Original scientific paper
Recruitment Characteristics of Juvenile Salema, Sarpa Salpa (Linnaeus, 1758), in Donji Molunat Bay, Southeastern Adriatic Coast, Croatia
Tatjana Dobroslavić
Vlasta Bartulović
orcid.org/0000-0001-7450-3741
; Sveučilište u Dubrovniku
Davor Lučić
; Institut za more i priobalje, Sveučilište u Dubrovniku
Sanja Tomšić
; Sveučilište u Dubrovniku
Branko Glamuzina
; Sveučilište u Dubrovniku
Abstract
In this paper the recruitment characteristics of salema juveniles Sarpa salpa (Linnaeus, 1758) from the Donji Molunat Bay are described. Samples were collected monthly, from March to July in 2009 with a costal demersal net. During the experimental period, 319 juveniles were analyzed. The following parameters were studied; length-weight relationship, frequency of pray, percentage of pray and percentage of empty stomachs. The recorded values of total length in analyzed juveniles ranged from 2,2 to 6,0 cm, and growth expressed positive alometry. Salema juveniles (total length from 3,1 do 6,0 cm) fed on plant material during March and June. During May (total length from 2,0 to 3,0 cm), juveniles fed on zooplankton. Dominated zooplanktonic food were copepods, shares in the total amount of prey were: Calanoida (87,24%), Cyclopoida (5,13%), Harpaticoida (3,33%), Poecilostomatoida (1,52%). The other groups of prey shared less then 1%: decapods larvae, ostracods, cladocerans, juvenile gammarids and bivalve larvae. The most frequent copepods found in stomachs of fish were calonoids (100%), cyclopoids (46,67%), and poecilostomatoids (16,33%). The frequency of other groups of prey was less then 10%. Zooplanktonic diet changed with the plant material when the juveniles reached a body length from 2,9 to 3,2 cm. Empty stomachs were not found.
Keywords
salema juveniles; Sarpa salpa; Donji Molunat bay; length-weight relationship; diet; recruitment
Hrčak ID:
59585
URI
Publication date:
18.10.2010.
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