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  • Seaweeds are produced for food and as industrial products throughout the Pacific and many communities rely on this production for significant portions of their income. This industry is diverse in the types of seaweeds produced, whether they are cultured or harvested from the coastline , the way that they are processed and in the final use of the seaweeds. However, the production of seaweed is fragmented across th e Pacific region, and the range of opportunities is not well understood and has rarely been evaluated. The overarching aim of this project was to diversify the activities and, correspondingly, the opportunities available to the seaweed industry in the Pacific Islands. The project conducted a diverse range of research for development activities relating to seaweed production and bioproduct evaluation in three partner countries (Fiji, Samoa and Kiribati) working with government fisheries departments, university researchers, community groups and the private sector. The first research objective of the project was t o improve production levels and post - harvest quality of carrageenan gel - producing red seaweed Kappaphycus in Fiji and Kiribati . During t he project , p artners identif ied bottlenecks in the production of this commodity seaweed , evaluated technical barriers for expansion of seaweed production into new communities and how to sustain these efforts, and conduct ed scientific analyses of the quality of the seaweed biomass produced with a view to understanding how the value of the seaweed can be maximised . This work include d activities such as environmental monitoring of the key production sites in each country, reporting on the volumes and value of seaweed in th e domestic supply chains, empirical investigations of growth of different seaweed strains and insights from the communities regarding the socio - economic importance of seaweed farming . In Fiji, 15 Kappaphycus production sites were studied across the Central, Western and Northern divisions, working with the Ministry of Fisheries and Forests and the University of the South Pacific . Through a concurrent effort by government, a number of farm clusters were established and communities were producing seaweed in 2014 ( 35 tonnes) and 2015 (3 9 tonnes), with the majority of production in the Yasawa Islands (70% of national volume). Environmental monitoring of key sites was not able to differentiate any effects of the main physical variables ( temperature, current speed, light levels, nutrients - nitrogen and phosphorus), nor any distinction in terms of the culture methods and drying techniques on production volume and quality . Our insights suggest that it is likely a combination of singular environmental events and human factors that contributed to variation in output, i ncluding that many sites were pre - selected that had previously been farming sites. This was confirmed by social studies that highlighted most of the current crop of farmers had farmed seaweed before, as well as other insights including that 2/3 of farmers were male, many were over 50 years old (30%), most conducted seaweed farming as a family activity (95%), and identified weather and transportation as the main barriers for production. National production i n Fiji was halted by Cyclone Winston in 2016 (one of the strongest cyclones to hit Fiji), and recovery has been slow (2016 - 4 tonnes; 2017 ~9 tonnes) . Data and analysis from project activities were submitted and presented to the Fijian government and shared through the National Seaweed Taskforce which included members of the project team . Efforts in Fiji continue for the export production of Kappaphycus , but farming remain s heavily dependent on government support and initiatives. In Kiribati, 4 Kappaphycus production sites were studied on 3 islands in the Gilbert Group (Tarawa, Aranuka and Abaiang) with project scientists from the Ministry of Fisheries & Marine Resources Development . Production of seaweed from Kiribati is primarily from Fanning Island, in the Line Islands, however dried seaweed is typically stockpiled by the Central Pacific Producers Ltd (CPPL) on Tarawa as the supply chain is broken and sales to Asian processors are sporadic. O n the capital Tarawa, seaweed farming had not occurred for many years and seaweed strains had to be sourced from other locations for project trials . These trials were run with two strains – one of the original Kappaphycus strains (collected from Fanning Island) and one of the new temperature - tolerant strain s (“ maumere ” ) imported by MFMRD from Indonesia . Cyclone Winston in 2016 led to significant wave damage to the coastline, including the study sites. Small seaweed farms have continued after the project with farmers affiliated with Fisheries continuing to produce, dry and sell to the CPPL company. The key findings for this objective mirrored in many ways those of Fijian efforts, which are a narrative of environmental challenges (storms, sedimentation of the seaweed, and high temperatures), supply chain challenges (intermittent buyers that question product quality) and issues around the value of seaweed farming for farmers, especially those on the outer islands with the competition from copra with its regulated prices. Kiribati Fisheries and the CPPL have developed a taskforce to address these concerns, focussing on the potential of short supply chains and local use of the seaweed product to diversify the end use away from export in the near term.

