Naslov
Distribution and year-cycle of the new non-indigenous crayfish species established in Croatia

Autori
Cvitanić, Marija ; Maguire, Ivana ; Hudina, Sandra

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

Izvornik
FINS Freshwater invasive networking for strategy (Book of abstracts of FINSII conference) / Piria, Marina - Zagreb : Agronomski fakultet Sveučilišta u Zagrebu, 2016, 28-28

Skup
FINS Freshwater invasive networking for strategy

Mjesto i datum
Zagreb, Hrvatska, 11.07.2016. - 14.07.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
marble crayfish; fecundity; reproduction activity; size structure

Sažetak
The marble crayfish (Procambarus fallax f. virginalis) is a relatively new non-indigenous crayfish species (NICS) that has established populations in Europe. Established population of marble crayfish was recently discovered in a gravel pit in Northwest Croatia, making it the third NICS present in Croatian freshwaters. In this study we looked into marble crayfish distribution in this region of Croatian territory, and examined some basic population characteristics such as year cycle characteristics and size structure. Fieldwork showed that the marble crayfish is only present in the gravel pit and its canals, while in neighboring waterbody (only 0.45 km away) – the Drava River, the signal crayfish (Pacifastacus leniusculus) presence was recorded. Marble crayfish in the gravel pit were reproductively active during the whole sampling period (from May to November 2015). Peaks of reproduction activity were recorded from September to November, when both individuals with pleopodal eggs or juveniles as well as individuals with ripe ovarian eggs were recorded. The smallest reproductively active female was 40.81 mm TL. Gonadosomatic index was the highest in May and September, indicating the most pronounced egg production in that period. Size structure of caught crayfish also varied during the sampling period, with significantly increased proportion of smaller-sized individuals in the catch during the peak reproduction activity period. Collected information regarding distribution, size structure and fecundity of the marble crayfish in Croatia represents baseline data for the development of management strategies aimed at its control.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA