Genotype-dependent Variability in Somatic Tissue and Shell Weights and Its Effect on Meat Yield in Mixed Species [Mytilus edulis L., M. trossulus (Gould), and Their Hybrids] Cultured Mussel Populations
Bibliographic record
Abstract
Meat yield, expressed as the ratio of somatic tissue weight (flesh or meat weight) to total weight, is extensively used in the Atlantic Canadian mussel culture industry as a measure of product quality and market suitability at harvest. Atlantic Canadian mussel populations typically exhibit high genotypic variability with stocks at most sites consisting of mixtures of Mytilus edulis, M. trossulus, and their hybrids in widely varying proportions. In this paper, we examine relationships among genotypic variability, shell and somatic tissue weight, and their effect on measurement of meat yield. We further compare these relationships in populations grown from indigenous seed collection with those derived from transferred seedstock, and across different year classes within sites. Within 10 of 13 samples, M. edulis were greater than M. trossulus in shell length. Within all samples, weights of somatic tissue (flesh weight) and shell varied significantly with shell length. M. edulis typically had greater flesh and shell weights than M. trossulus. Hybrids tended to have intermediate values. Similar genotype-dependent relationships between shell weight and shell length occurred in all year classes taken from the same site. However, flesh weight relationships with shell length were inconsistent among year classes. Within-sample genotype-dependent relationships between flesh weight and shell length evident in indigenously-reared populations did not always persist in transferred populations. Meat yield was not significantly related to shell length. Meat yield was significantly greater in M. trossulus than in M. edulis in 12 of the 13 samples. Similar within-sample relationships between meat yield and genotype were evident among year classes and between indigenously-reared and transferred populations with M. trossulus having greater meat yields than M. edulis. Averaged over all samples, mean meat yield in M. trossulus was 7.4% greater than in M. edulis. Possible industry implications of these genotype-dependent differences are discussed.
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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 | 0.001 |
| 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".