Characteristics of purse seine fisheries in the Sulawesi Sea (case study in Tumumpa fishing port)

The purse seine is the dominant fishing gear operating at the Tumumpa Fishing Port with a vessel of >90%. The purse seines that have developed are large pelagic targets, with the main catch targets being skipjack, mackerel tuna, and tuna. Tuna, mackerel tuna and skipjack are important commodities for fisheries in Indonesia. This study aims to determine the characteristics of purse seine fishing gear and its catch in the Sulawesi Sea. Data collection was carried out for two years from 2019-2020 at Tumumpa Fishery Port. Indications for the use of fish resources are calculated by comparing the length-at-first-capture (Lc) with the length-at-first-mature (Lm). The results showed that purse seines are very dominant in exploiting large pelagic resources (skipjack, mackerel tuna and tuna) with the proportion reaching 78%, small pelagic (21% scads and 1% other fish). The large pelagic fishing season using the purse seine vessel occurs in May – November, with 2 peak seasons in July and September. While the small pelagic occurs in May – September, with the peak occurring in July. The size when the frigate tuna was first caught was at a fork length of 25.15 cm (Lc) and Lm in a size of 28.52 cm for females and 28.29 cm for males. Meanwhile, the first scads was caught (Lc) at a length of 21.4 cm with the length-at-first-mature (Lm) being 20 cm for the female and 19 cm for the male. Based on this analysis, it was shown that the purse seines is a selective fishing gear for small pelagic fish but not selective for large pelagic fish.

NEW RECORDS AND PRELIMINARY REPRODUCTIVE ASPECTS OF ELASMOBRANCHS OF THE TRINDADE-MARTIN VAZ INSULAR COMPLEX

Here we presented records of elasmobranchs obtained during a longline pelagic fishing monitoring around the Trindade-Martin Vaz insular complex, including one new record. New information on the reproductive aspects of the blue shark (Prionace glauca) and pelagic stingray (Pteroplatytrygon violacea) suggest the use of this area as mating and parturition ground for these species. The most abundant species was the P. glauca (N = 65), followed by shortfin mako shark Isurus oxyrinchus (N = 12). We also recorded for the first time the smooth hammerhead shark Sphyrna zygaena (N = 3) and the bigeye thresher shark Alopias superciliosus (N = 2), and other shark species previous reported for the insular complex, including the oceanic whitetip Carcharhinus longimanus (N = 2), and the tiger shark Galeocerdo cuvier (N = 1). Our findings highlight the importance of further studies at the Trindade-Martin Vaz insular complex considering the pelagic biodiversity and reproductive aspects of elasmobranchs.

Adaptive capacity of small pelagic fishing communities in coastal Tanga (Tanzania) to changes in climate-related phenomena

Studies examining the vulnerability, resilience and adaptation options of fisheries-dependent coastal communities have noted a decrease in viable options to respond effectively to the impacts of climate change. The extent of vulnerability is experienced in terms of varying capacity to respond to ecological changes through resource use practices. We analyzed the experiences of three coastal communities dependent on small pelagic fisheries in Tanga region, Tanzania, and their responses to the changing availability of fisheries resources. The study illustrates how conditions associated with upwelling, while not readily obvious to fishers, match some of their fishing strategies, with implications for fisheries-dependent livelihoods. Yet, the fishers’ perceptions are key determinants of the response options they adopt. Limited access to scientific knowledge also constrains the effectiveness of their response options. Our findings have important implications for the manner in which local and scientific knowledge systems can be integrated, particularly with regards to enhancing the adaptive capacities of coastal fishing communities through knowledge sharing.

Growth and Distribution of Frequency Long Fish (Decapterus sp) Catching Products In Iner And Outside Waters Of Bara Buru District - Maluku

The waters of Bara Bay as one of the small pelagic fishing areas in Buru Regency have considerable potential. Fishing efforts carried out by small fishermen using traditional fishing gear such as gill nets and long line have changed along with the development of fishing technology so that studies are needed related to standing stock and the dynamics of fish resource populations. This study aims to determine the growth and frequency distribution patterns of Layang fish (Decapterus sp) and to compare body lengths of fish caught outside the bay and in the bay of Bara. The result study showed that the highest frequency distribution of Layang (Decapterus sp) fish was outside the bay at 208-218 mm, and the location in the bay was 168-179 mm in length. The growth pattern of Layang fish (Decapterus sp) at both catchment locations (Outside Bay and in the bay) is negative allometric meaning that the length growth is faster than the weight growth.The relationship between fish length and weight was very strong with value R = 0.995 at the Outside Bay catchment area and an R = 0.983 value at the Inside Bay catchment location. There is a difference in the length of the Layang fish (Decapterus sp) caught outside the bay and inside the bay with a significant value of p<0.05 where the average length of the Layang fish (Decapterus sp) outside the Bay is greater (215.876 mm) than the average length of Layang fish (Decapterus sp) in the inside Bay (193.661 mm).

The Economic Value of Small Pelagic Fisheries in Indramayu Regency, West Java

This study aims to analyze the economic value of small pelagic fishing fisheries in Indramayu Regency, West Java. This research was conducted by a survey method using a questionnaire with a purposive sampling method and the data were analyzed descriptively quantitative and qualitative. The benefits of the results of this study are expected to provide information for decision making for the relevant government in formulating policies on fisheries activities, especially small pelagic fish in Indramayu Regency West Java so that they remain sustainable. Catching small pelagic fish is done by purse seine, mini purse seine, Millenium gill net, fishing line, and nylon net. The majority of the ship size used ships with sizes below 20 Gross Tonnage (GT). The types of small pelagic fish caught are Anchovy, Mackerel, Long Jawed Mackerel, Sardine, Scad, Sand Whiting, Tanjan Fish, Rucah Fish and Japuh Fish. The highest acceptance value of small pelagic fish in 2019 is found in anchovies, which is 8.997 billion. So that the highest profit of the highest small pelagic fish obtained in 2019 is found in Anchovy, amounting to 8,780 billion. The Benefit-Cost Ratio (BCR) calculation shows that the BCR value for catching pelagic fish species above is> 1 so that the fishing activity is feasible and can be continued. 99.7% of small pelagic fishing activities are influenced by the GT of the ship, the number of trips (months), and the fishing gear based on the calculation of multiple linear regression analysis.

Characterisation of season-wise spatial distribution of small pelagic fishery in Kerala, south-west coast of India

In this study, we attempted to identify and characterise the spatial variability of small pelagic fish abundance using geostatistical methods. The small pelagic fish abundance was estimated in terms of spatial parameters using generalised additive models (GAMs). The ring seine fishing grounds in the south-eastern Arabian Sea exhibited seasonal variability in distribution. Results of the study would help in prediction of the major pelagic fishing grounds for traditional fishers which would help in reducing fuel and time spent on searching for the fishing ground leading to sustainable exploitation. The prediction model can contribute to the management of pelagic fishery along the Kerala coast.