Annual production and population dynamics of a relatively unexploited walleye, Stizostedion vitreum vitreum (Mitchill 1818), population in Savanne Lake, Ontario / by Jagraj S. Sandhu. --
Bibliographic record
Abstract
Most studies of the walleye have been conducted on highly \nexploited populations. Savanne Lake in northwestern Ontario, and \nhaving an area of 364.29 ha, was exploited until 1969, whereupon \nit was designated a fish sanctuary. Study was conducted during \nthe spring months of 1973, 1974 and 1976. Walleyes were marked \nand recaptured in trapnets. Marking was accomplished by attaching \na Floy tag FTF69 under the second dorsal fin with monofilament \nline. The 6th, 12th and second dorsal spines were clipped In the \nsprings of 1973, 1974 and 1976, respectively, for Schumacher- \nEschmeyer estimates. Schumacher-Eschmeyer spring population estimates \nof 5211, 5184 and 5463 for the three study years represent \nthe spawning population most vulnerable to the gear. \nThe annual mortality rates were a high 8 to 85% for the component \nof the population sampled and characteristically increased \nwith age over the three years of study. \nGrowth retardation was observed among tagged walleyes; some \nof the walleyes neither grew in length nor laid down a new annulus \nin each year of their life. These observations were attributed \nto limited food supply and extensive handling, tagging and finclipping \nof the fish over the study period. \nNo relationship was noted between year-class strength and \nyear-class growth. Walleyes showed similar annual percentage \nincrements in their growth during the three sampling years. Relative \ngrowth of walleyes increased substantially by the end of the \nfirst year, decreased sharply the second year and continued to \ndecrease at a lesser rate until, on the average, the fifth or \nsixth year. After this, growth was very slow. \nAnnual biomass of 6.58 kg.ha[superscript 1] for 1973-74, 6.06 kg.ha[superscript 1] for 1974-75 and 2.64 kg.ha[superscript 1] for 1975-76 for age groups 7 and older was low. Production estimates of 1.0 kg.ha[superscript 1].yr[superscript 1] for 1973-74, 1.31 kg.ha[superscript 1].yr[superscript 1] for 1974-75 and 0.52 kg.ha[superscript 1].yr for 1975-76 for age groups 7 and older are likely values for a theoretical yield of 1.9 kg.ha[superscript 1].yr[superscript 1] based on the morphoedaphic \nindex (Ryder 1965) and support the 30 percent rule. The brood \nstock production estimate of 1.85 kg.ha[superscript 1].yr[superscript 1] for fish of age 5.5 (weighted mean age to first maturity) and older, and representing \nabout 20% of the total walleye production in the lake, \nrelates closely to the theoretical yield of 1.9 kg.ha[superscript 1]..yr[superscript 1] based on the 30 percent rule. \nThe slow growth of the walleyes was attributable to chemical \ncharacteristics typical of lakes in this region of the Canadian \nShield, as well as to their high density relative to the available \nfood.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".