Details

Autor(en) / Beteiligte

• Nagler, James J.
• Adams, Bruce A.
• Cyr, Daniel G.

Titel

Egg Production, Fertility, and Hatch Success of American Plaice Held in Captivity

Ist Teil von

• Transactions of the American Fisheries Society (1900), 1999-07, Vol.128 (4), p.727-736

Ort / Verlag

Bethesda, MD: Taylor & Francis Group

Erscheinungsjahr

1999

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• The reproductive performance of individual female American plaice Hippoglossoides platessoides was monitored during a spawning season under laboratory conditions. The majority (74%) of females produced eggs at some point in a 2‐month period (May–July) during which they were checked every 2 d for ovulated eggs. Most females produced several batches of eggs during an average production period of 26 d. Approximately 12% of the total number of eggs produced by each female were obtained in the first egg batch. There were periodic peaks of egg production for the group in increasing intervals at about 8, 20, and 34 d after the first eggs were collected. The mean relative fecundity was 1.5 × 105 eggs/ kg body weight, but there was no relationship between actual fecundity and either length or weight. The mean percentages of viable and fertile eggs were 44.7% and 13.7%, respectively. A significant decline in the percentage of fertile eggs was observed with time, such that percent of fertile eggs by the sixth batch was significantly (P < 0.05) lower than in the first batch. There was no significant decline in viable eggs with time, although there was a positive correlation (r = 0.72, P < 0.001) between viability and fertility. The number of larvae hatched from viable eggs varied widely during the spawning period with a mean hatch success rate of 23%. A significant positive correlation was observed between the number of larvae hatched and the percentage of fertile eggs (r = 0.82, P < 0.001).