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Rescue of a Bryde's Whale Balaenoptera Edeni Entrapped in the Manning River, New South Wales: Unmitigated Success Or Unwarranted Intervention?

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Rescue of a Bryde's Whale Balaenoptera Edeni Entrapped in the Manning River, New South Wales: Unmitigated Success Or Unwarranted Intervention? Rescue of a Bryde's Whale Balaenoptera edeni entrapped in the Manning River, New South Wales: unmitigated success or unwarranted intervention? David Priddel' and Robert Wheeler1 INS\.\' National Parks and Wildlife Service, P.O. Box 196'7, HUI-stville.New South Walcr, 2220 ABSTRACT In August 1994 a Btyde's Whale Balaenoptera edeni entered and became entrapped in the Manning River, New South Wales. The individual was an immature male of the rare pygmy form of Btyde's Whale: it was 10.3 rn long and weighed approximately 7.7 tonnes. The whale remained in the Downloaded from http://meridian.allenpress.com/australian-zoologist/article-pdf/30/3/261/1475562/az_1997_002.pdf by guest on 30 September 2021 river for 100 days, during which time observations were made of its movements, diving habits, feeding behaviour and body condition. Apart from the risk of stranding, the entrapped whale also faced the potential threats of starvation, entanglement in fishing nets, collision with boat traffic, and exposure to low salinity and high acidity. In view of these threats, a rescue bid was launched to return the whale to the ocean. Five rescue~~~~ attemots ~ were made. the last culminated in the whale beina successfuilv .. ,~ ~ tnwerl --~-sea ~ ~ --~----- -- - ~~ ~ ~ ~ ~ ~- to and released several kilometres offshore. Desoite-~--- its -- emaciated ~~ condition ihe whale was rescdd from the r ver ~eforetne onset of I heath or irreparaoe physooglca damage. Tne wale snam array slrongly on reease, and ts cnances of sLrv.va appeareo to De goo0 Tne success ot the operat on togetner w th tne pnys ca slate ol tne an ma1 on re ease ,Lst fy the aeasson taken to mom! such an ambitious rescue bid, even though such action was itself life-threatening. INTRODUCTION whale was successfully manoeuvred on to a pontoon, towed out to sea and released several Bryde's Whales Balaenoptera edeni occur in kilometres offshore. The whale had been tropical, subtropical and warm temperate waters entrapped in the Manning River for 100 days, around the world (Cummings 1985), often near during which time observations were made of shore in areas of high productivity (Leathemrood its movements, diving habits, feeding behaviour and Reeves 1983). In Australian waters they are and body condition. most often observed north of 40"s (Watson 1981; Leatherwood and Reeves 1983). Reported Since the rescue, debate has ensued regarding strandings, as shown in Figure 1, have been the need for such intervention and the worth of confined to the southern and southeastern such operations. This paper examines the coast of the Australian mainland (Dixon 1970; incident in relation to similar historical events, Llewellyn el a/. 1994; Marine Mammal Strandings discusses the potential threats to the whale in Database, Biodiversity Group, Environment the river, and reports on the biological and Australia). behavioural information gathered. The On 16 August 1994 a 10.3 m long Bryde's findings, and the benefits of hindsight, are used Whale entered the Manning River on the central to appraise the decision to mount a rescue bid. coast of New South Wales. The whale remained entrapped in the river for 100 days, apparently THE MANNING RIVER unable to negotiate its way back out to sea through the shallow, narrow channel at the river The Manning River is a short coastal river, mouth. In view of the potential threats to the rising in the foothills of Mount Barrington in the Great Dividing Range about 150 km from whale whilst in the river (see below), a bid was made to rescue the whale and return it to the the coast and meandering for its final 50 km ocean. across a coastal plain until forming an estuary, out of which it enters the Pacific Ocean. It is a Several rescue strategies were tried. The first typical estuarine river, as described by Morrisey was to drive the whale downstream, through the (1995), of which there are many on the New mouth of the river, across the bar and out to sea. South Wales coast. Several factors influence the When this failed, a second strategy aimed to form of these estuaries. Rainfall in Australia is capture the whale then tow it to sea on an erratic, and river flows are highly variable and inflatable pontoon. Three attempts to capture unpredictable. The ocean swell is consistently the whale were made; all failed. On 24 November substantial and virtually parallel to the coast. As 1994, before another capture attempt could be a result, estuaries of this kind tend to have initiated, the whale grounded on a sand shoal convoluted and shallow passages, a bar across close to the river mouth. While stranded, the the mouth and a narrow channel, the location March 1997 Australian Zwlogist 30(3) 