Reproductive Biology and Growth of the Shiba Shrimp, Metapenaeus Joyneri (Decapoda: Penaeidae), on the Western Coast of Korea
Bibliographic record
Abstract
Reproduction, growth, population structure, and size at sexual maturity of the shiba shrimp, Metapenaeus joyneri were investigated in the western coast of Korea, Yellow Sea, from April 1994 to November 1995. The spawning season was June–August with peaks in July. Inseminated shrimp appeared from June to August, and the recruitment to the fished population took place in August. This shrimp shows a one-year life cycle with a single spawning season. Size at |$50\% $| sexual maturity |$({{\rm{CL}}_50})$|, determined from both mature females and inseminated females, was |$19.6\;{\rm{mm}}$| and |$20.4\;{\rm{mm}}\;{\rm{CL}}$|, respectively. The smallest mature female found was |$19\;{\rm{mm}}\;{\rm{CL}}$|. Fecundity was directly proportional to the size of the female, with clutch sizes varying from 73,185 ova in the smallest female to 206,131 ova in the largest. Diameters of ova ranged from |$220\;{\rm{\mu m}}$| to |$340\;{\rm{\mu m}}$|. Size distribution of the population was similar in both years of the study. Shrimps were not caught within the studied area during winter (December–March), indicating that the shrimp migrated outside the range of the fishery or were not catchable at this time. Growth was estimated by the modified von Bertalanffy growth function incorporating seasonal variation in growth. In both years, females (|$K = 1.22\;{\rm{yea}}{{\rm{r}}^{ - 1}}$| and |${L_\infty } = 34.7\;{\rm{mm}}\;{\rm{CL}}$|) grew faster and reached a larger size at the same age than males (|$K = 1.02\;{{\rm{year}}^{ - 1}}$| and |${L_\infty } = 29.0\;{\rm{mm}}\;{\rm{CL}}$|). The result is supported by differences in growth performance indices |$({\rm{\varphi '}})$| between females and males.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.003 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".