i.e. the of an and

the induced socio economical and by the following

equation:

the the the the

simple:

of

which will lead to

a of the

Second the of the

solution which need sophisticated methods of and of the

of the / of the

the case of the methods exist. One of the most

is the of the

NEW

The of the with new species which by 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 of the needs of the

The the of the species (easy adaptation, endemic

species, etc.). Following the analysis of showing also

the in

a. Small fishes

consumption, and

at a size of 10 - 20 fish with a of about 2,000

kilo. classical conditions and weaning

phase) the cost individual is about 25 to 50 to a

cost of than 3,000 the

Only bate fishes with high individual economically

like in this case (exotic

species

b. Species with

case the fishes which due to high

valued like the some of

is at 20,000 kilo. The

the local lagoon is about 3,000

extensive conditions with a of the local a sex of about 2 and a gonadosomatic index of 30%, the of kilo is about 4,000 making it a good candidate

intensive the of the sex and on

c. Flatfish

Flatfishes potential of fishes. The sole (Solea

solea) a

in lagoon zones et N., et al., 1987;

J., 1981). The existence of such in the

of such a

is an

& 1989; FAUVEL C., et al., 1993; J., et al,

1991; J., 1993). of medium (15

-

"C) make the adaptation difficult in to the high

with a of 17 - 19 "C can be species

consists of of the

and anguillidae (eel), phase. The

existence in of with an exploitation

of of is needed

of to the high of sea

sea bass, the choice of new species was limited to the ones of

like common dentex and

white head sea the in

small scale in the et al., 1989; 1980;

p.,

al.

al,

al.,

C., 1987).

With the of 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 of man like

which by themselves into the cages, due to the elimination of the cost. This of species

with the seabass (Fig 1).

the species discussed above must still to be

no of the cycle,

with difficulties in the a well

A with

cost is influenced by time-dependent cost,

with the adapted to

such a

in a et al. 1993; et

al.,

1989 1993; 1985) and also species like the

some Epinephelus sp. which

weight of 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.,

A., 1992; LAVETT 1961)

to date even limited than the

one. of them well adapted to captivity but is no of

cycle and in the

1980; A. & 1983; F. &

species available in due to of adults individuals.

AS

The scientific knowledge constitutes the limiting the development of

any of the above Like seabass and sea the

seventies and eighties, the the successful of new

is the lack of the of the

cycle specially in the field of the Fig. 2 and

3 the succesion of the bass and sea found in the

data base ASFA giving an indication of the the level

of knowledge and the

to the above mentioned species,

in the data base ASFA 1975 to 1994) the of and the

of the ones to has been noted. this data is as a level of knowledge, it shows that all the species which

the

Epinephelus sp.) a

than 100 exist, of which than 50 % to 1). On the

the new species both these

the mean of the an

lack of knowledge and at the same time the need of

The today have two i.e. genetic

vs. new species. the of the seabass

and sea (small and almost should be

in applied. The gained

like the salmonidae will help in the avoidance of

of the state in the

and the the to

which will allow the of

(Selected)

G., 1974

-

4, 363-367.

G., 1976 - CNEXO - USTL n”76-1479)

-

& T.W., 1993 - A of

S.E., & 1993 - of

N“ 19, p.313 1980 -

du Sud tunisien. 4(2), 215-229.

& Y., 1983

-

species of

F. & A., 1992 - Effets de

suma L.) en p. 7.

E., S., A. &

1989 - Collection of of -

A in

& 1989 - of

L.) and Sole (Solea solea L.) - A biotechnology in

E. N. Wilkins (Eds), EAS, 632-637.

J.C., N. & LETTY Y., 1987

-

G., A. 1992.

du et du en

33 384.

S., 1994. food

in common dentex 7(4): in

J., 1981-1982(b) - de juveniles de sole (Solea solea) en conditions intensives. Le J., 1981-1982(b)

-

Techniques de 1 et 3

FAUVEL C., C., G. & SUQUET 1993 - La

: aspects La

J. & 1992 - of

efficiency in youngs of 16(3),

GASSET E., 1985 - des de la C-

et du seabass de et et

E.

J. & l., 1989 -

of 77, 75-84.

& 1992 - the catch of the

in the gulf of 16(3), p.

S., S., & GENOVESE L., 1992 -

16(3),

S., S. & GENOVESE L., 1993 -

feeding of G.

18.

in : of of (Ed.),

77-82.

& 1977 - of dolphin,

in 12, 115-122.

1993

-

- 19,

& 1992 -

of of

conditions in ⁱⁿ the use of 16(3), p. 14

in 66, 125-147.

23-39.

J., J. & J., 1991 -

G . , 1992.

du du en

Comm. int. 33 385.

& CANTOU 1979 -

la et la Cons. Gén.

33-51.

S., 1989 - status of the potential the

Advances in - 1989. Aquacop

de Colloque 9, 445-459.

1961 - Synopsis of biological of

the

A. & G., 1989 - the

1810) in :

-

V., S. & 1993 - Aspects of the

biology of the 1810). - EAS Special

no 19, p. 413

1980

-

de 21, 116 p.

& E.O., 1993 - of

EAS

& E.O., 1989 - of juvenil

dolphins 20(4), 104-

105.

S., & 1992

-

in 16(3), p.

C., 1987 - de ( L. et sans

de plancton. 14, 5-14.

198 - : of life of

J. of status

and potentials EAS

750

500

250

O

1975 1980 1985 1990

~~

Figure 2. Evolution of the number of references for seabass in the ASFA data base

I

l= Seabass

'Ooo

T '

I

Figure 3. Evolution of the number of references for seabream in the S F A data base

120