Bras d’Or Lake – Fishing
The Bras d’Or Lake
The Bras d’Or Lake comprises an irregular brackish body of water covering 260 km2. The western part of the lake is generally shallow, with the sheltered bays of West Bay, Denys Basin, and Whycocomagh Bay. Three long narrow arms extend to the east: East Bay, St. Andrews Channel, and Great Bras d’Or Channel. Great Bras d’Or Channel connects to the open sea in the Sydney Bight across a depth of at least 8 m. Little Bras d’Or Channel is a 6-m deep, sinuous estuary that connects St. Andrews Channel with the sea. A narrow isthmus at St. Peters separates the southern part of Bras d’Or Lake from St. Peters Bay.
Fishing
The Bras d’Or Lake is one of the areas where the American Oyster is found, owing to warmer water temperatures suitable for growth and reproduction. A significant population of sand shrimp, a southern species, exists here. The polychaete fauna is Virginian in character but also includes some arctic-boreal species. A varied fish fauna includes Blueback Herring, Black-spotted Stickleback, and a southern population of Greenland Cod. A feral population of Rainbow Trout is present in the lake as well. These support strong populations of Great Blue Heron, Double-crested Cormorant, and Bald Eagle.
Oysters, Lobsters, and other species have been harvested by Mi’kmaq people for hundreds and hundreds of years. In 1995, the band decided to incorporate as a cooperative to begin harvesting oysters and selling them nationally and internationally.
Tagging Lobsters
Between the Chapel Island Band and its residents, they own or lease oyster beds, snow crab quota, and lobster quota.
| The Chapel Island First Nation community on the south-eastern shore of the Bras d’Or Lakes is surrounded by a plentiful supply of healthy and marketable seafood. The St. Peter’s canal and locks connects the Bras d’Or Lakes to the Atlantic Ocean which provides great fishing opportunities.The Apaqtukewaq Fisheries Co-op (AFC) offers a quality cold water product and enforces stringent quality control measures to ensure that their own brand of Mntmu’k Bras d’Or Lake Oysters continue to enjoy an excellent reputation in restaurants around the world.
First Nations, DFO collaborate on Bras d’Or Lakes research Cape Breton’s famed Bras d’Or Lakes combine beauty and commercial importance, and hold cultural significance especially for the five neighbouring First Nations. With modern pressures threatening the delicate ecosystem, Aboriginal and Department of Fisheries and Oceans (DFO) researchers are analyzing how the lakes work, and making plans to protect them. Partly fresh, partly salt, the Bras d’Or Lakes cover 1,100 square kilometers, in a varied seascape of bays and peninsulas, narrow passages, and many coves, inlets, and islands. The main connection to the sea, the narrow Great Bras d’Or Channel, attenuates the tides and limits water exchange with the Atlantic Ocean. “The lakes are warmer than the ocean in summer, with limited tidal range; they have a distinct ecosystem; and they’re altogether a special place,” says physical oceanographer Gary Bugden of the Bedford Institute of Oceanography (BIO) in Halifax, Nova Scotia. Mr. Bugden co-ordinates a coalition of Department of Fisheries and Oceans (DFO) researchers working with other agencies and Native organizations to figure out the Bras d’Or Lakes aquatic system. Fishing for Smelt The confined and tranquil waters that attract boaters, visitors, and tourism and other development are ill-equipped to deal with siltation and other threats, including sewage pollution that caused the closure of some shellfish grounds. Aboriginal people, who make up 30 per cent of the surrounding population, called attention to the growing problems, and crystallized the multi-agency effort to protect the lakes. The Eskasoni First Nation, on the East Bay of the Bras d’Or Lakes, has built up research capability over the last two decades. The Eskasoni Fish and Wildlife Commission (EFWC) stimulated the 1999 establishment, also at Eskasoni, of the Unama’ki Institute of Natural Resources. The UINR represents all five First Nations in Cape Breton (Unama’ki, in the Mi’kmaq language), and deals with a wide range of resource issues, not just on the lakes but in forestry, plant and animal studies, and other