Size at Maturity in the Male Alaskan Tanner Crab, Chionoecetes bairdi, as Determined by Chela Allometry, Reproductive Tract Weights, and Size of Precopulatory Males

1972 ◽  
Vol 29 (4) ◽  
pp. 423-427 ◽  
Author(s):  
Ralph B. Brown ◽  
Guy C. Powell
Keyword(s):  
Reproductive Tract ◽  
Carapace Width ◽  
Commercial Fishery ◽  
Frequency Data ◽  
Morphometric Measurements ◽  
Commercial Catch ◽  
Tanner Crab ◽  
Male Brood ◽  
Size At Sexual Maturity ◽  
Chionoecetes Bairdi

An Alaskan Commercial Fishery for tanner crab, Chionoecetes bairdi, has recently developed. Only males are legally taken. No size limit exists and the objective of the study was to determine size at sexual maturity as a biological basis for maintaining male brood stocks in adequate numbers. Morphometric measurements, reproductive tract weights, and size of precopulatory males indicate that 50% of the males are mature at about 110-mm carapace width. Using commercial catch size frequency data, the proportion of immature males in the commercial catch was interpolated at less than 3%.

Regional Variation in the Size of Maturity of Two Species of Tanner Crab (Chionoecetes bairdi and C. opilio) in the Eastern Bering Sea, and Its Use in Defining Management Subareas

1981 ◽  
Vol 38 (2) ◽  
pp. 163-174 ◽  
Author(s):  
David A. Somerton
Keyword(s):  
Bering Sea ◽  
Regional Variation ◽  
Carapace Width ◽  
Minimum Size ◽  
Computer Technique ◽  
Eastern Bering Sea ◽  
Commercial Harvest ◽  
Tanner Crab ◽  
Size Limits ◽  
Chionoecetes Bairdi

Minimum size limits for the commercial harvest of tanner crab (Chionoecetes bairdi and C. opilio) are based on the sizes of sexual maturity. Establishing such size limits in the eastern Bering Sea is complicated by a large regional variation in the size of maturity. A computer technique was developed which partitioned the eastern Bering Sea into subareas that were relatively homogeneous with respect to the size of maturity. The best partitioning for C. bairdi was a separation of the eastern Bering Sea into two subareas along 167°15′N longitude. No acceptable partitioning could be found for C. opilio. The size of 50% maturity for male C. bairdi was estimated to be 108.9 mm carapace width in the western subarea and 117.0 mm in the eastern subarea. The size of maturity upon which the current minimum size for C. bairdi is based is nearly the same as the size estimated for the western subarea but significantly less than the size estimated for the eastern subarea.Key words: crabs, size of maturity, Chionoecetes bairdi, Chionoecetes opilio, tanner crab, eastern Bering Sea

scholarly journals CURRENT STATE OF STOCK FOR TANNER CRAB CHIONOECETES BAIRDI RATHBUN, 1924 (CRUSTACEA, DECAPODA) AT THE SOUTH-EASTERN COAST OF KAMCHATKA

2019 ◽  
Vol 197 ◽  
pp. 127-142 ◽  
Author(s):  
O. G. Mikhailova
Keyword(s):  
Carapace Width ◽  
Kamchatka Peninsula ◽  
Eastern Coast ◽  
Total Allowable Catch ◽  
Current State ◽  
Southeastern Kamchatka ◽  
Crab Population ◽  
Tanner Crab ◽  
Trap Catches ◽  
Chionoecetes Bairdi

Tanner crab Chionoecetes bairdi is the highly valuable object of commercial fishery dwelling in the seas surrounding Kamchatka Peninsula. Its landings started at the southeastern coast of Kamchatka in early 1980s and continued till 2009, when the fishery was stopped by reasons independent on the stock state. It was launched again in 2017. Now the species is landed mostly in the Petropavlovskaya fishery subzone (62 % of the total allowable catch of tanner crab in Russia in 2019), whereas its stocks at southwestern Kamchatka and in the northwestern Bering Sea are rather low. Modern condition of the tanner crab population and its distribution at southeastern Kamchatka are considered on the data of the trap surveys conducted in spring and summer of 2012 and 2018. Between these years, commercial males of these species spread wider at southeastern Kamchatka and formed commercial aggregations in the northern Avachinsky Bay and in the southern and central parts of the Kronotsky Bay, but were rare southward from Cape Povorotny. They became larger: while size of the males varied in the range 50–170 mm in both years, the males with the carapace width < 120 mm prevailed in 2012, but the large-sized males with commercial size were more numerous in 2018. Percentage of the females in the catches was low both in 2012 and 2018 that is typical for the trap catches. The crabs at the 3rd stage of molting dominated both in May and August of 2012 and 2018. Injury level of the commercial males was rather high and increased from 2012 to 2018 in 8 %. Good current condition of the tanner crab population at southeastern Kamchatka is concluded.

