Some aspects of the biology and ecology of the goby Knipowitschia caucasica were studied over a period of 13 months in a poly-to euhaline area in the Evros Delta (North

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Fishculture has been flourishing during the last decades in Greece and EU. Many enterprises in fishfarming sector have already proceeded in employing ecommerce and they have created their websites. This paper aims to assess websites of commercial purpose within fishculture sector and identify their optimum group. As a case study it was selected the paradigm of Greece. Qualitative and quantitative content characteristics were identified in the retrieved websites that were further ranked according to 13 content characteristics/criteria using the multicriteria method of PROMETHEE II. Finally, the retrieved websites were classified in groups, aiming to identify the optimum group of websites concerning content characteristics. The optimum group of fishculture websites will be a useful standard while designing for a fish culture enterprise aiming to initially or further expand their e-commerce activities.

The roach, Rutilus rutilus, is a Cyprinid which is widely distributed throughout freshwater systems in Europe. It is one of the most abundant and important commercial fish species in Greece. Age, growth, reproduction and fecundity of roach were studied in Lake Volvi from 1997-1998 females had higher growth in length (L∞=277.18 mm, k=0.097) than adult males (L∞=185.60 mm, k=0.148). All males older than one year and larger than 70 mm, and all females older than two years and larger than 80 mm were sexually mature. The breeding period spanned from the end of March till mid April. Fecundity ranged from 2,036 to 31,653 eggs (mean 8,102 eggs) and relative fecundity from 76.06 to 333.94 eggs/g (mean 186.78 eggs/g). Diameter of eggs were 1.3 ± 0.07 mm and weighted 0.0011 ± 0.0002 g . The weight of eggs were independent of length and age of individuals (P>0.05), however, there was a significant relationship between weight and egg diameter (P<0.05). Absolute fecundity depended on length, weight and age of the females. The relationship between absolute fecundity and length were less obvious in the case of relative fecundity and egg size. Estimated growth was at the lower end when compared with other studies conducted elsewhere.