Repeat sexual maturation of wolffish ( Anarhichas lupus L.) broodstock

• Published in: Aquaculture Vol. 139; no. 3; pp. 249 - 263
• Main Authors: Pavlov, Dimitri A., Moksness, Erlend
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1996; Elsevier Sequoia S.A
• Subjects: ANARHICHAS LUPUS; ANIMAL REPRODUCTEUR; Animal reproduction; ANIMAL REPRODUCTOR; Aquaculture; BREEDING STOCK; Broodstock; CALIDAD; Egg quality; FEMALES; FEMELLE; Fish; HEMBRA; MADUREZ SEXUAL; MATURITE SEXUELLE; OVA; OVULACION; OVULATION; OVULE; OVULO; QUALITE; QUALITY; SEXUAL MATURITY; TEMPERATURA; TEMPERATURE; Anarhichas lupus; Temperature; Egg quality; Broodstock
• ISSN: 0044-8486; 1873-5622
• DOI: 10.1016/0044-8486(95)01169-2

Female maturation and egg quality of common wolffish,
Anarhichas lupus L., from a broodstock were followed during the breeding season of 1993–1994. The results are compared with the data obtained for the 1992–1993 breeding season. The water temperature was lower in 1993–1994 than in 1992–1993; it reached 10–12 °C and 12–14 °C respectively before the beginning of the breeding seasons. Thirty-five females, 76% of those that spawned in 1992–1993, matured and released ovulated eggs again in 1993–1994. The time of final maturation and ovulation of eggs in 1993–1994 was similar to that in 1992–1993. Egg fertility increased in 1993–1994: 69% of first and repeat spawners had high proportions (90–100%) of normally cleaved eggs. Only 6.4% of females had such proportions in 1992–1993. Increased egg fertility was accompanied by fewer ovulated but resorbed eggs and larger egg diameter. The results suggest that for normal egg maturation females must be kept at a temperature below 10 °C for at least 4 months before ovulation.