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Fisheries and Marine Service Data Report No. 77

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Fisheries and Marine Service Data Report No. 77 1 DFO Library/Millièque 12035879 A Summary of Sablefish Tagging r Studies Conducted During 1977 by the Pacific Biological Station R. J. Beamish, C. Wood, and C. Houle Department of Fisheries and the Environment Fisheries and Marine Service Resource Services Branch Pacific Biological Station Nanaimo, British Columbia V9R 5K6 June 1978 'Fisheries & Marine Service Data Report No. 77 u. QH 90.5 C33 no. 77 JC Fisheries and Marine Service Data Reports These reports provide a medium for filing and archiving data compilations where little or no analysis is included. Such compilations commonly will have been prepared in support of other journal publications or reports. The subject matter of Data Reports reflects the broad interestsand policies of the Fisheries and Marine Service, namely, fisheries management, technology and development, ocean sciences and aquatic environments relevant to Canada. Numbers 1-25 in this series were issued as Fisheries and Marine Service Data Records by the Pacific Biological Station, Nanaimo, B.C. The series name was changed with report number 26. Data Reports are not intended for general distribution and the contents must not be referred to in other publications without prior written clearance from the issuing establishment. The correct citation appears above the abstract or each report. Service des pêches et des sciences de la mer Rapports statistiques Ces rapports servent de base à la compilation des données de classement et d'archives pour lesquelles il y a peu ou point d'analyse. Cette compilation aura d'ordinaire été préparée pour appuyer d'autres publications ou rapports. Les sujets des Rapports statistiques reflètent la vaste gamme des intérêts et politiques du Service des pêches et de la mer, notamment gestion des pêches, techniques et développement, sciences océaniques et environnements aquatiques, au Canada. Les numéros 1-25 de cette série ont été publies à titre de Records statistiques, Service des pêches et de la mer, par la Station biologique du Pacifique, Nanaimo (C.-B.). Le nom de la série a été modifie à partir du numero 26. Les Rapports statistiques ne sont pas préparés pour une vaste distribution et leur contenu ne doit pas être mentionné dans une publication sans autorisation écrite préalable de l'établissement auteur. Le titre exact paraît au haut du résumé de chaque rapport. Cover design by Christine Rusk Fisheries and Marine Service Data Report 77 June 1978 A SUMMARY OF SABLEFISH TAGGING STUDIES CONDUCTED DURING 1977 BY THE PACIFIC BIOLOGICAL STATION by R. J. Beamish, C. Wood, and C. Houle Department of Fisheries and the Environment Fisheries and Marine Service Resource Services Branch Pacific Biological Station Nanaimo, British Columbia V9R 5K6 Q 4 - ii- oto s' c,3 -Kid 7/ (c) Minister of Supply and Services Canada 1978 Cat. no. Fs 97-13 ISSN 0701-7634 - iiL - ABSTRACT Beamish, R. J., C. Wood, and C. Houle. 1978. A summary of sablefish tagging studies conducted during 1977. Fish. Mar. Serv. Data Rep. 000: 000. A sablefish tagging program was initiated by the Groundfish program in 1977 to determine if sablefish found in Canadian waters could be considered to be resident in these waters and to examine movements of stocks near proposed international boundary areas. During 1977, 10,665 sablefish were tagged with a Floy FD-68 anchor tag, approximately 10% of all fish tagged received a second "sew on" type tag and almost all fish tagged off Vancouver Island received an intraperitoneal injection of oxytetracycline to provide a "time mark" on scales and bone. Tagging was conducted off the west coasts of the Queen Charlotte Islands during July 6-20 (5,159 tags) and Vancouver Island from September 3-27 (5,506 tags). By December 31, 1977, 134 tags had been recovered, all from the earlier Queen Charlotte Island tagging cruise. This report summarizes the results of the 1st yr of tagging. Key words: Blackcod, tagging, migration, age determination. ■ RESUME Beamish, R. J., C. Wood, and C. Houle. 1978. A summary of sablefish tagging studies conducted during 1977. Fish. Mar. Serv. Data Rep. 000: 000. Un programme de marquer les morues noires etait initiate par le programme des poissons du fond en 1977 pour déterminer si les morues noires trouvaient aux eaux cannadiennes, pouvraient gtre considérer des residents de ces eaux, et pour examiner les bougements des peuples prés des reàionnes de la fronti1re internationale proposed% Pendant 1977, 10,665 des morues noires etaient marqués avec un floy FD-68 "marque d'anchor", a peu prs de 10% de tous les poissons marqué% ont reçu une deuxieme type de marque qui s'appelle "sew on" et presque tous les poissons marques ont rev une injection entre-peritoneale de l'oxytetracycline pour proviser un "indicateur de temps" dans les deailles et