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Crustaceans are of great importance to humans as they are source of almost all economically important and high-priced commodities. Tinusa Island in Basilan Province is rich in crustacean resources that are utilized as the main food source and livelihood of the local residents. Herein, the abundance, supply chain analysis and marketing of crustacean...
Citations
... Fish may be consumed as fresh, fermented, dried, smoked, or canned products (Alcala & Russ 2002). In areas where there is a high demand for good quality and fresh fishery products, improved handling methods are commonly used (Abduho & Madjos 2018;Suh & Pomeroy 2020). Otherwise, by-products are frozen, canned, and converted to valueadded products to minimize fish waste. ...
Improper management of fish waste is one of the factors that makes Philippine fisheries unsustainable. A considerable portion of fish waste is produced in wet markets where bulk of fish products are sold. A comparison of existing practices in different municipalities can indicate the best points of intervention and identify existing traditional practices that can be promoted. This study interviewed stakeholders of the fisheries industry and collected information at the market level to determine existing fish waste management systems. From the responses gathered, the average daily production of fish waste in Philippine wet markets was 70.3 + 0.93 kg, with no significant differences across locations (p = 0.2501). Of the fish waste produced, 32.3 + 1.33 kg per wet market were disposed of, 18.9 + 0.81 kg were sold, and 19.1 + 1.15 kg were given away to stakeholders who re-use the fish waste. A significantly greater proportion of fish waste in rural areas were re-used compared to Metro Manila (p = 0.0311). Incentivizing innovations that maximize the use of derived fish waste at the municipal level, and promoting existing traditional practices, can prove effective in contributing to the Philippine circular economy while providing alternative sources of income for the stakeholders of the fisheries industry.
... Ravago and Juinio-Meñez (2003) clarified the phylogenetic position and described some physical distinctions of various spiny lobster species particularly that of the sub-species P. l. longipes and P. l. bispinosus, and P. femoristriga as separate species. The most recent published study on spiny lobster assessment was undertaken by Abduho and Madjos (2018), who documented the crustacean fishery, including lobsters and crabs in Basilan Province. However, valuable biological and economic reference points have not been established since Arellano's (1988) examination of specific demographic metrics in the 1980s. ...
Spiny lobsters are an important resource of the artisanal fishery in Eastern Visayas, Philippines. It has long been harvested and contributes to the region's local economy. Despite being a high-value species, the spiny lobster resource has not been monitored and regulated for decades. This study aimed to assess the spiny lobsters in Eastern Visayas and provide recent information to support local resource management. Spiny lobsters were assessed from 2018 to 2019 in four major sampling areas in Eastern Visayas: (1) Guiuan and (2) San Policarpo in Eastern Samar province, (3) San Jose in Northern Samar, and (4) Silago-Hinunangan in Southern Leyte. Species composition, relative abundance, geographical and seasonality distribution, and size structure of spiny lobster resource in the region were described. Six species and subspecies of the genus Panulirus were observed in the catch landings: P. penicillatus (65%), P. ornatus (18%), P. versicolor (2.8%), P. femoristriga (5.3%), P. longipes longipes (6.1%), and P. longipes bispinosus (1.7%). Incidental catches (1.3%) of the ambiguous forms of P. longipes were also observed. P. penicillatus were more prevalent in areas exposed to the Pacific, such as Guiuan and San Policarpo, while adult P. ornatus were chiefly harvested in Northern Samar and Southern Leyte. The other lobster species were either occasional or rare in some areas. Calmer waters and good weather during dry months in Eastern Visayas allow fishers to sail and gather lobsters. The surge in the abundance of P. ornatus and P. penicillatus from July to December was also affected by market demand. Panulirus femoristriga, P. versicolor, and P. longipes subspecies generally peaked from April to June in Eastern Samar and July to September in Northern Samar and Southern Leyte areas. These species would decline in abundance towards the end of the year. The general size structure of spiny lobster catches in Eastern Visayas revealed extreme harvesting of juveniles and sub-adults (< 77.5 mm CL), except for P. ornatus. The fishery could be on the verge of growth overfishing since 50-90% of the catch have CL below their size at first maturity. Panulirus ornatus is targeted at larger sizes (96-107 mm CL) and as a live catch due to its high value and marketability. Raising awareness of the species, reinforcing existing regulations on minimum size limits, and prohibiting the use of compressor diving as a hazardous collection method should be prioritized by fishery managers to protect both the spiny lobster resource and the gatherers in Eastern Visayas.
