scholarly journals Soft bodies make estimation hard: correlations among body dimensions and weights of multiple species of sea cucumbers

2015 ◽  
Vol 66 (10) ◽  
pp. 857 ◽  
Author(s):  
James Prescott ◽  
Shijie Zhou ◽  
Andhika P. Prasetyo
Keyword(s):  
Power Function ◽  
Body Length ◽  
Sea Cucumber ◽  
Dry Weight ◽  
Basic Knowledge ◽  
Small Scale ◽  
Body Width ◽  
Sea Cucumbers ◽  
Body Dimensions ◽  
Wet Weight

Tropical sea cucumbers are commonly exploited by small-scale, poorly managed fisheries. A fundamental problem in managing sea cucumber fisheries is the lack of basic knowledge of important life history characteristics for most species. As a result of plastic body dimensions, biological research on this group of animals becomes exceptionally challenging. To improve our understanding of essential biological parameters, we conducted a study to investigate correlations among various body measurements. We analysed a total of 18 sea cucumber species and more than 6600 individuals collected at Scott Reef in the Timor Sea, north-west Australia. We used hierarchical Bayesian errors-in-variables models to specifically take into account measurement errors that are obviously unavoidable. The measures included three types of weights (wet weight, gutted weight and dry weight) and two body dimensions (length and width). The modelling reveals that using both body length and width as independent variables, wet weight increases approximately linearly with body length, but is a power function (~1.6) of body width, although variability exists among species. Dry weight tends to increase more slowly with body length, but has a similar power function of body width. Linear relationships are established between the three types of weights. On average, ~11% of a live specimen and ~16% of a gutted specimen is processed to the commercially traded dry body wall. Our results can be applied to sea cucumbers in other areas and can be useful for data standardisation and size-based fisheries management.

scholarly journals Effects of chronic dietary hexavalent chromium on bioaccumulation and immune responses in the sea cucumber Apostichopus japonicus

2021 ◽  
Author(s):  
Qixia Chan ◽  
Fuqiang Wang ◽  
Lidong Shi ◽  
Xue Ren ◽  
Tongjun Ren ◽  
...  
Keyword(s):  
Immune Responses ◽  
Hexavalent Chromium ◽  
Sea Cucumber ◽  
Body Wall ◽  
Apostichopus Japonicus ◽  
Hydrolytic Enzymes ◽  
Dry Weight ◽  
Control Group ◽  
Sea Cucumbers ◽  
Wet Weight

ABSTRACTSea cucumbers Apostichopus japonicus (3.54 ± 0.01 g of wet weight) were exposed to five concentrations of dietary hexavalent chromium [0 (control), 100, 200, 400, and 800 mg Cr6+/kg dry weight] amended with K2Cr2O7 for 30 days. The bioaccumulation and immune responses [antioxidant enzymes: superoxide dismutase (SOD) and catalase (CAT); hydrolytic enzymes: acid phosphatase (ACP) and alkaline phosphatase (AKP)] of sea cucumbers were subsequently evaluated. This study found that the order of Cr accumulation in the experimental tissues was respiratory tree > intestine > body wall. Significantly lower SOD activities occurred in the 400 mg/kg group compared to that in the control group. Higher dietary Cr6+ exposure (400 and 800 mg Cr6+ /kg dry weight) did not negatively alter the CAT activities, but significantly inhibited CAT activities in 100 mg/kg group, compared to control group. ACP activities in groups 200, 400 and 800 mg/kg were significantly lower than those in control group, while no significant differences occurred in AKP activities among groups. The present study provides important information into the bioaccumulation and immune responses of the sea cucumber A. japonicus in response to chronic dietary Cr6+ exposure.

scholarly journals Small-scale fishing income and fuel consumption: Fiji’s artisanal sea cucumber fishery

2018 ◽  
Vol 75 (5) ◽  
pp. 1758-1767 ◽  
Author(s):  
Steven W Purcell ◽  
Watisoni Lalavanua ◽  
Brian R Cullis ◽  
Nicole Cocks
Keyword(s):  
Gender Equity ◽  
Sea Cucumber ◽  
Large Scale ◽  
Small Scale ◽  
Breath Hold ◽  
Net Income ◽  
Fuel Use ◽  
Sea Cucumbers ◽  
Deep Water Species ◽  
And Gender

Abstract Understanding the income and costs of fishing is fundamental to managing fisheries and planning interventions to improve efficiency and gender equity. Few studies offer data on fisher incomes and fuel use in small-scale fisheries (SSFs), and fewer have assessed factors influencing variation among fishers and between genders. We interviewed 235 artisanal fishers among 34 island villages in an artisanal sea cucumber fishery in Fiji. Linear mixed models were used to determine the effect of geographic and socioeconomic variables on incomes and fuel use from fishing sea cucumbers. Net income of sea cucumbers to fishers, averaging FJ$8, 171 year−1 (US$4, 494 year−1) (range: FJ$0–52,008 year−1), varied among villages and was 47% lower for women than men. On an average, 60% of fishers’ gross annual income came from fishing and selling sea cucumbers, although this proportion varied greatly even within villages. Fishers who practised gleaning, fished less often, or possessing numerous livelihood income streams, were less economically dependent on sea cucumbers. Men tended to estimate higher incomes for an average day of fishing than women when compared with their recall of last sale. Fuel use varied greatly among regions in Fiji but, overall, averaged 428 L fisher−1 year−1, and represented 28% of gross income. More economical fishing strategies by women resulted in lower fuel use than men per fishing day. Breath-hold divers used less fuel (compared to fishers using scuba) and fishers targeting deep-water species used more fuel than other fishers. A best approximation of 8000 t CO2 year−1 for the carbon footprint of the whole fishery suggests that some SSFs, such as the one studied here, can be significant contributors to greenhouse gas emissions, even compared to many large-scale fisheries globally. Reforms to the management of SSFs should consider regulations that minimize carbon emissions and reduce economic dependency on vulnerable marine resources.

Surface Area of the Euphausiid Thysanöessa raschii and Its Relation to Body Length, Weight, and Respiration

1977 ◽  
Vol 34 (2) ◽  
pp. 225-231 ◽  
Author(s):  
Gareth C. H. Harding
Keyword(s):  
Oxygen Consumption ◽  
Metabolic Rate ◽  
Surface Area ◽  
Body Length ◽  
External Surface ◽  
Dry Weight ◽  
External Surface Area ◽  
Marine Crustaceans ◽  
Respiratory Surface ◽  
Wet Weight

A method is described for estimating the surface area of marine crustaceans. The external surface area of the euphausiid Thysanöessa raschii (M. Sars) is proportional to length2.4, dry weight0.95, and wet weight0.84. Oxygen consumption is proportional to wet weight0.82, which indicates that respiration should be proportional to respiratory surface area. The implications of this finding regarding the relations of metabolic rate, size, and surface area are discussed in a broader framework by comparing them with similar studies on vertebrates and other invertebrates.

Variations in microfilariae and infective stages of two types of Wuchereria bancrofti from the Thai-Myanmar border

1999 ◽  
Vol 73 (4) ◽  
pp. 317-321 ◽  
Author(s):  
A. Jitpakdi ◽  
W. Choochote ◽  
P. Panart ◽  
D. Insun ◽  
K. Panart ◽  
...  
Keyword(s):  
Body Length ◽  
Wuchereria Bancrofti ◽  
Nerve Ring ◽  
The Body ◽  
Body Width ◽  
Space Length ◽  
New Variety ◽  
Body Dimensions ◽  
Morphological Studies ◽  
Space Width

Comparative morphometric and morphological studies of microfilariae and infective stages were undertaken in nocturnally periodic and subperiodic Wuchereria bancrofti. For microfilariae, the body dimensions of nocturnally periodic (NP) were significantly smaller than nocturnally subperiodic (NSP), i.e. body length 268.03 ± 14.75 μm (NP), 307.61 ± 11.52 μm (NSP); cephalic space length 4.21 ± 0.62 μm (NP), 5.32 ± 0.79 μm (NSP); head to nerve ring 49.39 ± 5.43 μm (NP), 57.40 ± 4.46 μm (NSP); innenkörper length 33.05 ± 5.89 μm (NP), 44.02 ± 8.71 μm (NSP); cephalic space width 4.28 ± 0.59 μm (NP), 6.04 ± 0.68 μm (NSP); body width at nerve ring 5.01 ± 0.57 μm (NP), 7.45 ± 0.75 μm (NSP). The number of nuclei between the cephalic space and nerve ring of NP (66.67 ± 5.19) was also significantly less than in NSP (94.74 ± 6.95). For infective stages, the body dimensions of NP were significantly smaller than NSP, i.e. body length 1632.50 ± 131.48 μm (NP), 2002.63 ± 222.60 μm (NSP); head to nerve ring 103.09 ± 7.47 μm (NP), 122.44 ± 9.62 μm (NSP); head to oesophago-intestinal junction 567.69 ± 94.84 μm (NP), 666.75 ± 110.08 μm (NSP); body width at oesophago-intestinal junction 23.15 ± 1.55 μm (NP), 26.78 ± 1.62 μm (NSP). It is too early to infer the NP type as an additional sibling species of W. bancrofti but it is reasonable to treat it as a new variety and additional work is needed to clarify its status.

