Walleye age estimation using otoliths and dorsal spines: …
2017年12月1日 · Our results provide useful guidance on structure and preparation technique selection for Walleye age estimation, thereby allowing biologists to develop sampling guidelines that could be implemented using information that is always (TL) or often (sex) available at the time of fish collection.
Validation of otolith ages for walleye (Sander vitreus) in the ...
2015年7月1日 · Our results from fish considered known age validate the accuracy of otolith age estimates for walleye up to age-10, with corroborating evidence from catch curves and accurate recruitment indices strongly suggesting that otoliths are valid for …
The described method provides a consistent and repeatable means ageing of walleye otoliths. Although otolith collection takes more time in the field than the collection of most other age structures, the laboratory preparation is faster and easier than pelvic
Otolith sections not only can provide accurate age estimates and back-calculated length estimates for young walleye populations but also they are easier to age, and consequently are more accurate for determining ages of older walleyes than are scales and dorsal spines.
Age and growth of larval and juvenile walleye pollock, Theragra ...
1984年11月30日 · The observed interrelationships between total length, otolith length and fish age (number of increments) validated the otolith reading for analyses of the initial growth of walleye pollock. A possibility that otolith microstructure changes can be utilized as information source of some ecological events in the early life history is suggested.
Based on the findings of this study and other research showing that otoliths consistently provide more precise and accurate age estimates than scales, we recommend using otoliths to age walleyes...
Walleye Age Estimation Using Otoliths and Dorsal Spines: …
2017年8月22日 · Our results from fish considered known age validate the accuracy of otolith age estimates for walleye up to age-10, with corroborating evidence from catch curves and accurate recruitment...
The Validity of Otolith-Based Age Estimates for the Walleye …
2019年11月1日 · According to data inferred from the otolith analysis, the life expectancy of walleye pollock in the eastern Sea of Okhotsk reaches 20 years. However, fish of this age are found rarely, and the major part of catches is represented by individuals at ages of 6–9 yrs.
Mass-processing method for aging otoliths of walleye pollock
The reliability of a mass-processing aging method for walleye pollock Theragra chalcogramma was examined. The method is a half-otolith method, in which 10–20 otoliths are embedded simultaneously in black resin and the mass-processed half plane section is viewed under reflected light (black-resin method).
Validation of otolith ages for walleye (Sander vitreus) in the ...
2015年7月1日 · Our results from fish considered known age validate the accuracy of otolith age estimates for walleye up to age-10, with corroborating evidence from catch curves and accurate recruitment indices strongly suggesting that otoliths are valid for …
- 某些结果已被删除