261 less than 20 000 ML (New South Wales Depart- ment of Land and Water Conservation, unpubl. data). Discharge volumes for the corresponding periods in 1990-93 were substantially greater: up to 140 000 ML. Low river flows in recent times resulted in the constriction and further redirection of the channel in Harrington Inlet. The channel was not expected to widen or deepen until the next major river flow. ENTRY OF THE WHALE INTO THE RIVER At approximately 1300 h on 16 August 1994, Downloaded from http://meridian.allenpress.com/australian-zoologist/article-pdf/30/3/261/1475562/az_1997_002.pdf by guest on 30 September 2021 the whale grounded on a sandbar at the mouth of the Manning River (Fig. 3). The tide was l.l m, peaking at 1.65 m around 1600 h. The whale .Fig. 1. Australia, showing locations of reported strandings of remained grounded on the sandbar until, on the Bryde's Whales. Key: l, Corny Point (1883); 2, Cape Banks rising tide, it refloated and was swept by waves (19a5); 3, Manning River Quly 1948); 4, Corio Bay (July 1968); 5, Port Wakefield (April 1972); 6, Younghusband off the sandbar into the river. It ran aground Peninsula (anuary 1982); 7, Great Sandy Strait (October again on a sand shoal approximately 2 km 1982); 8, Valla Beach (October 1983); 9, Red Cliff Point upstream (Fig. 3) where it floundered for 20 min. (September 1985); 10, North Brighton (July l986); 11, before again being refloated by the incoming Hayward's Beach (November 1989); 12, Manning River (August to November 1994). tide. Minimum water depth between the heads when the whale crossed was 4.6 m on the of which is very changeable. The European northern side and 2.2 m on the southern side settler has, on virtually every such river, (Hydrographic Office, Royal Australian Navy, endeavoured to deepen and stabilize the passage unpubl. data). Dy varlous measures. Local fishers followed the whale upstream for The Manning River estuary is shown in several kilometres before it disappeared. It Figure 2 and has two entrances to the ocean. was next sighted the following morning in the The main channel flows to Harrington Inlet South Passageat the mouth of Blackfords Bay (31'53'S; 152'41'E) and the smaller South approximately 23 km upstream (Fig. 2). The Channel and Scotts Creek flow to Farquar Inlet whale remained in this vicinity for several weeks, (31'57'S; 152'36'E). Harrington Inlet, where rarely venturing upstream of Dumaresq Island extensive sand shoals extend almost 3 km or downstream of Blackfords Bay. upstream from the river mouth, is the major Why the whale entered the river is unclear, passage for boat traffic entering or leaving the although it appeared to be due to miscalculation river. The narrolv channel, which has been rather than intention. A local fisher who witnessed redirected by a long training wall (Fig. 3), is the event believed that the whale got into convoluted and shallow and can be difficult to difficulties while feeding at the river entrance navigate. where schools of young Tailor Pomatomussalt- The whale entered the Manning River during atrix were plentiful around the time of the a period when protracted drought conditions incident. The whale ran aground while feeding prevailed over most of eastern Australia. The in shallow water and, once grounded, could not Manning River catchment was severely affected, turn around. It was subsequentlyswept over the and was drought declared from August to shoals and into the river by breaking waves. A November 1994 (New South Wales Department pod of Bottlenose Dolphins Tursiops truncatus of Agriculture, unpubl. data). The annual rain- was also present nearby and preceded the whale fall at Taree during 1994 was 555 mm, 46% of upriver. They too appeared to be hunting the long-term (1O9-year)average (Meteorological shoaling fish. Records Database, Australian Bureau of Meteor- ology). The I l0 mm of rain that f'ellduring the THE RESCUE OF THE WHALE four-month period encompassing the whale's FROM THE RIVER entrapment (August to November) was 39% of The Drive the long-term mean for this period. River flows were substantially reduced because of the The first strategy to remove the whale from protracted drought. Total stream discharge the river was to drive the animal downstream by from August to November 1994, as measured at producing a noise barrier created by banging Killawarra (32 km upstream from Taree), was metal pipes suspended in water from a flotilla 262 AustralianZoologist 30(3) March 1997 Downloaded from http://meridian.allenpress.com/australian-zoologist/article-pdf/30/3/261/1475562/az_1997_002.pdf by guest on 30 September 2021 Fig. 2.Th'e lower reaches of the Manning River showine locations mentioned in the text Pacific Ocean Flg. J. Harrington Inlet at the mouth of the Manning River showing sites of groundings of the entrapped whale. Heavy stippling, land; light stippling, sand shoals; circles, sites of grounding on 16 August 1994; triangle, site of grounding on l3 September 1994; square, site of grounding on 24 November 1994.
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