Weekly seminar series
UMass Dartmouth's School for Marine Science & Technology hosts weekly seminars on topics related to research and policy development, fisheries, coastal preservation, ocean modeling, underwater robotics, climate change, and other related fields. The seminars are free and open to the public. Presentations are given by guest speakers and scientists -- many who collaborate with SMAST faculty, staff, and students on cooperative research projects. Supporters and potential collaborators in industry, federal and state agencies, and others are welcome to attend.
Department of Fisheries Oceanography - PhD Dissertation Proposal Defense
The School for Marine Science and Technology Department of Fisheries Oceanography PhD Dissertation Proposal Defense "Standardized Catch Rates to Support Data-limited Stock Assessment and Fishery Management" by Alexander C. Hansell advisor Dr. Steven Cadrin Monday, May 7, 2018 11:00 am SMAST East, Rooms 101/102 836 S. Rodney French Blvd, New Bedford, MA Abstract Understanding population dynamics is essential for implementing effective conservation and management of coastal sharks. Fisheries-independent surveys can offer valuable information for such data-limited situations. A12-year (2004–2015) standardized, shallow water longline survey was conducted monthly in the coastal waters of Bimini, Bahamas. Each monthly survey comprised five longline sets, totaling 75 hooks, with a soak time of 24 h. A total of 770 sharks from nine species were caught over the course of the study, with tiger (Galeocerdo cuvier), nurse (Ginglymostoma cirratum), blacktip (Carcharhinus limbatus) and lemon (Negaprion brevirostris) sharks comprising 95% of the catch. Most tiger (87%), nurse (62%), blacktip (67%), and lemon (82%) sharks were of immature lengths. A greater number of captured tiger (77%) and blacktip (66%) sharks were female, while nurse (55%) and lemon sharks (73%) were predominantly male. Poisson generalized additive models were used to analyze local abundance trends and examine how catch rates were influenced by year, month, location, tide, hour of capture, and lunar cycle. Seasonal trends indicate greater catches of the nurse, blacktip and lemon sharks during the summer months. Annual trends indicated relatively stable catch rates for the tiger, blacktip and lemon shark. Nurse shark catch rates were highly variable during the survey. Results from this study improve our understanding of the coastal shark assemblage in Bimini, Bahamas, and provide important local abundance trend information that could be beneficial for conservation and regional assessments. For additional information please contact Christine Fox at email@example.com.
Department of Fisheries Oceanography - MS Thesis Defense
The School for Marine Science and Technology Department of Fisheries Oceanography MS Thesis Defense "A Video Trawl Survey for Atlantic Cod (Gadus morhua) in New England" by Nicholas M. Calabrese advisor Dr. Kevin D. E. Stokesbury Monday, May 14, 2018 9:00 am SMAST East, Rooms 101/102 836 S. Rodney French Blvd, New Bedford Abstract: The Gulf of Maine Atlantic cod stock has been declining over recent decades restricting the commercial quota, and inhibiting fisherman’s ability to reach their quota of other healthy stocks in the Northeast multispecies groundfish fishery. In recent years there has been a disconnect between the observations of the fisherman, who are catching large amounts of cod, and the fisheries-independent trawl surveys, that are reporting declines in their cod catch indices. In collaboration with members of the fishing industry, we have developed a survey system that utilizes a live feed video camera mounted inside the codend of a demersal trawl net, with the goal of collecting high resolution distribution and abundance data on cod in the Gulf of Maine. This system can be towed with the codend open allowing fish to be recorded, identified, and quantified as they pass through, or closed allowing the collection of biological information and verification of video observations. Three field trials (winter 2016, winter 2017, and spring 2017) were conducted in the Gulf of Maine to survey Atlantic cod (Gadus morhua). To evaluate the use of this survey technique on Gulf of Maine cod we used the 68 hours of video collected and tested the following null hypotheses were tested: (1) the number of cod counted from the video and in the catch are similar; (2) the number of cod counted by sampling the entire video and subsampling the video are similar; and (3) the distribution of cod along the path of each tow is uniform. The first null hypothesis was accepted as there was no significant difference in cod counted in the catch and from the video. A generalized linear model showed that visibility impacted this relationship. The second null hypothesis was accepted as high intensity systematic subsampling produced the similar estimates of total catch. It was also best suited to sampling the aggregated distribution of cod in the tow path. However, for tows with a low density of cod, subsampling may grossly overestimate the number of fish. The third null hypothesis was rejected as the distribution of cod appeared to be aggregated when the tow path was divided into one-minute increments. Overall these results suggest that the video trawl system is an effective method of collecting abundance and distribution data, and could provide a minimally invasive method of surveying aggregations of cod in the Gulf of Maine. In conjunction with the existing fisheries independent surveys, this data could strengthen the assessment of the cod stock. For additional information, please contact Sue Silva at firstname.lastname@example.org.
Time and location
DFO seminars are held on Wednesdays at 3:30 pm in Room 157 of SMAST-Fairhaven (AT&T Building). DFO seminars are also simulcast to Room 204, SMAST-New Bedford. Contact Prof. Gavin Fay at email@example.com for information.
Access seminars remotely
If you are unable to attend the seminars, you may remotely view the seminar in progress. To access the live broadcast,
- visit Echo360 and click “Alternate login.”
- login as firstname.lastname@example.org with the password smastumassd.
- click ALL CLASSES (MAR 700 - 01 - DEOS Seminar or MAR 700 - 02 - DFO Seminar).
- click the green LIVE streaming.
Download the archive of seminar series (PDF) (and associated videos where applicable).