Authors :
Abdalla Y. Kombo; Ali M. Ussi
Volume/Issue :
Volume 9 - 2024, Issue 12 - December
Google Scholar :
https://tinyurl.com/4ecfrnv7
Scribd :
https://tinyurl.com/4zffz3n7
DOI :
https://doi.org/10.5281/zenodo.14546721
Abstract :
The sustainability of octopus fisheries in
Zanzibar is essential for local livelihoods and the broader
economy. This study assessed the impact of different
fishing gears and access methods on the catch rates
(CPUE) of Octopus cyanea in Zanzibar, conducted over a
year at Matemwe and Michamvi on Unguja Island. The
research employed random sampling and quantitative
analysis to explore variations in CPUE influenced by gear
type and fishing site access. Spearfishing showed the
highest variability in CPUE, recording 4.96 kg/fisher/day
at Matemwe and 3.01 kg/fisher/day at Michamvi,
indicating a strong dependency on the fisher's skill and
local conditions. In contrast, metal hooks and sticks
showed more consistent CPUEs across both sites, with
Matemwe fishers using metal hooks and sticks achieving
CPUEs of 2.79 kg and 2.97 kg per fisher per day,
respectively. These gears are suggested as more
sustainable due to their consistent performance and
reduced ecological impact. Significant differences were
also observed based on the methods of site access. At
Michamvi, paddling fishers yielded a higher CPUE of
2.95 kg/fisher/day compared to 2.54 kg/fisher/day for boat
fishers. Conversely, at Matemwe, fishing boats were more
effective, achieving a CPUE of 4.63 kg/fisher/day against
2.56 kg for paddling. This illustrates the varying impacts
of access strategies on sustainability and efficiency
between sites. The findings insist on the need for detailed
fishery management that accounts for gear types and
access methods, essential for promoting ecological
balance and economic growth within Zanzibar’s blue
economy. This research offers valuable insights for other
fisheries, highlighting the importance of tailored
management practices adapted to specific local
conditions.
Keywords :
Fishing Gear, Means of Fishing Site Access, Octopus Cyanea, Catch Rate, Zanzibar.
References :
- S. Rocliffe and A. Harris, “The status of octopus fisheries in the Western Indian Ocean.,”p. 40, 2016.
- S. Rocliffe and A. Harris, “Scaling success in octopus fisheries management in the Western Indian Ocean .,” in Blue Ventures Conservation, 2015, vol. 44, no. December, p. 24.
- M. Guard and Y. D. Mgaya, “The artisanal fishery for Octopus cyanea Gray in Tanzania,” Ambio, vol. 31, no. 7–8, pp. 528–536, 2002.
- M. C. Jiddawi, N.S.; Öhman, “Marine Fisheries in Tanzania Marine Fisheries in Tanzania,” ambio a J. Hum. Environ. 31(7). p. 518-527, 2002.
- R. Mutayoba. V. & Mbwete, “Is Booming Tourism in Zanzibar Pro-poor? A Micro-economic Impact Analysis Venance Mutayoba 14 and Rose Mbwete 15,” KIVUKONI J., 1(2), pp. 104–120, 2013.
- K. Schreckenberg, G. Mace, and M. Poudyal, Ecosystem services and poverty alleviation: Trade-offs and governance. New York: Routledge, 2018.
- A. I. Hamad and C. A. Muhando, “Feeding habits and diet composition of Octopus cyanea (Gray, 1849) in Zanzibar waters, Tanzania,” West. Indian Ocean J. Mar. Sci., vol. 22, no. 2, pp. 61–73, 2023.
- A. I. Hamad, C. A. Muhando, and B. M. Yahya, “The influence of fishing methods on catch size, catch rate, and size distribution of Octopus cyanea (Gray, 1849) in Zanzibar, Tanzania,” Fish. Res., vol. 281, no. May 2023, p. 107213.
- J. C. Selgrath, S. E. Gergel, and A. C. J. Vincent, “Shifting gears: Diversification, intensification, and effort increases in small-scale fisheries (1950-2010),” PLoS One, vol. 13, no. 3, 2018.
- W. H. H. Sauer, W. Potts, D. Raberinary, J. Anderson, and M. J. S. Perrine, “Assessment of current data for the octopus resource in Rodrigues, western Indian Ocean,” African J. Mar. Sci., vol. 33, no. 1, pp. 181–187, 2011.
- URT, “The United Republic of Tanzania (URT), Ministry of Finance and Planning, Tanzania National Bureau of Statistics and President’s Office - Finance and Planning, Office of the Chief Government Statistician, Zanzibar. The 2022 Population and Housing Census: A,” 2022.
- A. M. Hart, D. Murphy, S. A. Hesp, S. Leporati, and A. Arkhipkin, “Biomass estimates and harvest strategies for the Western Australian Octopus aff. tetricus fishery,” ICES J. Mar. Sci., vol. 76, no. 7, pp. 2205–2217, 2019.
- C. Mtonga, N. Jiddawi, and D. Benjamen, “Recent rise in exploitation of Tanzanian octopuses: a policy and management challenge,” West. Indian Ocean J. Mar. Sci., vol. 2022, no. 1, pp. 107–118, 2022.
- D. R. Goethel et al., Oceans of plenty? Challenges, advancements, and future directions for the provision of evidence-based fisheries management advice, vol. 33, no. 2. Springer International Publishing, 2023.
- M. Mangel, “Scientific inference and experiment in Ecosystem Based Fishery Management, with application to Steller sea lions in the Bering Sea and Western Gulf of Alaska,” Mar. Policy, vol. 34, no. 5, pp. 836–843, 2010.
- P. G. Rodhouse, “Effects of environmental variability and change on cephalopod populations : an Introduction to the CIAC ’ 09 Symposium special issue,” pp. 1311–1313, 2010.
- P. G. K. Rodhouse et al., Environmental effects on cephalopod population dynamics: Implications for management of fisheries, vol. 67. 2014.
The sustainability of octopus fisheries in
Zanzibar is essential for local livelihoods and the broader
economy. This study assessed the impact of different
fishing gears and access methods on the catch rates
(CPUE) of Octopus cyanea in Zanzibar, conducted over a
year at Matemwe and Michamvi on Unguja Island. The
research employed random sampling and quantitative
analysis to explore variations in CPUE influenced by gear
type and fishing site access. Spearfishing showed the
highest variability in CPUE, recording 4.96 kg/fisher/day
at Matemwe and 3.01 kg/fisher/day at Michamvi,
indicating a strong dependency on the fisher's skill and
local conditions. In contrast, metal hooks and sticks
showed more consistent CPUEs across both sites, with
Matemwe fishers using metal hooks and sticks achieving
CPUEs of 2.79 kg and 2.97 kg per fisher per day,
respectively. These gears are suggested as more
sustainable due to their consistent performance and
reduced ecological impact. Significant differences were
also observed based on the methods of site access. At
Michamvi, paddling fishers yielded a higher CPUE of
2.95 kg/fisher/day compared to 2.54 kg/fisher/day for boat
fishers. Conversely, at Matemwe, fishing boats were more
effective, achieving a CPUE of 4.63 kg/fisher/day against
2.56 kg for paddling. This illustrates the varying impacts
of access strategies on sustainability and efficiency
between sites. The findings insist on the need for detailed
fishery management that accounts for gear types and
access methods, essential for promoting ecological
balance and economic growth within Zanzibar’s blue
economy. This research offers valuable insights for other
fisheries, highlighting the importance of tailored
management practices adapted to specific local
conditions.
Keywords :
Fishing Gear, Means of Fishing Site Access, Octopus Cyanea, Catch Rate, Zanzibar.