... While the literature on L. sulcata is extremely limited, it has been reported as sympatric with L. maculata (Manning, 1978;Lecchini et al., 2010). Like other spearer mantis shrimps, the species L. maculata is the object of targeted fisheries (Ahyong et al., 2017;Abduho & Madjos, 2018;Baigtu & Echem, 2018) and caught as by-catch in other fisheries (Babu et al., 2022;Courtney et al., 1999; al., 2007). The zebra mantis shrimps including L. maculata (and perhaps L. sulcata as they are very similar) are commonly found in big seafood restaurants in Bali and Batam, Indonesia (Pers. ...
Introduction:
Mantis shrimps are ecologically and economically important organisms in marine ecosystems. However, there is still a lack of information about their habitat, in particular, their burrows.
Objective:
To analyze how dense and sparse mantis shrimp burrows differ in abundance, size, sediment grain size, and water quality.
Methods:
We counted burrows in 10 x 10 m² random plots in sparse and dense seagrass (ten plots per density), around Barrang Lompo Island, South Sulawesi, Indonesia. Sampling took place at spring low tide from August to September 2017.
Results:
Two mantis shrimp species were observed: Lysiosquillina maculate and L. sulcata. Dense and sparse seagrass burrows did not differ in wall grain size or water parameters, both inside and outside of the burrows (P > 0.05). Similarly, there was no correlation between burrow depth and diameter in either dense (P > 0.05; r= 0.27) or sparse (P > 0.05; r= 0.33) seagrass. However, larger burrows tend to occur in denser beds, but there were more burrows in denser seagrass (t-test, P < 0.05).
Conclusions:
There seems to be a preference for dense seagrass beds, especially by larger mantis shrimps. The correlation between shrimp burrow abundance and seagrass density highlights the importance of conserving the quality as well as the extent of seagrass habitat.
... Different letters above error bars indicate significant differences. (Ahyong et al., 2017;Abduho & Madjos, 2018;Baigtu & Echem, 2018) and caught as by-catch in other fisheries (Babu et al., 2022;Courtney et al., 1999;Courtney et al., 2007). The zebra mantis shrimps including L. maculata (and perhaps L. sulcata as they are very similar) are commonly found in big seafood restaurants in Bali and Batam, Indonesia (Pers. ...
Introduction: Mantis shrimps are ecologically and economically important organisms in marine ecosystems. However, there is still a lack of information about their habitat, in particular, their burrows. Objective: To analyze how dense and sparse mantis shrimp burrows differ in abundance, size, sediment grain size, and water quality. Methods: We counted burrows in 10 x 10 m2 random plots in sparse and dense seagrass (ten plots per density), around Barrang Lompo Island, South Sulawesi, Indonesia. Sampling took place at spring low tide from August to September 2017. Results: Two mantis shrimp species were observed: Lysiosquillina maculate and L. sulcata. Dense and sparse seagrass burrows did not differ in wall grain size or water parameters, both inside and outside of the burrows (P > 0.05). Similarly, there was no correlation between burrow depth and diameter in either dense (P > 0.05; r= 0.27) or sparse (P > 0.05; r= 0.33) seagrass. However, larger burrows tend to occur in denser beds, but there were more burrows in denser seagrass (t-test, P < 0.05). Conclusions: There seems to be a preference for dense seagrass beds, especially by larger mantis shrimps. The correlation between shrimp burrow abundance and seagrass density highlights the importance of conserving the quality as well as the extent of seagrass habitat.
... Moreover, lobster fishery resource assessment in major production areas in the Philippines has not been mapped out in broad-scale. Perhaps, the most recent published study about spiny lobsters was conducted by Abduho and Madjos (2018) where crustacean fishery, including spiny lobsters and crabs, in Basilan Province was described. Valuable biological and economic reference points however were not recently identified since the analysis of some population parameters of Arellano (1988). ...