Patterns in connectivity and retention of simulated Tanner crab (Chionoecetes bairdi) larvae in the eastern Bering Sea

2015 ◽  
Vol 138 ◽  
pp. 475-485 ◽  
Author(s):  
Jonathan I. Richar ◽  
Gordon H. Kruse ◽  
Enrique Curchitser ◽  
Albert J. Hermann
Keyword(s):  
Bering Sea ◽  
Eastern Bering Sea ◽  
Tanner Crab ◽  
Chionoecetes Bairdi

Dynamics and Species Interactions in the Commercial Fishery of the Red lakes, Minnesota

1992 ◽  
Vol 49 (2) ◽  
pp. 293-302 ◽  
Author(s):  
Donald L. Pereira ◽  
Yosef Cohen ◽  
George R. Spangler
Keyword(s):  
Species Interactions ◽  
Yellow Perch ◽  
Animal Feed ◽  
Age Distribution ◽  
Power Spectra ◽  
Commercial Fishery ◽  
Catch Per Unit Effort ◽  
Commercial Catch ◽  
Aplodinotus Grunniens ◽  
Freshwater Drum

The Red Lakes, Minnesota, have supported a commercial fishery for walleye (Stizostedion vitreum vitreum) and yellow perch (Perca flavescens) since 1917. Since 1972, harvests indicate increased variance in recruitment of percids and an increase in biomass of freshwater drum (Aplodinotus grunniens). We subjected commercial catch-per-unit-effort (CPUE) records of walleye, yellow perch, and animal feed (composed primarily of drum) to spectral analysis. Estimated power spectra displayed peaks at 8.5, 10, and 17 yr for walleye, yellow perch, and animal feed, respectively. Walleye and yellow perch CPUE time series were significantly coherent at periods ranging from 5to 10 yr, confirming the predator–prey relationship and common recruitment patterns of these two species. Interpretation of coherency between drum and the two percid species required knowledge of the age distribution of freshwater drum. The apparent exponential increase in drum biomass as indicated by commercial CPUE is primarily due to strong year classes in 1955, 1970, and 1983. While drum recruitment and growth are consistent with the periodicity in the autospectrum, we find little evidence from coherencies that drum recruitment is related to the dynamics of wlleye or perch populations.

scholarly journals Characterization of the gene repertoire and environmentally driven expression patterns in Tanner crab (Chionoecetes bairdi)

2021 ◽  
Author(s):  
Grace Crandall ◽  
Pamela C Jensen ◽  
Sam White ◽  
Steven Roberts
Keyword(s):  
Disease Transmission ◽  
Expression Patterns ◽  
Ocean Warming ◽  
Lipid Storage ◽  
Host Susceptibility ◽  
Gene Repertoire ◽  
Important Species ◽  
Tanner Crab ◽  
Chionoecetes Bairdi ◽  
Insight Into

Tanner crab (Chionoecetes bairdi) are an economically important species that is threatened by ocean warming and Bitter Crab Disease, which is caused by an endoparasitic dinoflagellate, Hematodinium. Little is known about disease transmission or its link to host mortality, or how ocean warming will affect pathogenicity or host susceptibility. To provide a transcriptomic resource for the Tanner crab we generated a suite of RNA-seq libraries encompassing pooled hemolymph samples from crab displaying differing infection status and maintained at different temperatures (ambient (7.5˚C), elevated (10˚C), or decreased (4˚C)). After assembling a transcriptome and performing a multifactor differential gene expression analysis, we found genes influenced by temperature in relation to infection, and detected some of those genes over time at the individual level using RNAseq data from one crab. Biological processes associated with those genes include lipid storage, transcription, response to oxidative stress, cell adhesion, and morphogenesis. Alteration in lipid storage and transcription provide insight into how temperature impacts energy allocation in Hematodinium infected crabs. Alteration in expression patterns in genes associated with morphogenesis could suggest hemocytes were changing morphology and/or type in response to temperature. This project provides insight into how Hematodinium infection could influence crab physiology as oceans warm.

A Computer Technique for Estimating the Size of Sexual Maturity in Crabs

1980 ◽  
Vol 37 (10) ◽  
pp. 1488-1494 ◽  
Author(s):  
D. A. Somerton
Keyword(s):  
Bering Sea ◽  
Sexual Maturity ◽  
Carapace Width ◽  
Logistic Function ◽  
Body Dimension ◽  
Computer Technique ◽  
Eastern Bering Sea ◽  
Paralithodes Camtschatica ◽  
Chionoecetes Bairdi ◽  
Size Estimates

A new computer technique for estimating the size of 50% sexual maturity from crab morphometric data is described. Using nonhierarchical cluster analysis, crabs are assigned to either of two maturity groups based on the size of one body dimension relative to another. The size of 50% maturity is then estimated by using nonlinear regression to fit a logistic function to percent maturity and size estimates. The size of 50% maturity in the eastern Bering Sea was estimated to be 102.8 and 101.9 mm (carapace length) for male and female Paralithodes camtschatica and 114.7 mm (carapace width) for male Chionoecetes bairdi. These estimates are similar to estimates for these species obtained previously by other techniques.Key words: crabs, growth, sexual maturity, Paralithodes, Chionoecetes

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