Borg, 1982


No detailed citation.

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Gasterosteus aculeatus Male Onset of spermatogenesis September ['September']
Gasterosteus aculeatus Male Main spermatogenesis activity In October the testes are to a large extent filled with spermatocytes and spermatids. Sepermatogenesis is completed in November-January ['January', 'October', 'November']
Gasterosteus aculeatus Male Maximum GSI value The peak of the GSI is reached in October, about a mean of 1.4, up to 1.6, and is followed by a gradual decline until August when the lowest values are reached 1.4 percent
Gasterosteus aculeatus Spawning conditions Spawning season May-June ['May', 'June']