matters. Deploying green crab traps on the Bras d’Or Lakes. (Photo courtesy Dr. John Tremblay) The UINR offers training to interns and a natural-resource officer program. Both the UINR and the EFWC rely not only on standard western science but also on traditional ecological knowledge. The twinned approaches foster what one elder has termed “two-eyed seeing.” The EFWC, which has longstanding links with DFO science and management, in 1996 brought together First Nations, DFO representatives, and others in an Ecological Research and Monitoring Workshop. Efforts begun at that time gelled in 1999, with a program known as SIMBOL (Science for Integrated Management of the Bras d’Or Lakes), co-ordinated by Mr. Bugden. Biologists, oceanographers, and hydrographers from BIO, as well as personnel from Natural Resources Canada (NRCan), Environment Canada, and private companies, began working with First Nations members on an array of projects. DFO made available the 65-foot research vessel Navicula. Research started from the bottom up, with sonar surveys of the lake floor and analysis of bottom habitat and sediments. Other studies looked at oceanographic processes, plankton production, and the general ecological web of the lakes. Lobsters in the lab: DFO’s Ron Duggan with Kara Paul and Shelley Denny, tagging lobsters. (Photo courtesy Dr. John Tremblay) On the fisheries side, Dr. John Tremblay of BIO has worked with biologists Kara Paul and Shelley Denny and other First Nations personnel to study Bras d’Or lobsters, which are less abundant than those on the outer coast. Possible causes include low salinities, limited food, and a scarcity of suitable habitat. But in the lakes, even good habitat seems to support fewer lobsters than it should. The research suggested some potential for enhancement, especially in East Bay, by creating more shelter for juveniles. Consequently, the UINR organized the placing of 324 concrete blocks on the bottom, and will monitor the artificial-reef results. As in many other Canadian waters, invasive species have become a problem. The green crab, which preys on oysters and other bivalves, was already present in waters off mainland Nova Scotia, and moved into the Bras d’Or Lakes by the early 1990’s. Dr. Tremblay and First Nations researchers have studied the distribution and abundance of the green crab. There may be prospects for a commercial fishery that would reduce their numbers. Collaborative work on oysters has increased in recent years. For example, BIO scientists have worked with the EFWC and UINR to map the DNA of Bras d’Or Lakes oysters, and to develop a broodstock resistant to the MSX parasite, another invasive species. As well, scientist emeritus Dr. René Lavoie, who has long worked with Native collaborators, is taking part in a UINR project to restore oyster habitat in the lakes’ Denys Basin. Besides working with DFO (which helps support UINR through the Aboriginal Aquatic Resources and Ocean Management Program), the First Nations of the Bras d’Or area have formed partnerships with other agencies and groups, including the province of Nova Scotia, Cape Breton University, and municipalities, industry, and non-government organizations. Projects include Atlantic salmon protection, moose management, and other aspects of conservation and enhancement. One such effort resulted in a Transport Canada decision to forbid sewage discharge from boats on the lakes. Meanwhile, DFO’s Oceans and Habitat sector and other agencies are working together in a Collaborative Environmental Planning Initiative (CEPI), initiated by First Nations, that will develop an overall management plan, marine and land-based, for the future. Pitu’paq, the Mi’kmaq name for the Bras d’Or Lakes, means “flowing into oneness,” and the collaborative efforts inspired by the First Nations of Unama’ki are living up to the name. |
Green Crab Fishing
Geology and Seabed Morphology
There is no direct information on the bedrock geology beneath the Bras d’Or Lake. Extrapolation of observations along the shoreline and in the adjacent lowlands suggests that the lakes are largely underlain by Carboniferous Windsor Group sedimentary rocks, principally shale, sandstone, gypsum, and salt. A large negative gravity anomaly beneath West Bay suggests the presence of salt.
