Naslov
The effect of light intesivity on the growth and survival of common dentex Dentex dentex (L., 1758)

Autori
Petani, Bruna ; Čolak, Slavica ; Barić, Renata ; Uhoda, Anđela ; Kolega, Matko ; Mejdandžić, Danijel ; Mustać, Bosiljka ; Župan, Ivan ; Bavčević, Lav ; Šarić, Tomislav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, prošireni sažetak, znanstveni

Izvornik
AQUACULTURE EUROPE 22 / - , 2022, 1016-1017

Skup
AQUACULTURE EUROPE 22

Mjesto i datum
Rimini, Italija, 27.09.2022. - 30.09.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Light intensity ; Dentex dentex ; Aquaculture

Sažetak
Introduction Common dentex (D. dentex) belongs to the family of the Sparidae. It is characterized by rapid growth, high meat quality and it is a very desirable candidate for aquaculture farming (Abellán, 2000). Common dentex rearing in the Republic of Croatia began in the 1990s but was not successfully implemented commercially. The assumption is that low survival rates were present due to inadequate food, breeding conditions and diseases (Efthimiou et al., 1994). One of the most frequent cause of common dentex’s disease and mortality is stress sensitivity (Efthimiou et al., 1994). Due to lack of the data and insufficiently known facts about commercial common dentex breeding, but also the great breeding potential of this species and the economic viability of the product, we focused on studying the impact of abiotic factors that could be useful in the cultivation of this species (Abellán, 2000). The obtained results can expand the knowledge about the effects of abiotic environmental factors on the growth and survival of this species. Furthermore, this „in situ“ experiment investigated how light intensity influence growth and survival of common dentex. Materials and methods The research was conducted in the middle Adriatic at Mala Lamjana fish farm, Bisage breeding site on the south side of the island of Ugljan, Croatia (Figure 1). D.dentex with initial average weight were distributed in four floating cages (9 x 5 x 5 m), 4 000 fish were placed in each cage. (Continued on next page) 1017 Experimental design included two groups of common dentex where the first group was shaded (K1 and K2) and the second group was exposed to natural light (K3 nad K4). Light intensity was measured with digital lux meter once per week, while temperature and oxygen were measured on a daily basis. Biometry samples were taken on a monthly basis and included total length, weight and condition index of the fish. In addition, mortality was controlled three times per week. Results and Discussion The experiment was conducted from January to June 2020. In the period of our research, sea temperatures oscillated from 13 ° C in February to 19 ° C in June when the sea temperature was the highest. Fish reared in cages K1, K2 were under the shade and cages K3, K4 were exposed to sunlight. The month of June showed the greatest improvement in the obtained average weight of all cages, K1 was the smallest, K2 and K3 were in a small difference from each other while K4 got the most on weight. The results we obtained do not confirm that light affects the growth of individuals because there is no statistically significant difference in the total growth of fish farmed under light and shade. Moreover, there is no negative impact of light founded on the fish growth and survival of common dentex exposed to light compared to the group of common dentex that were in the shade. However, these experimental results can be useful for better future selection of aquaculture technology for this new species. References Abellán, E. (2000.) Culture of common dentex (D. dentex L.). Present knowledge, problems and perspectives, 157- 168. ; Efthimiou, S., Divanach, P., & Rosenthal, H. (1994). Growth, food conversion and agonistic behaviour in common dentex (Dentex dentex) juveniles fed on pelleted moist and dry diets. Aquatic Living Resources, 7(4), 267-275.

Izvorni jezik
Engleski

Znanstvena područja
Biotehnologija, Biotehnologija u biomedicini (prirodno područje, biomedicina i zdravstvo, biotehničko područje)

POVEZANOST RADA