The KwaZulu-Natal Boat Launch Site Monitoring System: A novel approach for improved management of small vessels in the coastal zone

Mann, B.Q.; Maggs, JQ; Khumalo, Musa C.; Khumalo, Derrick; Parak, Omar; Wood, J.D.; Bachoo, Santosh

doi:10.1016/j.ocecoaman.2014.12.003

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The boat used was a 5.8 m aluminum rigid-hulled inflatable boat (RHIB) with a 2.2 m beam and 0.4 m draft, powered by a single Yamaha 150 HP four stroke outboard (total engine power of 111.8 kW). Boats of this length (< 15 m) are common at the study site and in coastal habitats worldwide 37 , 38 . During the transects, the position of the boat (hereafter ‘source position’) was logged every 5 s using a GPS logger (Holux RCV-3000).…”

Section: Methodsmentioning

confidence: 99%

Impact of small boat sound on the listening space of Pempheris adspersa, Forsterygion lapillum, Alpheus richardsoni and Ovalipes catharus

Wilson¹,

Constantine

Pine

et al. 2023

Sci Rep

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Anthropogenic stressors, such as plastics and fishing, are putting coastal habitats under immense pressure. However, sound pollution from small boats has received little attention given the importance of sound in the various life history strategies of many marine animals. By combining passive acoustic monitoring, propagation modelling, and hearing threshold data, the impact of small-boat sound on the listening spaces of four coastal species was determined. Listening space reductions (LSR) were greater for fishes compared to crustaceans, for which LSR varied by day and night, due to their greater hearing abilities. Listening space also varied by sound modality for the two fish species, highlighting the importance of considering both sound pressure and particle motion. The theoretical results demonstrate that boat sound hinders the ability of fishes to perceive acoustic cues, advocating for future field-based research on acoustic cues, and highlighting the need for effective mitigation and management of small-boat sound within coastal areas worldwide.

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Section: Methodsmentioning

confidence: 99%

Impact of small boat sound on the listening space of Pempheris adspersa, Forsterygion lapillum, Alpheus richardsoni and Ovalipes catharus

Wilson¹,

Constantine

Pine

et al. 2023

Sci Rep

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“…In addition to the NMLS, the KZN Boat Launch Site Monitoring System (BLSMS) established in 2004 plays a role in monitoring recreational boat-based catches from popular boat launching sites (Mann et al 2015 , 2019 ). Locations such as Sodwana Bay, Cape Vidal, St Lucia, Richards Bay and Durban Harbour documented the highest number of billfish caught (Fig.…”

Section: Billfish Fisheries In the Wio Region Summarized By Countrymentioning

confidence: 99%

Status and challenges for sustainable billfish fisheries in the Western Indian Ocean

Kadagi

Wambiji

Mann

et al. 2022

Rev Fish Biol Fisheries

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Billfish species (families Istiophoridae and Xiphiidae) are caught in artisanal, recreational, and commercial fisheries throughout the Western Indian Ocean region. However, data and information on the interactions among these fisheries and the ecology of billfish in the WIO are not well understood. Using an in-depth analysis of peer-reviewed articles, grey literature, observation studies, and authors’ insider knowledge, we summarize the current state of knowledge on billfish fisheries in 10 countries. To describe historical and current trends, we examined fisheries statistics from governmental and non-governmental agencies, sportfishing clubs’ reports, diaries of sportfishing captains, and the catch and effort databases of the Indian Ocean Tuna Commission. We highlight two key points. First, billfish fisheries in the Western Indian Ocean are highly diverse, comprising two distinct segments—coastal and oceanic. However, data are poor for most countries with significant gaps in information especially for sport and artisanal fisheries. Second, the evidence assembled showed that billfish species have immense social, cultural, and economic value. Swordfish are targeted by both large-scale and semi-industrial fisheries, while other billfish species, particularly marlin, are highly sought after by sport fisheries in most countries. Our paper provides a comprehensive review of billfish fisheries and available information in the context of the WIO underscoring the need to strengthen data collection and reporting, citizen science, and collaborative sustainable development and management of billfish. Supplementary Information The online version contains supplementary material available at 10.1007/s11160-022-09725-8.

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“…The launching process is a complex event, especially when uncommon ship structures are of particular concern in the launching process [10]. However, launching using air bags still has risks [11], one of the risks that can occur is launch failure caused by air bags not being able to withstand the launch load [9]. The launch load or weight consists of the weight of the launched vessel and the weight of the launch equipment [6].…”

Section: Introductionmentioning

confidence: 99%

Design of a Passenger Ship Launch Using an Air Bag System

Abdullah,

Sarena

2024

JurTek: Jurnal Teknologi FT UMJ

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Ship launching is one of the stages of ship production before the ship is handed over to the owner, which marks the beginning of the ship's life. With the development of technology at this time, various launching methods have been developed, one of which is the launching method using an air bag system. Launching using air bags has many advantages compared to conventional launching methods that have been used so far. Pre-launch calculations are performed to avoid risks during the launch. Launching using air bags begins with calculating the weight plan of the ship launch and the preparation of the air bag layout. Using CB/T 3837:1998 Technological Requirements for Ship Upgrading or Launching Relying on Air Bags, Shipbuilding Industry Standard, and ISO 14409:2011 ships and marine technology-ship launching air bags, the number of air bag requirements and layout can be determined to support the ship launching process. The passenger ship, with an length overall of 62.80 metres, is planned to have a launch weight of 1058.881 tons. By using the QG6 high-bearing capacity air bag model with 6 layers of cord fabric with a diametre of one metre and a contact length between the air bag and the ship's body of ten metres, a total of 11 air bags are required in a linear arrangement to support the launch of a passenger ship. The distance between air bags is 2.07 metres to 5.736 metres, the longer the distance between air bags, the greater the load supported by each air bag.

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The KwaZulu-Natal Boat Launch Site Monitoring System: A novel approach for improved management of small vessels in the coastal zone

Cited by 5 publications

References 6 publications

Impact of small boat sound on the listening space of Pempheris adspersa, Forsterygion lapillum, Alpheus richardsoni and Ovalipes catharus

Impact of small boat sound on the listening space of Pempheris adspersa, Forsterygion lapillum, Alpheus richardsoni and Ovalipes catharus

Status and challenges for sustainable billfish fisheries in the Western Indian Ocean

Design of a Passenger Ship Launch Using an Air Bag System

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