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

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

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

Does intense fishing on males impair mating success of female Dungeness crabs

1997 ◽  
Vol 54 (3) ◽  
pp. 655-669 ◽  
Author(s):  
D G Hankin ◽  
T H Butler ◽  
P W Wild ◽  
Q -L Xue
Keyword(s):  
Mating Success ◽  
Egg Production ◽  
Carapace Width ◽  
Minimum Size ◽  
Cancer Magister ◽  
Worst Case ◽  
Mature Adult ◽  
Commercial Harvest ◽  
Size Limits ◽  
Dungeness Crabs

Commercial capture of female Dungeness crabs, Cancer magister, is prohibited and minimum size limits for commercial harvest of male crabs are designed to allow most males to mate at least once before capture. Annual exploitation rates often exceed 90%, however, and the resulting scarcity of large males might reduce mating success among large females. We present new data regarding (i) sizes of male and female crabs collected in premating embraces, (ii) carapace width frequencies of female Dungeness crabs, (iii) presence of sperm plugs and sperm, and (iv) fecundity. Minimum carapace width of hard-shelled mating males typically exceeds postmolt carapace width of soft-shelled females (i), but female Dungeness crabs exceeding the minimum legal size of males usually account for less than 5% of mature adult female crabs (ii), and sublegal-sized males actively participate in mating (i). Remnants of sperm plugs, definitive indicators of mating, were found in 97.5% of recently molted large females (iii), suggesting that virtually all molting females mate regardless of size. On the basis of (ii) and (iv), hypothetical worst-case calculations, assuming that no large females could find mates, suggest that total egg production would be reduced by no more than 2-25% among molting female crabs.

scholarly journals Effect of bitter crab disease on rebuilding in Alaska Tanner crab stocks

2010 ◽  
Vol 67 (9) ◽  
pp. 2027-2032 ◽  
Author(s):  
M. Shareef M. Siddeek ◽  
Jie Zheng ◽  
Joseph F. Morado ◽  
Gordon H. Kruse ◽  
William R. Bechtol
Keyword(s):  
Bering Sea ◽  
Potential Effect ◽  
Management Plan ◽  
Reference Points ◽  
Commercial Fishing ◽  
Southeast Alaska ◽  
Control Rules ◽  
Eastern Bering Sea ◽  
Tanner Crab ◽  
Chionoecetes Bairdi

Abstract Siddeek, M. S. M., Zheng, J., Morado, J. F., Kruse, G. H., and Bechtol, W. R. 2010. Effect of bitter crab disease on rebuilding in Alaska Tanner crab stocks. – ICES Journal of Marine Science, 67: 2027–2032. Eastern Bering Sea (EBS) Tanner crab Chionoecetes bairdi stocks were declared overfished in 1996 and were closed to commercial fishing between 1997 and 2004. Subsequent management was based on a rebuilding plan using criteria from the previous US federal fisheries management plan (FMP). Under the revised 2008 FMP, reference points changed for mature biomass (male only vs. total), as well as catch levels (total vs. retained), resulting in different rebuilding criteria. We performed a rebuilding analysis using age-, sex-, and size-structured simulations incorporating recent changes in overfishing definitions. Specifically, we compared the potential effect of additional mortality that bitter crab disease could have on rebuilding performance of lightly infected EBS and heavily infected southeast Alaska Tanner crab stocks. The results suggest that under the assumed recruitment scenario, the new control rules are adequate to rebuild the depleted lightly infected EBS stock, but not the heavily infected southeast Alaska stock.

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%.

Should harvest control rules for male-only fisheries include reproductive buffers? A Bering Sea Tanner crab (Chionoecetes bairdi) case study

2021 ◽  
Vol 243 ◽  
pp. 106049
Author(s):  
Madison A. Heller-Shipley ◽  
William T. Stockhausen ◽  
Benjamin J. Daly ◽  
André E. Punt ◽  
Scott E. Goodman
Keyword(s):  
Bering Sea ◽  
Control Rules ◽  
Tanner Crab ◽  
Chionoecetes Bairdi ◽  
Harvest Control Rules

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.

Sign in / Sign up

Export Citation Format

Share Document