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REPRODUCTIVE CYCLE AND MONITORING OF SCALLOP LARVE (PECTEN JACOBAEUS L.) IN PLANKTON FROM THE MOUTH OF THE RIVER KRKA
Drago Marguš
; Institut "Ruđer Bošković", Centar za istraživanje mora Zagreb, Laboratorij za istraživanje i razvoj akvakulture, Bijenička 54, Zagreb, Hrvatska
Emin Teskeredžić
; Institut "Ruđer Bošković", Centar za istraživanje mora Zagreb, Laboratorij za istraživanje i razvoj akvakulture, Bijenička 54, Zagreb, Hrvatska
Zlatica Teskeredžić
; Institut "Ruđer Bošković", Centar za istraživanje mora Zagreb, Laboratorij za istraživanje i razvoj akvakulture, Bijenička 54, Zagreb, Hrvatska
Marija Tomec
; Institut "Ruđer Bošković", Centar za istraživanje mora Zagreb, Laboratorij za istraživanje i razvoj akvakulture, Bijenička 54, Zagreb, Hrvatska
Sažetak
The presence of Pectinidae and the development of aquaculture at the mouth of the river Krka inspired investigations on the gonad index, seasonal changes of tissue weight of the scallop (Pecten jacobaeus L.) as well as the distribution of its larvae in plankton of the river mouth. The aim of this study was to learn about their reproductive cycle and determine the possibility of collecting young for controlled culture.
Based on results of investigations of the reproductive cycle it was determined that the scallops spawn in the spring. The highest occurrence of scallop larvae in plankton was recorded in temperatures of about 18 to 20°C and a salinity of above 30 x 10-3.
The optimal time for collecting juvenile scallops, at the mouth of the river Krka, for use in controlled culture, is the period from March to July, and the optimal depth for placing the collectors (on localities of 20 and more meters) is between 10 and 15 meters.
Ključne riječi
Hrčak ID:
70541
URI
Datum izdavanja:
29.6.1993.
Posjeta: 1.412 *