Pulliainen, E. and Korhonen, K. (1990) Seasonal changes in condition indices in adult mature and no-maturing burbot, Lota lota (L.), in the nort-eastern Bothnian Bay, northern Finland. J. Fish. Biol., pp. 251-259
| Species | Development state | Trait | Primary Data | Secondary Data |
| Lota lota | Female | Length at sexual maturity | The mean length of mature males and females was the same 49 ± 3 cm | 49.0 cm |
| Lota lota | Female | Onset of oogenesis | August | ['August'] |
| Lota lota | Female | Intensifying oogenesis activity | November-December | ['November', 'December'] |
| Lota lota | Female | Resting period | April to August | 6.0 months |
| Lota lota | Male | Length at sexual maturity | The mean length of mature males and females was the same 49 ± 3 cm | 49.0 cm |
| Lota lota | Male | Onset of spermatogenesis | Slight increase in June, clear increase in November | ['June', 'November'] |
| Lota lota | Male | Main spermatogenesis activity | October-November | ['October', 'November'] |
| Lota lota | Male | Resting period | No difference in term of GSI between April and July, and even up to October | 6.0 months |
| Lota lota | Spawning conditions | Spawning season | In 1987, spawning males were found from 13 March to 5 April and females from 2 March to 27 March, whereas in 1988 spawning occurred earlier: from 26 February to 20 March in the males and from 11 February to 11 march in the females. | ['February', 'March', 'April'] |
| Lota lota | Spawning conditions | Parity | Burbot spending a rest year do not accumulate and store energy reserves over the summer for the next year, and that such rest years, if they exist, do not occur for nuttritional reasons | No category |