    Author(s): Aisake Batibasag, Joji Vuakaca, Neomai Ravitu, Magele Ropeti, Justin Aiafi, Esmay Tanielu, Ulusapeti Tiitii, Shirleen Bala, Cherie Morris, Tooreka Temari, Tereere Tioti, Tentaku Teata, Karibanang Tamuera, Libby Swanepoel, Ana Wegner, Ian Tuart, Nicholas Paul
  • In order to sample, identify and determine Seaweed biomass in the Oman Sea coast (Sistan & Baluchestan Province) with 300 Km length from Gwatr area (with 25 10 N & 61 30 E) to Mydani (25 24 N & 59 5 E) during two years (from Octobr 2001 to September 2003), eleven regions of Gwatr, Passabandar, Beris, kachoo, Ramin, Chabahar, Pozm, Gurdim, Tang, Jood and Mydani were selected as sampeling stations from east to west. Seaweed growth area in intertidial zones determind by measuring and recording of geographic positions by metertape and GPS, then with the help GIS system and satellite maps, area, situation and maps of survey areas, were obtained 15 transects were determind with equal distance in coast area and monthly sampling were done randomly by quadrate 50*50 Cm the samples were transfered to the lab and the weight of each species was obtained after being cleaned, and separating. The biomass of each species per area unit and in the total area was obtained after determing the average weight of species. 

    Also the prefered zones of each species were determined through the maximum number of presence in the transects. 

    Along with this research, the Seaweed species were reconized according to the present references. The photographs were taken and the herbarium sheet was obtained. The samples were sent to experts for final approval. To compare the biomass changes during two years (2002 & 2003), this research was with the same methods of first year from October 2002 to September 2003 in Gwatr, Beris, Ramin, Tang and Jood. 

    During this research 180 species were collected. Among these seaweeds, 160 species (composed of 39 species green algea, 39 species brown algae and 82 species red algae) were identified. There were some important families including green algae (Ulvaceae & Caulerpaceae), brown algae (Sargassaceae & Dictyotaceae) and red algae (Gracilariaceae, Gelidiaceae and Hypneaceae ). 

    Wet biomass of Seaweeds in the total area of Sistan & Baluchestan coasts were 10269399 kg in 2002.
    Among this biomas, 2645223 kg (%25.7) green algae, 2953279 kg (%28.8) brown algae and 4670897 kg (%45.5) red algae were estimated and the monthly average for then were obtained 264522.3 kg, 295327.9 kg and 467089.7 Kg respectively. The maximum biomass was obtained 922246 kg in Chabahar and minimum biomass was obtained 1418 kg in pozm.
    The amount of alginophyte (Sargassum Spp.), agarophyte (Gracilaria, Gelidium & Gelidiella) and karaginophyte (Hypnea musciformis) were 159777 kg, 806915 kg and 188783 kg respectively. In second year (2003), the biomass of wet weight was 4114655 kg in 5 zones. Among this biomass, 849227.5 kg (%20.6) green algae, 1669792 kg (%40.6) brown algae and 1595636 kg (%38/8) red algae were obtained. The monthly average were 70769 kg, 139149.3 kg and 132969.7 kg respectively. The biomass of alginophyte, agarophyte and karaginophyte were 163776.4 kg, 481642.6 kg and 64310.1 kg respectively this year. 

    Author(s): Byram Mohammad Gharanjik , Sh. Ghasemi, A.B. Delokiyan, N. Khodaparast, Gh. Rahimi, M. DJahanbakhsh, N.M. Tatari
  • Here we report the occurrence of the two non-native brown macroalgal species Sargassum horneri (Turner) C. Agardh and Undaria pinnatifida (Harvey) Suringar in San Diego County and describe expansions in their ranges and new invasions on the California and Baja California coasts. Both species have exhibited characteristics of successful invaders: establishing in new areas, spreading locally, and persisting through multiple generations in areas that have been invaded. These species now occur primarily in harbors, but have also invaded open coast sites, suggesting that they can invade areas with relatively high wave action and with well-established native benthic communities. The rapid and uncontrolled spread of these species to date has serious implications for their expansion along the west coast of North America. The ecological and economic consequences of these invasions require further research. 