scholarly journals Effects of sandfish (Holothuria scabra) removal on shallow-water sediments in Fiji

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4773 ◽  
Author(s):  
Steven Lee ◽  
Amanda K. Ford ◽  
Sangeeta Mangubhai ◽  
Christian Wild ◽  
Sebastian C.A. Ferse
Keyword(s):  
Penetration Depth ◽  
Sea Cucumber ◽  
Reef Flat ◽  
Turnover Rate ◽  
Coastal Ecosystems ◽  
Sea Cucumbers ◽  
Holothuria Scabra ◽  
Wet Weight ◽  
Stichopus Chloronotus ◽  
Shallow Water Sediments

Sea cucumbers play an important role in the recycling and remineralization of organic matter (OM) in reef sands through feeding, excretion, and bioturbation processes. Growing demand from Asian markets has driven the overexploitation of these animals globally. The implications of sea cucumber fisheries for shallow coastal ecosystems and their management remain poorly understood. To address this knowledge gap, the current study manipulated densities of Holothuria scabra within enclosures on a reef flat in Fiji, between August 2015 and February 2016, to study the effects of sea cucumber removal on sedimentary function as a biocatalytic filter system. Three treatments were investigated: (i) high density (350 g m−2 wet weight; ca. 15 individuals); (ii) natural density (60 g m−2; ca. 3 individuals); and (iii) exclusion (0 g m−2). Quantity of sediment reworked through ingestion by H. scabra, grain size distribution, O2 penetration depth, and sedimentary oxygen consumption (SOC) were quantified within each treatment. Findings revealed that the natural population of H. scabra at the study site can rework ca. 10,590 kg dry sediment 1,000 m−2 year−1; more than twice the turnover rate recorded for H. atra and Stichopus chloronotus. There was a shift towards finer fraction grains in the high treatment. In the exclusion treatment, the O2 penetration depth decreased by 63% following a 6 °C increase in water temperature over the course of two months, while in the high treatment no such change was observed. SOC rates increased ca. two-fold in the exclusion treatment within the first month, and were consistently higher than in the high treatment. These results suggest that the removal of sea cucumbers can reduce the capacity of sediments to buffer OM pulses, impeding the function and productivity of shallow coastal ecosystems.

Sea cucumber management strategies: challenges and opportunities in a developing country context

2019 ◽  
Vol 46 (4) ◽  
pp. 267-277 ◽  
Author(s):  
Merrill Baker-Médard ◽  
Kristina Natalia Ohl
Keyword(s):  
Developing Countries ◽  
Value Chain ◽  
Sea Cucumber ◽  
Critical Role ◽  
Management Strategies ◽  
Primary Source ◽  
Small Scale ◽  
Sea Cucumbers ◽  
High Dependency ◽  
Challenges And Opportunities

SummarySea cucumbers play a critical role in maintaining healthy marine ecosystems. Sea cucumbers are also a key source of income for millions of small-scale fishers worldwide. The lucrative nature of this industry has led to severe reductions in sea cucumber populations in numerous regions globally. A large proportion of sea cucumber fisheries are located in developing countries, which present unique challenges to management, including addressing highly decentralized methods of extraction and processing, limited economic and technological resources for governance and, in many cases, a high dependency on sea cucumbers as a primary source of income for small-scale coastal fishers. In this review, we review the benefits and challenges of seven categories of sea cucumber management strategies used globally in developing countries, including gear restrictions, size and weight limits, effort and catch controls, temporal closures, area closures, value chain licensing and territorial use rights in fisheries. We conclude that sea cucumber management in developing countries could benefit from focusing regulatory solutions on narrowed parts of the value chain, coupling production-based management strategies with processing and export regulations and providing avenues for local fishers to inform policy at the local, regional and national levels.

scholarly journals Pemanfaatan Teripang di Kabupaten Kaimana Provinsi Papua Barat

