Acta Adriatica, Vol. 59 No. 2, 2018.
Izvorni znanstveni članak
https://doi.org/10.32582/aa.59.2.2.
Reproductive pattern of the anchovy, Engraulis encrasicolus (Linnaeus, 1758), in the Boka Kotorska Bay (Montenegro, southern Adriatic Sea)
Mirko Đurović
; Institut za biologiju mora, Univerzitet Crne Gore, P.P. 69, 85330 Kotor, Crna Gora
Aleksandar Joksimović
; Institut za biologiju mora, Univerzitet Crne Gore, P.P. 69, 85330 Kotor, Crna Gora
Ana Pešić
; Institut za biologiju mora, Univerzitet Crne Gore, P.P. 69, 85330 Kotor, Crna Gora
Olivera Marković
; Institut za biologiju mora, Univerzitet Crne Gore, P.P. 69, 85330 Kotor, Crna Gora
Slobodan Regner
; Univerzitet u Beogradu, Institut za multidisciplinarna istraživanja, Kneza Višeslava 1, 11030 Beograd, Srbija
Milica Mandić
; Institut za biologiju mora, Univerzitet Crne Gore, P.P. 69, 85330 Kotor, Crna Gora
Zdravko Ikica
; Institut za biologiju mora, Univerzitet Crne Gore, P.P. 69, 85330 Kotor, Crna Gora
Sažetak
The annual alteration of gonad morphology in anchovy, Engraulis encrasicolus (Linnaeus,1758), caught in the period from July 2006 to June 2007 using beach seines in the region of Boka Kotorska Bay (Montenegro, southern Adriatic) was studied. Samples were taken each month. Total length of individuals ranged from 6.6 to 12.2 cm, while weight ranged from 1.58 to 11.27 g, Their ovaries were extracted and weighed, and a piece of female gonad tissue was sampled for histological analysis. The length–weight relationship of all anchovy specimens was described by the equation: \(W = 0.0032\) \(L_T^3.2537; (r^2 = 0.9528)\). The lowest GSI values were found in November and remained at low levels until April, which corresponded to the gonad rest stage. The GSI increased gradually during April and May, which coincides with the begining of spawning period. Although primary oocytes (stage I) were present during all months, their percentage increased from October and was the highest during the winter months (November-March 100%). Mature cells, stage IV, were present during April – October period, with highest value in May when they comprised 12.3% of total oocyte number. An increase in the percentage of oocytes in the yolk vesicle (II) and yolk (III) stages occurred in April, remaining almost unchanged until October. Smallest average oocyte size was noticed in period November – February with an average of 59.69 μm, while greatest size was recorded in April 2007, 185.84 μm.
Ključne riječi
Engraulis encrasicolus; small pelagic; spawning; oogenesis; length structure; Boka Kotorska Bay
Hrčak ID:
215068
URI
Datum izdavanja:
20.12.2018.
Posjeta: 1.733 *