    Author(s): Nikolas John Kaplanis, Jill L. Harris, Jennifer E. Smith
  • The deep water areas at Alantalai--Manapad (Southern Zone) and Vembar-Nallatanni Tivu (Northern Zone) region in Tamilnadu were surveyed during 1988 for seaweed resources employing 'SCUBA' diving technique. A total of 28 species of algae in the Southern Zone and 27 in the, Northern Zone were encountered. Majority of the seaweeds belonged to Rhodophycaae.

    Author(s): Rao, K Rama, Rao, P V Subba, Mal, T K, Subbaramaiah, K, Kaliaperumal, N, Kalimuthu, S, Muniyandi, K, Ramalingam, J R, Pillai, S Krishna, Chennubhotla, V S Krishnamurthy
  • The present paper deals with the distribution of seaweeds and seagrasses during the deep sea survey conducted in the first sector from Kattapadu to Tiruchendur in Tamil Nadu coast between December 1986 and March 1987 covering an area of 650 sq.km. In this survey 58 species of marine algae were recorded of which 7 belong to Chlorophyta 12 to Phaeophyta and 39 to Rhodophyta. Three species of seagrasses viz. Cymodocea serrulata. Halophila ovails and H. ovala were also recorded at the depths ranging from 5.5 to 21.5 III Halim eda macroloba, Dictyota barlayresiana, D. Maxima, Gracliaria corticata var. corticala, G. edulis, Sarcodia indica, Sarconema filiform e, Soliena robusta, flypnea esperi and H. Valentiae were found to be dominant and widely distributed.

    Author(s): Kaliaperumal, N, Chennubhotla, V S Krishnamurthy, Kalimuthu, S, Ramalingam, J R, Pillai, S Krishna, Subbaramaiah, K, Rao, K Rama, Rao, P V Subba
  • The deep water area between Valinokkam and Kilakkarai in Tamil Nady coast covering an area of 200 sq.km. was surveyed for the distribution of marine algae and seagrasses during January 1989. Totally 33 species of marine algae were recorded of which 8 species belonged to Chlorophyta, 8 to Phaeophyta and 17 to Rhodophyta. Only one species of seagrass Halophila ovalis occurred in the whole area surveyed. The vertical distribution of seaweeds and their abundance were investigated. Hydrological data collected from the area surveyed are presented.

    Author(s): Kaliaperumal, N, Kalimuthu, S, Muniyandi, K, Ramalingam, J R, Pillai, S Krishna, Chennubhotla, V S Krishnamurthy , Rajagopalan, M S, Rao, P V Subba, Rao, K Rama, Thomas, P C, Zaidi, S H, Subbaramaiah, K
  • Resources survey of algae and seagrasses in 63 estuaries and backwaters existing from Madras to Athankarai in Tamil Nadu and Pondichery was made during 1988-89. Among these water bodies, only 44 supported vegetation. Totally 36 species of algae belonging to 23 genera under the groups Chlorophyta, Phaeoph~ta,R. hodophyta and Cyanophyta, and 5 species of seagrasses belonging to 3genera were recorded from these estuaries. The agar yielding seaweeds Gracilaria arcuata and G. verrucosa and carrageenan yielding seaweed Hypnea valentiae occurred in harvestable quantities in some estuaries.

