Naslov
Some biological parameters of the Mediterranean sand smelt Atherina (Atherina) hepsetus, Linnaeus, 1758 (Pisces: Atherinidae) from the middle eastern Adriatic (Croatian coast)

Autori
Pallaoro, Armin ; Dulčić, Jakov ; Jardas, Ivan ; Kraljević, Miro

Izvornik
Journal of Applied Ichthyology (0175-8659) 23 (2007), 2; 189-192

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Atherina hepsetus; age; growth; mortality; length-weight relationship; Adriatic

Sažetak
Data on the length-weight relationship, age, growth, sex ratio and mortality were analysed for the Mediterranean sand smelt, Atherina (Atherina) hepsetus L. (total = 2805 ; males = 1258 ; females = 1547) collected in the eastern middle Adriatic island area during the reproductive period (February to April) in 2002. The total length of sampled specimens ranged from 3.8 to 14.5 cm and the weight from 0.28 to 22.39 g. The overall sex ratio was 1.23 : 1 in favour of females, significantly different from the expected 1 : 1 ratio (&#967; 2 = 29.76 ; P < 0.05). All individuals >13.4 cm were females. The oldest collected male and female specimens were 5 years old. The von Bertalanffy growth formula was estimated for females (L = 15.79 (1-e0.43(t+0.049)) and males (L = 15.25 (1-e0.43(t+0.018)). The power values (b) of the length-weight relationship were very similar for both sexes (b = 3.14) and indicated a slightly allometric growth. The instantaneous rates of mortality for all collected fish were Z = 1.44 year1 ; M = 0.94 year1 and F = 0.50 year1. The exploitation ratio was E = F/Z = 0.35. The value for M is highly uncertain, however, as well as those values for F and E.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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