2020 ◽  
Vol 5 (2) ◽  
pp. 121
Author(s):  
Nurul Dhewani Mirah Sjafrie ◽  
Ana Setyastuty
Keyword(s):  
Sea Cucumber ◽  
Group Discussion ◽  
Dry Weight ◽  
Sea Cucumbers ◽  
Study Results ◽  
West Papua ◽  
Commercial Species ◽  
System Data ◽  
Papua Barat ◽  
The City

<strong>The Utilization of Sea Cucumber in Kaimana Regency, West Papua Province.</strong>Sea cucumbers are one of marine commodities that are traded at local, national and international scale. Kaimana Regency, West Papua Province is one of the sea cucumber producers in Indonesia. The exploitation of sea cucumber in this regency has been carried out for long times, applying the<em>sasi</em>system. The purpose of this study is to determine the exploitation of sea cucumbers with the <em>sasi</em> system. Data were collected in April 2018 in two location, namely Kayumerah Island and Kambala Village. Focus Group Discussion (FGD) was perfomed out using structured questions to gather information of the sea cucumber exploitation. The snowball technique was used to locate the sea cucumber collectors. This study results showed 22 commercial species of sea cucumber were found in Kayumerah Island and 33 species in Kambala Village. Duration of open-closed sasi in Kayumerah Island was 2 to 3 years for 14 days, while in Kambala Village was 2 years for 6 months. The average catched of sea cucumbers was 3.57 kg dry weight/person/ day in Kayumerah Island and 0.09 kg dry weight/person/day in Kambala Village. These commodities were sold to the city nearby. Sasi system at the study site seems to have changed due to an auction system or fee for collecting of sea cucumbers and a changes in capture methods, through diving supported by compressor

scholarly journals THE CORRELATION BETWEEN WET AND DRY WEIGHT OF INTESTINE AND BODY WITHOUT INTESTINE OF SEA CUCUMBER (Holothuria scabra)

2014 ◽  
Vol 9 (1) ◽  
pp. 51
Author(s):  
Lisa Fajar Indriana ◽  
Andreas Kunzmann
Keyword(s):  
Regression Analysis ◽  
Sea Cucumber ◽  
Significant Positive Correlation ◽  
Dry Weight ◽  
Sea Cucumbers ◽  
Positive Correlation ◽  
Holothuria Scabra ◽  
Tropical Sea ◽  
The Relationship

Holothuria scabra is a commercial tropical sea cucumber species, which has been exploited severely in recent years. This study was conducted at the Mataram Marine Bio Industry Technical Implementation Unit for 20 days aiming to determine the relationship between wet and dry weight of sea cucumbers with and without colon. Results of regression analysis between wet and dry weight show a significant positive correlation. The relationship between wet and dry weight without the colon is y = 0.1685x – 0.2319 (R2 = 0.9236) whereas the wet and dry wet of the intestine is y = 0.075x + 0033 (R2 = 0.791).

scholarly journals Sandfish (Holuthuria scabra) Fisheries in Saleh Bay: Stock Status Based on Fishermen’s Perception and Catches [Perikanan Teripang Pesisir (Holuthuria scabra) Teluk Saleh: Status Stok berdasarkan Persepsi Nelayan dan Hasil Tangkapan]

2019 ◽  
Vol 11 (2) ◽  
pp. 59
Author(s):  
Neri Kautsari ◽  
Etty Riani ◽  
Djamar TF Lumbanbatu ◽  
Sigid Hariyadi
Keyword(s):  
High School ◽  
Sea Cucumber ◽  
Education Level ◽  
Senior High School ◽  
Species Extinction ◽  
Sea Cucumbers ◽  
Male And Female ◽  
Stock Status ◽  
Wet Weight

