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KONDICIONI INDEKS I MORFOMETRIJA DAGNJE Mytilus galloprovincialis L. U
BOKOKOTORSKOM ZALIVU U PERIODU DECEMBRA

CONDITIONAL INDEX AND MORPHOMETRY OF MUSSEL Mytilus galloprovincialis L. IN BOKA
KOTORSKA BAY IN DECEMBER

Autor: ANTONIJA RADULOVIĆ Šesta beogradska gimnazija – IV godina

Regionalni centar za talente Beograd II Mentor: SLAĐANA GVOZDENOVIĆ, master ekologije

REZIME

U Jadranskom moru dagnja Mytilus galloprovincialis je široko rasprostranjena i zastupljena u komercijalnom uzgoju. Jedan od
načina procene celokupnog zdravlja organizma je određivanje kondicionog indeksa. Sezonske varijacije u vrednostima
kondicionog indeksa zavise od polnog ciklusa, prisutnosti hrane kao i od promena ekoloških faktora sredine. Cilj ovoga
istraživanja je predstaviti kondicioni indeks dagnji u toku zimskog perioda, morfometriju, dužinsko-težinske odnose i odnos
polova na 8 lokacija u Bokokotorskom zalivu, uporediti kondicioni indeks i morfološke parametre po lokalitetima i prodiskutovati
rezultate na osnovu literaturnih podataka. Uzorkovanje je vršeno na sedam lokaliteta, uzgajališta dagnji (Ljuta, Orahovac 1,
COGImar, Risan, Sveta Neđelja, Obala Đuraševida, Kalardovo), na osmom lokalitetu (IBM) dagnje su uzorkovane iz prirodne
populacije. Ukupan broj analiziranih jedinki sa svih lokaliteta je 239. Prilikom obrade, uzimani su morfometrijski karakteri: širina,
visina i dužina ljušture. Karakteri ukupna masa, masa mokrog mesa i masa ljušture su mereni vagom. Pol je determinisan
vizuelno na osnovu boje gonada. Kondicioni indeks je računat na osnovu mase mokrog mesa i ukupne mase školjkaša po
(Almeida i sar., 1999). Najvedi kondicioni indeks zabeležen je na lokalitetu COGImar, a najmanji na lokalitetu IBM u prirodnoj
populaciji. Najvede vrednosti ukupnih masa i dimenzija jedinki zabeležene su na Obali Đuraševida, najmanje na lokalitetu
Orahovac 1. Posmatranjem dužinsko-težinskih odnosa populacija utvrđeno je da najpravilniji odnos dužinskog rasta i mase
imaju populacije iz Risna i COGImar. Rezultati pokazuju da je proces rasta i razvida dagnji uslovljen velikim brojem varirajudih
sredinskih faktora koji uključuju sastav hrane, salinitet, temperaturu vode kao i antropogene faktore. COGImar ima znatno vede
vrednosti zbog multitrofičkog načina uzgoja jer dagnje imaju više hrane; Obala Đuraševiča u zimskom periodu ima najpovoljnije
vrednosti temperature i saliniteta u odnosu na ostala uzgajališta.

Ključne reči: dagnja, kondicioni indeks, morfometrija, sredinski faktori, rast, komercijalni uzgoj

SUMMARY

In the Adriatic Sea mussel Mytilus galloprovincialis is widespread and frequent in commercial cultivation. One way to assess the
overall health of the body is to determine the condition index. Seasonal variations in the values of condition index depend on
the sexual cycle, the presence of food as well as changes in ecological environmental factors. The aim of this study is to present
a condition index of mussels during the winter period, morphometry, length-weight relationship and the sex ratio at 8 locations
in the Bay of Kotor, compare condition index and morphological parameters by localities and discuss results based on literature
data. Sampling was conducted at seven sites, mussel farms (Ljuta, Orahovac 1, COGImar, Risan, Sveta Neđelja, Obala Đuraševida,
Kalardovo), at the eighth site (IBM) mussels were sampled from the native population. Total number of analyzed individuals
from all sites was 239. During processing, following morphometric characters were taken: width, height and length of the shell.
Characters of total mass, the mass of wet meat and shell weight were measured by beam scale. Gender is determined visually
on the basis of the color of the gonads. The condition index is calculated based on the weight of wet meat and the total mass of
the shellfish (Almeida et al., 1999). The largest condition index was recorded at the site COGImar, and the smallest at the site of
IBM in natural populations. The highest values of total weight and dimensions of specimens were recorded at Obala Đuraševida,
lowest at the site of Orahovac 1. By observation of length-weight relationship of populations has been found that the most
correct ratio of the length growth and the masses have a population of Risan and COGImar. The results show that the process of
growth and development of mussels caused by a large number of varying environmental factors including food composition,
salinity, water temperature, and anthropogenic factors. COGImar has a much higher value because of multitrophic cultivation
method so mussels have more food; Obala Đuraševida in the winter has the best values of temperature and salinity in relation
to other farms.