Brazo, 1975



Citation


No detailed citation.

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Perca flavescens Spawning conditions Spawning period duration The spawning period occured from the middle of May through the end of June No data
Perca flavescens Female Maximum GSI value The fecundity index gradually increased smoothly for all age classes from April to May reaching a value of 20-25% immediatly before spawning 22.5 percent
Perca flavescens Female Age at sexual maturity Except fot two age II females taken in the summern all fish older than age I were mature No data
Perca flavescens Female Onset of oogenesis In September, ovarian weights began to increase again and reached 4-5% of body weight for all age classes by mid-November, when the study was terminated ['November', 'September']
Perca flavescens Spawning conditions Spawning migration period In early Paril, most perch were in deep water (24 m). As water temperatures increased from 2 to 4°C, the fish moved shoreward. By 21 May, water temperature had reached 6-7°C and migration of male perch into shallow water (6-12 km) occurred ['May']
Perca flavescens Female Absolute fecundity Fecundity ranged from 10.654 eggs for an age II female (190 mm total length, 82g) to 157,594 eggs for an age VI fish (354 mm, 678 g) 10.654 thousand eggs
Perca flavescens Spawning conditions Spawning season The spawning period occured from the middle of May through the end of June ['May', 'June']
Perca flavescens Female Length at sexual maturity Size of female at age 2 range from 9.9-16.2 13.05 cm
Perca flavescens Male Length at sexual maturity Size of male at age 2 range from 9.9 to 15.9 2.0 cm
Perca flavescens Female Age at sexual maturity Except fot two age II females taken in the summern all fish older than age I were mature No data