    Author(s): Kalimuthu, S, Kaliaperumal, N, Ramalingam, J R
  • Macroalgal distribution and abundance in different regions of a coral reef was studied for a period of one year in 1998 at Minicoy Island, Lakshadweep. The biomass distribution of algac on the seaward side of the reef varied from 620.2 g wet wt/m2 in September to a maximum of 2800.6 g wet wt/m2 in August. Reef flat had a minimum in July (251 g wet wt/m2) and a maximum in December (2074.9 g wet wt/m2). Significant seasonal differences were noticed in the three regions with maximum biomass during monsoon on the seaward side and in the postmonsoon at reef flat and lagoon side of the reef. Laurencia ceylanica ornate (32.0%) were major algae of he reef flat and lagoon side of the reef. Minor algae observed on the reef were Gelidiella acerasa. Bocrgesenia forbesil, Sargassum duplicatum and Cladophoropsis zollingeri. Hydrographical parameters such as water temperature, salinity, nutrients, rainfall and hours of exposure of algac were monitored.

    Author(s): Mohamed, Gulshad, Nasser, A K V, Koya, C N Haneefa
  • A three-dimensional coupled hydrodynamic-sediment transport model for the Texas–Louisiana continental shelf was developed using the Regional Ocean Modeling System (ROMS) and used to represent fluvial sediment transport and deposition for the year 1993. The model included water and sediment discharge from the Mississippi River and Atchafalaya Bay, seabed resuspension, and suspended transport by currents. Input wave properties were provided by the Simulating WAves Nearshore (SWAN) model so that ROMS could estimate wave-driven bed stresses, critical to shallow-water sediment suspension. The model used temporally variable but spatially uniform winds, spatially variable seabed grain size distributions, and six sediment tracers from rivers and seabed.

    At the end of the year 1993, much of the modeled fluvial sediment accumulation was localized with deposition focused near sediment sources. Mississippi sediment remained within 20–40 km of the Mississippi Delta. Most Atchafalaya sediment remained landward of the 10-m isobath in the inner-most shelf south of Atchafalaya Bay. Atchafalaya sediment displayed an elongated westward dispersal pattern toward the Chenier Plain, reflecting the importance of wave resuspension and perennially westward depth-averaged currents in the shallow waters (o10 m). Due to relatively high settling velocities assumed for sediment from the Mississippi River as well as the shallowness of the shelf south of Atchafalaya Bay, most sediment traveled only a short distance before initial deposition. Little fluvial sediment could be transported into the vicinity of the ‘‘Dead Zone’’ (low-oxygen area) within a seasonal–annual timeframe. Near the Mississippi Delta and Atchafalaya Bay, alongshore sediment-transport fluxes always exceeded cross-shore fluxes. Estimated cumulative sediment fluxes next to Atchafalaya Bay were episodic and ‘‘stepwise-like’’ compared to the relatively gradual transport around the Mississippi Delta. During a large storm in March 1993, strong winds helped vertically mix the water column over the entire shelf (up to 100-m isobath), and wave shear stress dominated total bed stress. During fair-weather conditions in May 1993, however, the freshwater plumes spread onto a stratified water column, and combined wave–current shear stress only exceeded the threshold for suspending sediment in the inner-most part of the shelf.

    Author(s): Kehui Xu, Courtney K. Harris, Robert D. Hetland, James M. Kaihatu
  • In addition to the presentations given by the invited experts at the “Open Ocean Aquaculture— Moving Forward” workshop, valuable information was exchanged during the four discussion sessions held during the workshop. Discussion topics included current definitions of open ocean aquaculture, the non-environmental challenges to its further development, the business aspects, environmental monitoring, and the potential further expansion of open ocean aquaculture. At the end of the workshop, participants listed the main research gaps and strategies for moving open ocean aquaculture forward. We would like to express our thanks to John Corbin, John Forster, John Volkman, and Richard Langan for serving as recorders during the discussions and for their contribution to the content of this summary, which represents a compilation of their notes, a summary of the discussion transcripts, and written comments of the participants. We would also like to extend our appreciation for funding support from the Office of Oceanic and Atmospheric Research of the National Oceanic and Atmospheric Administration (NOAA, Grant #NA05OAR4171169) to Oceanic Institute. The views and opinions expressed in this article do not necessarily reflect those of the National Oceanic and Atmospheric Administration, Oceanic Institute, or of all of the participants at the workshop.

    Author(s): Cheng-Sheng Lee, Patricia J. O’Bryen

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