Reproduction of Gadus morhua
Document source: http://www.fishbase.org/Reproduction/FishReproSummary.php?ID=69&StockCode=79
 
Main Ref. Cohen, D.M., T. Inada, T. Iwamoto and N. Scialabba, 1990
Mode dioecism
Fertilization external
Spawning frequency one clear seasonal peak per year
Batch spawner Yes.   Ref.  Kjesbu, O.S., H. Kryvi, S. Sundby and P. Solemdal, 1992
Reproductive guild nonguarders
open water/substratum egg scatterers
Parental Care none
Description of life cycle and mating behavior Spawning occurs in winter and beginning of spring, where big schools are formed. Spawning sites are in offshore waters, at or near the bottom, in 50-200 m depth and 0-12 °C (preferred range 0-6°C) (Refs. 1371, 89387). May form spawning aggregations in the water column when bottom temperatures are unsuitable (Ref. 1371). Different spawning areas may be used in subsequent years (Ref. 89387). Embryo development lasts about 14 days (at 6°C) and larval phase lasts about 3 months(at 8°C). Fecundity ranges from 2.5 million eggs in a 5 kg female to a record of 9 million eggs in a 34 kg female. Reported number of batches spawned in an experiment is 8 - 22 (Ref. 5513). Sex ratio is nearly 50%, with slight predominance of females. Classified as a determinate multiple spawner (Ref. 40290). Older and larger cod had been found to produce larger eggs with neutral buoyancy at lower salinities. This can be crucial to egg and larval survival (Refs. 31930, 38384). Larvae are pelagic up to 2.5 months before settling on the bottom (Ref. 1371).
Search for more references on reproduction Scirus
(e.g. 9948)
( e.g. cephalopods )
Entered by Froese, Rainer on 04.03.92
Modified by Opitz, Silvia on 07.24.14
Comments & Corrections
Sign our Guest Book
Back to Search

Publish in our journal partner Acta Ichthyologica et Piscatoria the results of your primary research on fishes about growth, weight-length relationships, reproduction (maturity, fecundity, spawning), food and diet composition, introductions and range extensions for faster subsequent entry in (2011 impact factor: 0.547).

cfm script by eagbayani, 21.08.01 ,  php script by rolavides, 11/02/08 ,  last modified by elaxamana, 10:43 AM 1/09/09