les argtes. Le marquage dtait conduit des cotes ouests des Iles de Queen Charlotte pendant le 6-20 juillet (5,159 marques) et de l'Isle de Vancouver du 3 au 27 septembre (5,506 marques). Le 31 décembre, 1977, 134 marques avaient été recouvrés, tous du voyage aux Isles de Queen Charlotte avant de celui-ci. Ce rapport est un résumé de la pAmiere année du marquage. Mots cléS: Morues noire, marquage, emigration, détermination de l'âge. INTRODUCTION The primary purpose of the sablefish (Anoplopoma fimbria) tagging program was to determine if sablefish found in Canadian waters could be considered to be resident in these waters. Sablefish tagging studies in other areas (Low et al. 1976) have suggested that most sablefish do not undergo extensive migrations; however, very little information is available from the area off Canada's west coast. If extensive migrations were not observed, as might be expected, it was of interest to examine the more localized movement especially in the vicinity of the international boundary areas. The tagging experiments were also designed to test the durability of the primary tag used and provide confirmation of our methods of age determination. This report summarizes tagging studies for 1977. It is intended that these studies be repeated in 1978 and a similar report will be issued at the end of 1978. SAMPLING AND SET INFORMATION All tagged blackcod were measured for fork length and any apparent abnormal conditions such as a torn jaw noted. Dead fish were sampled for fork length, sex, maturity, stomach contents, and an otolith sample was collected for age determination. In a preliminary study in which otoliths, sections of all fins, and scales were examined for age determination it was concluded that no structure was satisfactory, however, of all the structures examined the otolith was considered the best structure for the presence and prominence of a growth pattern. An effort was also made to identify and measure incidental catches of other species of fishes and invertebrates. A list of common and scientific names of all fishes captured including the three species of crabs is presented in Appendix 1. Expendible bathythermograph temperature readings (Appendix 2) were also taken routinely as part of the cooperative program with Percy Wickett, to establish and monitor over the long term, a series of stations located in major fishing grounds. For each set the location, time of setting and finishing, bottom depth, water, and wind conditions were recorded (Appendix 3). TAGGING AND FISHING METHODS Sablefish were tagged along the west coast of the Queen Charlotte Islands between Tasu Sound and Rennel Sound (Fig. 1) and off the west coast of Vancouver Island from Cape Flattery to Cape Cook (Fig. 1). Off the Queen Charlotte Islands, 5,226 sablefish were captured of which 5,159 were tagged and 511 or approximately 10% of these were double tagged. All fish were captured using collapsible rectangular wire traps of approximately 85 cm2 by 2.4 m long equipped with two tunnels and baited with -2 10 lb of frozen herring. The 110 ft longliner, LINDA, skippered by Mr. Swen Jerstad was chartered for this operation. Set locations are shown in Fig. 2 and catch statistics including depths, soak time, and number of traps are included in Table 1. Soak time was considered to be the time that had elapsed between setting the last trap and handling the first trap of each string. Depth ranges were approximated by recording the depth of the first and last trap set using an echo sounder. In general, traps were hauled early in the morning and reset further north that afternoon. About 38 traps or 2 strings were hauled each day as this provided a steady and uninterrupted supply of fish for approximately 6-8 hr. Traps were left in the water for approximately 48 hr (soak time) as the fishermen felt that this time provides the most fish of consistent quality. The general fishing method was similar to that described by Low et al. 1976; Webb and Lockner 1973. The crew were experienced with the gear and careful to repair the traps if damage occurred. The crew were also careful when handling fish. Areas and depths chosen were based on the experience of the Captain. The second tagging operation began in September 1977 and was part of a multipurpose sablefish research cruise in which tagging had priority. In this operation the charter vessel ARCTIC HARVESTER was used and equipment was installed to enable the vessel to fish traps. Traps and gear were borrowed for this cruise. Only one of the crew had previous experience trapping sablefish and this person, Captain Wayne Patterson, was hired specifically to advise and assist the captain and crew of the HARVESTER. Despite the sincere efforts of all concerned this operation was not as efficient as that of the LINDA. Traps could not always be set in the desired locations and soak times varied as a result of other vessel problems.
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