AbstractThe exploitation of sandfish (Holuthuria scabra) in Saleh Bay is so far not well managed. Consequently, over-fishing and species extinction of sea cucumbers emerge. Currently, information related to the supply of sandfish (H. scabra) is very limited. The purpose of this research was to investigate the stock status of sandfish (H. scabra) based on the fishermen’s perception and fish capture information. This research was carried out in the Saleh Bay coast, Sumbawa District, West Nusa Tenggara. The method used was a semi-closed interviews with the scope of fishermen’s demography, methods, efforts and catches, and fishermen’s perception of the stock condition, conducted by a total of 39 respondents. The result of this research showed that sea cucumber fishermen consisted of male and female with a ratio of 46 : 54, age ranged between 26-59 years old, all were married; education level between unschooled to senior high school; fishermen were from Bajo tribe (37%), Bugis (25%), Samawa (5%) and Mandar (33%). Sea cucumbers were caught by hands for 5-6 weeks (1-4 hours per day), CPUE ranges between 2 to 25 kg (wet weight). The main reason for capturing sea cucumber was because of the ease of method (97%). 84% of the fishermen stated that sea cucumber stock in Saleh Bay declined. The research cocluded the fishermen on Saleh Bay assumed that sandfish (H. scabra) had decreased in stock.AbstrakEksploitasi teripang pasir (Holuthuria scabra) di perairan Teluk Saleh terus dilakukan tanpa adanya pengelolaan sehingga memacu terjadinya kelebihan tangkap dan bahkan bisa menyebabkan kepunahan spesies teripang pasir. Kurangnya ketersediaan informasi dan data terkait stok menyebabkan sulitnya pengelolaan teripang pasir (H. scabra) di perairan Teluk Saleh ke depannya. Tujuan dari penelitian ini adalah untuk mengetahui staus stok teripang pasir (H. scabra) berdasarkan persepsi nelayan dan gambaran hasil tangkapan. Lokasi penelitian yaitu di pesisir wilayah perairan Teluk Saleh, Kabupaten Sumbawa, Nusa Tenggara Barat. Metode yang digunakan ialah wawancara semi tertutup dengan menggunakan kuesioner. Aspek yang dikaji dalam wawancara terdiri dari : 1) demografis nelayan; 2) metode, upaya dan hasil tangkap serta 3) persepsi nelayan terhadap kondisi stok. Responden dalam penelitian ini ialah nelayan penangkap teripang yang berada di pesisir Teluk Saleh. Jumlah responden adalah 39 orang. Hasil penelitian menunjukkan bahwa penangkap teripang pasir terdiri dari laki-laki dan perempuan dengan rasio 46 : 54%, usia berkisar antara 26-59 tahun, nelayan berstatus telah menikah, tingkat pendidikan nelayan mulai dari tidak bersekolah hingga SMU, nelayan berasal dari suku Bajo (37%), Bugis (25%), Samawa (5%) dan Mandar (33%). Penangkapan teripang dilakukan menggunakan tangan, penangkapan dilakukan 5-6 minggu-1 (1–4 jam hari-1), CPUE ialah 2 hingga 25 kg (berat basah), alasan utama nelayan (97%) menangkap teripang pasir adalah kemudahan metode penangkapan, 84% nelayan menyatakan bahwa stok teripang pasir di Teluk Saleh mengalami penurunan. Kesimpulan dari penelitian ialah sebagian besar nelayan Teluk Saleh menganggap bahwa teripang pasir (H. scabra) telah mengalami penurunan stok.

scholarly journals Morphometrics and processing yield of Cucumaria frondosa (Holothuroidea) from the St. Lawrence Estuary, Canada

PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0245238
Author(s):  
Catherine M. Couillard ◽  
Domynick Maltais ◽  
Rénald Belley
Keyword(s):  
Body Mass ◽  
Body Length ◽  
Sea Cucumber ◽  
Reproductive Status ◽  
Whole Body ◽  
Sea Cucumbers ◽  
Recovery Rates ◽  
Lawrence Estuary ◽  
St Lawrence Estuary ◽  
Cucumaria Frondosa

Sea cucumber Cucumaria frondosa have highly variable whole body mass and length, and are usually sold to Asian markets as dried gutted body wall. Understanding the relation between size and yield of dry product is essential for resource conservation and for economic purposes. In this study, stock-specific mass and length recovery rates were estimated for C. frondosa captured by dredging or diving at various depths and seasons on the South shore of the St. Lawrence Estuary, along Gaspé Peninsula, and processed in a commercial plant. The processing yield in dry product mass per sea cucumber was more than 1.5 times larger for sea cucumbers collected at 26–47 m depth compared to those collected at 9–16 m depth. Within each strata, there was little variation in the processed body mass, seasonally or spatially. Recovery rates based on gutted mass for this stock (13.4─14.5%) varied little among depths and seasons, despite observed seasonal and bathymetric variation in reproductive status. In contrast, recovery rates based on whole body mass and length were highly variable both seasonally and spatially. Stress related to dredging or post-capture handling induced important variable body contraction and water content, leading to variation in body length, mass and shape of sea cucumbers having the same processed body mass. Gutted mass was the best metric to predict processed body mass and to estimate size whereas whole body length was the least reliable. New stock-specific information on variability of body mass, length, and recovery rates induced by capture, and on seasonal and bathymetric variation in reproductive status and processing yields will be used for the design of future stock assessment surveys, and for stock conservation.

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