Reproduction parameters of hatchery reared grayling (Thymallus thymallus) females

Tjaša Kodela (Author), Dušan Jesenšek (Author), Simona Sušnik Bajec (Author)

Abstract

European grayling (Thymallus thymallus) is an endangered salmonid fish species and its populations have decreased considerably in European waters in recent decades. One of the conservation measures applied to grayling is stocking with hatchery-reared fish. To advance the knowledge of grayling reproduction in the hatchery, husbandry data were systematically collected in the period from 2006 to 2015 during grayling spawning seasons and analyzed to quantify grayling female reproductive parameters such as fecundity, egg size, and embryo survival to the eyed egg stage. Data was collected for first time spawners (3 years old) and repeat spawners reared in the hatchery. Statistically significant differences were found for the number of eggs between first time spawners, producing on average 3600 eggs, and repeat spawners, producing on average 8000 eggs. Absolute fecundity was positively correlated to grayling female total length and weight for both first time and repeat spawners. However, relative fecundity did not correlate with these parameters. A positive correlation was observed between female total length and mean egg weight for repeat spawners, while the correlation was negative for first time spawners. Heavier eggs tended to have a higher rate of survival until the eyed egg stage, though the correlation was stronger for first time spawners than for repeat spawners. Due to the higher reproductive success of repeat spawners, it could be concluded that larger and older grayling females should be included in hatchery reproduction.

Keywords

ribe;lipan;Thymallus thymallus;reprodukcija;samice;

Data

Language:	English
Year of publishing:	2023
Typology:	1.01 - Original Scientific Article
Organization:	UL BF - Biotechnical Faculty
UDC:	597.2/.5
COBISS:	138761219
ISSN:	0378-4320
Views:	176
Downloads:	26
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	ribe;lipan;Thymallus thymallus;reprodukcija;samice;
Type (COBISS):	Article
Pages:	str. 1-11
Volume:	ǂVol. ǂ249
Issue:	[article no.] 107196
Chronology:	2023
DOI:	10.1016/j.anireprosci.2023.107196
ID:	18498173