The Bras d’Or Lake occupies a regional lowland that developed in soft Windsor Group rocks before the Quaternary glacial period. Some deepening of the floor of the lake might have resulted from solution collapse of gypsum, but the main excavation of the very deep channels (280 m in St. Andrews Channel, 81 m in East Bay) appears to be a consequence of glacial erosion, probably over hundreds of thousands of years through the Quaternary. The cliffs bordering the lake are unusual because they preserve organic sediments predating the last glaciation that provide a window on earlier environmental conditions.
Crab
The morphology of the lake floor is influenced by the deposition of glacial till and pre-glacial silty muds that occurred during the last retreat of ice. The extensive drumlin field of southern Cape Breton Island extends across much of the central and western parts of the lake. Remaining ice appears to have been centred on the western part of Bras d’Or Lake, and a series of recessional moraines are visible on the floors of East Bay, St. Andrews Channel, and Great Bras d’Or, with pre-glacial silty muds thickening eastward.
Oceanography
Bras D’Or Lake is a fiordal system connected to the sea via two restricted channels. This restricted access causes the tidal amplitude to be reduced and, in combination with high freshwater runoff, results in relatively low salinity. The salinity of surface waters vary from about 29 p.p.t. at the entrance to Great Bras d’Or, to 25-26 in the deep water basins, to 20-21 in surface waters at the east end of East Bay. Lower salinities are found in sheltered bays off the larger rivers that drain into the western part of the lake. A thermocline and halocline develop at 10-20 m during the summer and probably deepen in the winter. Measurements of oxygen and salinity indicate that lake water is a mix of Atlantic water and local runoff, with an insignificant contribution from groundwater. Most of the lake is covered by ice in winter, with temperatures warming by more than 10°C from May to July.
The Bras d’Or Lake shows a typical estuarine circulation, with brackish near-surface waters tending to flow seawards, and deep saline water tending to flow into the lake. Tidal currents in the entrance to Great Bras d’Or are normally 4-5 knots but reach 6 knots or more when the lake level is elevated by up to 30 cm during spring runoff or after northeast gales. Non-tidal flows in the lake proper tend to be very weak but in narrow passages between basins may reach about one knot. The long fetches in the eastern arms of the Bras d’Or Lake allow sizeable waves and swells to develop during northeast gales
Plants
Seaweed species are similar to those of the Gulf of St. Lawrence. In both areas, seaweeds usually found in intertidal zones occur only in deeper water as the result of winter ice activity, and the rockweed Ascophyllum nodosum is found subtidally. Sheltered bays have marginal salt to freshwater marsh vegetation
About the Bras d’Or Lakes
| The Bras d’Or Lake comprises an irregular body of water covering 260 square kms. The Bras d’Or Lake offers an ever-changing panorama of woodlands, farms and villages, and are ideal for walking, biking and bird watching. The region is a major nesting area for bald eagles, and these impressive birds can often be seen soaring aloft or perched on shoreline trees.The Bras d’Or Lakes’ unique tidal waters create a rich ecosystem that supports a dazzling array of wildlife. Hundreds of pairs of bald eagles nest along the lakeshore and in the surrounding countryside. White-tailed deer, osprey, fox, and raccoons are also frequently seen.
The Bras d’Or Lakes are a traditional home of Nova Scotia’s native Mi’kmaq, and the Mi’kmaq language and culture are still evident today in the four reserves along its shores including Chapel Island in St. Peter’s inlet. Beautiful Clothing worn by the Mi’kmag of Cape Breton |
Cultural Environment
Most cultural use of the Bras d’Or Lake is related to shore-based activities. The whole area is of high cultural significance to the Mi’kmaq people and is a centre of Scottish heritage in Nova Scotia. The marine area has some natural fisheries, but aquaculture for oysters and salmonids is most important. The area is important for recreational boating.





















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