Spiny lobster resource assessment was conducted in Eastern Visayas, Philippines from 2018 to 2019. Lobster catch was predominantly composed of Panulirus penicillatus (62%). This was followed by P. longipes (18%) and P. ornatus (18%) while, P. versicolor contributed negligible abundance (2%). P. penicillatus was most prevalent in waters exposed to the Pacific, while P. ornatus was most abundant in the northern Eastern Visayas. Lobster peak season occurs from March to May which coincides the summer months with calmer waters. The fishery was dominated by highly selective compressor diving (82%) that targets live and unspoiled lobsters, while a few came from gillnet (14%) and traps fishery (4%). Live lobsters contributed 70% of the total catch volume. Harvest estimates were 4300kg for 2018 and 6200kg for 2019, with peaks during March-May and September-November. CPUE has declined significantly from 0.75 to 0.32kg/fisher/day. Mode for lobster size were 50mm CL for P. penicilaltus and P. longipes; 60mm CL for P. versicolor; and 155mm for P. ornatus. Population dynamics: length at infinity (L∞) for P. penicillatus was 179mm and 187 mm (m/f); for P. ornatus, L∞ (m/f) =192/186mm; for P. longipes, L∞ (m/f) = 139/160mm, and; for P. versicolor, L∞ (m/f) = 160/155mm. Growth coefficient, K, were 0.18/0.22, 0.36/0.28, 0.21/0.22, and 0.17/0.10 for female and male P. penicillatus, P. ornatus, P. longipes and P. versicolor, respectively. Estimates on mortalities and exploitation rates indicate overexploitation of lobster stock in Eastern Visayas with P. penicillatus (E =0.7-0.8) and P. ornatus (E = 0.7) as the two most highly exploited species. Extrapolation on probability of catch sizes showed huge proportion of catches were juvenile and undersized lobsters except for P. ornatus. Recruitment pattern has a bimodal distribution with strong pulse of recruitment occurring in the 1st and 4th quarter of the year. Yield-per-recruit (Y’PR) analysis indicated non-maximization of potential yield for all species, except P. ornatus, mainly due to overexploitation of undersized individuals. The analysis suggests increasing the size at first capture by introduction of minimum legal size with annual increments to gradually realize optimal yield. In this manner, maximization of Y’PR can be attained from 3 to 9 years. This will not only lessen growth overfishing, but will also mitigate adverse economic impacts since the fishery apparently highly dependent on undersized lobsters. Reduction of exploitation levels may also be achieved by reinforced banning of compressor diving and strong restriction on catching ovigerous females.
Keywords: Stock assessment, spiny lobster, Panulirus spp., population dynamics, resource management
... [27,28] Marine crustaceans in southwestern Philippines are rich in abundance, particularly in Zamboanga City. [29] The most common throwaway shells from seafood restaurants in the locality are called "curacha" known as marine spanner crabs or red frog crabs (Ranina ranina) hence a good source of chitosan. This present study aims to utilize waste crab shells of R. ranina in obtaining acidified chitosan and tested against third instar A. aegypti larvae. ...
Dengue outbreaks cause elevated death toll yearly leading to human health concerns, particularly in tropical areas. The basic way to reduce mosquito densities is targeting its larval stage through alternative control management. This study investigates the use of chitosan, extracted from R. ranina crab shells obtained as common throwaways of seafood restaurants, as larvicide against A. aegypti. Powderized crab shells undergo through deproteinization and demineralization to make chitin and further converted into chitosan by deacetylation. Batches of 30 third instar larvae were used for each treatment prior for larvicidal bioassay. Mortality was recorded after 24 and 48 hr exposure. Data were pooled from all replicates for analyses. Regression analysis of log-probit was determined to calculate the lethal concentration (LC 50). Results revealed that acidified chitosan have increasing mortality rate of A. aegypti larvae as concentration increases. Among all treatments, 10000 ppm acidified chitosan possessed the highest toxicity effect against A. aegypti larvae and noticeably effective as the commercial larvicide. Acetic acid has no significant change in the mortality indicating that the larvicidal activity was due to the acidified chitosan. The LC 50 was estimated at 6654.181 and 4942.489 ppm after 24 and 48 hr, respectively. With longer exposure, repressed growth and disintegration of body tissues of A. aegypti larvae were observed. This may suggest that the acidified chitosan has a potential to disrupt metabolic responses and inhibit growth development. This study emphasizes the utilization of waste materials can be developed as good alternative larvicides that are environmentally safe and inexpensive.
Jumawan JH, Ruales JJJ, Avila MCA. 2022. New distribution record of Varuna litterata from Caraga Region, Philippines: Analysis on morphometry, length/width-weight relationship, and condition factor. Biodiversitas 23: 2935-2942. The study reported the occurrence of Varuna litterata in its habitat as a new record in Caraga Region, Philippines. The crab samples were collected using a hand-picked method and were of marketable sizes. There were 14 morphometric traits measured with the corresponding weight and sex of each specimen. Majority of the crab samples were medium-sized, with weight ranging from 11-20 grams, a carapace width range of 28-34 cm, and a carapace length range of 27-32 cm. Exploratory analysis of length /width-weight data fits the power regression model depicted into graphs. A strong relationship and highly significant was observed on pooled samples of WT-CW variables (R 2 : 0.9229: P<0.001) and WT-CL variables (R 2 : 0.9197); P<0.001). The derived log-transformed for WT-CW relationship was logWT:-2.7994+2.6456 logCW. Results suggest that carapace length and width tend to be smaller relative to the weight, which is an indication of a negative allometric growth pattern. The computed Fulton's condition factor was higher in males than females, as supported by Kruskal Wallis test (P<0.001). The data provides baseline information for comparing similar studies and in understanding the population dynamics of this crab species.
