Oregon Commercial Dungeness Crab Fishery PDF Download

Author: Rod Kaiser
Publisher:
ISBN:
Category : Dungeness crab fisheries
Languages : en
Pages : 82

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Author: Rod Kaiser
Publisher:
ISBN:
Category : Dungeness crab fisheries
Languages : en
Pages : 7

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Author: David S. Liao
Publisher:
ISBN:
Category : Crab fisheries
Languages : en
Pages : 26

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Author:
Publisher:
ISBN:
Category : Crabbing
Languages : en
Pages : 161

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Author: Aloysius J. Didier
Publisher:
ISBN:
Category : Dungeness crab fisheries
Languages : en
Pages : 72

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Author: Pacific Marine Fisheries Commission
Publisher:
ISBN:
Category : Crab fisheries
Languages : en
Pages : 356

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Author: Kaety Hildenbrand
Publisher:
ISBN:
Category : Dungeness crab
Languages : en
Pages : 21

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"Oregon's fishing community is concerned about the potential effects that wave energy conversion devices could have on Dungeness crab movement, behavior and harvests. Though crabbing has been a mainstay of West Coast economies for decades, little information has been collected or analyzed on adult Dungeness crab movement, in general, and for the Oregon Coast, specifically. To help begin addressing this critical information gap, The Oregon Wave Energy Trust (OWET), the Oregon Dungeness Crab Commission (ODCC) and Oregon Sea Grant added value to a planned baseline study conducted by H.T. Harvey and Associates. Crabs collected for the baseline study were tagged after they were measured and before they were returned to the ocean. Commercial crabbers later returned the tags, and were rewarded for collaborating in the project. Methods: Legal sized male crabs (6 1/4" carapace width) were tagged at three locations near Reedsport, Oregon, in October and November of 2009. A total of 2788 tags was deployed and crabs were recaptured in the commercial crab fishery. Tags were returned with recapture locations to Oregon Sea Grant and a $20/tag reward was provided. Results: Out of 2788 tagged crabs released, 952 crabs were recaptured and the tags returned to Oregon Sea Grant. A total of 626 tags was returned with location data of sufficient detail for analysis. The overall return rate of 34.15% is notably high for a mark-recapture study; however, this is not unreasonable because a high percentage of male crabs is harvested during each season. Additionally, a historic Oregon crab tagging study found a similar return rate. Crabs travelled distances ranging from 0.27 km to 90.68 km (Table 1). 65% of crabs traveled less than 20 km, 77.7% of crabs traveled less than 30km, and 95.5% of crabs traveled less than 50km (Figure 1). Crabs moved primarily in the alongshore direction, with minimal across shelf movement (Figure 4). See enclosed maps of recapture locations. Caveats: Because commercial crabbers target their fishing effort based on past experience, it is likely that some locations had a higher chance of being sampled than others. This sampling bias might inflate the tag recovery rate in those areas and has the potential to skew our results. That said, the tag recapture locations should not be interpreted as reflecting the distribution of fishing effort in the Reedsport study area. The distances reported here represent a minimum distance that the crab traveled. Additional tags were returned with general locations indicating that crabs may be moving as far north as Tillamook, Oregon (approximately 140 miles). It remains unknown to what degree Dungeness crab movements vary from year to year. The findings of this study should be treated as preliminary rather than definitive. Additional studies are needed to fully characterize adult Dungeness crab movements in Oregon's coastal waters."--Executive summary.

Author: Kenneth D. Waldron
Publisher:
ISBN:
Category : Dungeness crab
Languages : en
Pages : 43

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Results of studies beginning in 1947 on the biology of the Dungeness crab (Cancer magister) in Oregon coastal waters are reported. A review is made of the history of the fishery with regard to trend of the catch by magnitude, area, and season; the development and conduct of the fishery itself; and the regulations governing the fishery. The first reported commercial crab landings in Oregon were 6,628 pounds in 1880. The fishery expanded slowly until 1933 after which the catch rose sharply to a peak of about 11 million pounds in 1943. Landings in recent years have fluctuated between 6 and 11 million pounds from a commercial fishery which is carried out along the major portion of the Oregon coast. During the period 1947-50, 6,249 tagged crabs were released in offshore and bay waters of Oregon and 34.6 percent of the tags were subsequently recovered. The average movement of 1,042 recoveries of crabs released in offshore waters, as measured by the distance from the tagging site, was 8.3 miles (range 0-133 miles) in 80 days. For crabs released within bays, 606 recoveries averaged a minimum distance traveled of 4.2 miles (range 0-81 miles). Fifty-seven percent of the recoveries of offshore releases and 84 percent of the recoveries of bay releases were made within 4 miles of the respective tagging sites. Over 90 percent of the recoveries of offshore releases were made within 6 months, although 3 crabs were out more than a year with 1 at liberty 878 days. Tagged crabs moved from offshore to bays, from bay to bay, and from bays to offshore. There was no significant difference in percentage recovery for crabs with or without missing appendages. Egg-bearing female crabs are present in offshore waters during the period October to March, inclusive. Larval crabs assumed to be C. magister were observed in offshore waters from April to July, inclusive. Considerable variation in early growth of post larval crabs was observed in laboratory experiments. The amount of growth of crabs between 6.4 and 146.0 mm., as observed by measuring them before and after molting, increases until a shoulder width of about 95 mm. is reached. The increase with each subsequent molt thereafter remains relatively constant. Macroplankton-eating fishes feed upon free swimming crab larvae. Adult crabs up to at least 114 mm. in shoulder width are preyed upon by voracious fish such as ling-cod (Ophiodon elongatus), the great marbeled sculpin (Scorpaenichthys armoratus), wolf eel (Anarrhichthys ocellatus), halibut (Hippoglossus stenolepis), and some of the rock fishes of the genus Sebastodes.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 1

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Author: United States. Congress. House. Committee on Resources. Subcommittee on Fisheries Conservation, Wildlife, and Oceans
Publisher:
ISBN:
Category : Law
Languages : en
Pages : 120

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