Current status of the spiny lobster, Panulirus argus, fishery in the Los Roques Archipelago National Park, Venezuela

2001 ◽  
Vol 52 (8) ◽  
pp. 1615
Author(s):  
Mario Yallonardo ◽  
Mario Yallonardo ◽  
Juan M. Posada ◽  
Juan M. Posada ◽  
Daniella M. Schweizer ◽  
...  
Keyword(s):  
Size Distribution ◽  
National Park ◽  
Spiny Lobster ◽  
Panulirus Argus ◽  
Current Status ◽  
Total Catch ◽  
Catch Per Unit Effort ◽  
Fishing Season ◽  
Unit Effort ◽  
Lobster Fishery

Los Roques Archipelago National Park traditionally accounts for 95% of the total Venezuelan catch of Panulirus argus. Lobsters are caught in traps and by skin divers, during a 6-month fishing season (1 November to 31 April). The current status of the fishery was evaluated through a comparison of the 1998–99 lobster fishing season with previous studies. Thirty trap licences and 41 skin-diving authorizations were granted in 1998–99. Catch per unit effort was estimated as 2.31 kg/trap/month and 155.66 kg/diver/month, values similar to those from the 1983–1985 and 1986–1988 seasons. Total catch for the 1998–99 season was estimated as 139.31 tonnes (67.1% from traps), 47.78% higher than official reports. Estimated total catch, however, decreased by 40% from previous scientific evaluations. This decline has been attributed to a reduction in numbers of both trap licences and active traps. Size distribution of the 665 lobsters examined was not statistically different from that found in previous studies. The similarities in catch per unit effort and size distribution between the fishing seasons 1983–1985, 1986–1988, and the present study reflect a relatively stable fishery. The spiny-lobster fishery remains the main source of income of the fishers in the archipelago.

scholarly journals ASPEK BIOLOGI DAN MUSIM PENANGKAPAN LOBSTER (Panulirus spp) DI PERAIRAN KUPANG NUSA TENGGARA TIMUR

2018 ◽  
Vol 23 (3) ◽  
pp. 167
Author(s):  
Setiya Triharyuni ◽  
Ngurah N Wiadnyana
Keyword(s):  
Sex Ratio ◽  
Rainy Season ◽  
Spiny Lobster ◽  
Foreign Market ◽  
Market Demand ◽  
Total Catch ◽  
Fishing Season ◽  
Catch Data ◽  
Lobster Fishery ◽  
First Maturity

Lobster merupakan komoditas perikanan andalan yang banyak dieksploitasi di perairan Kupang untuk memenuhi permintaan pasar dalam dan luar negeri. Hal ini menyebabkan kegiatan penangkapan lobster berlangsung sangat intensif. Penelitian ini bertujuan untuk menganalisis aspek biologi dan musim penangkapan lobster. Data dan informasi yang dikumpulkan meliputi ukuran panjang karapas dan berat serta jenis kelamin tiap-tiap jenis lobster yang tertangkap serta hasil tangkapan dan upaya yang dilakukan secara bulanan. Data tangkapan lobster yang dianalisis dicatat selama periode Oktober 2015 - Desember 2016. Hasil penelitian menunjukkan bahwa  terdapat empat jenis lobster dari kelompok Palinuridae, yaitu lobster bambu (P. versicolor), lobster batu (P. penicillatus), lobster pasir (P. homarus) dan lobster mutiara (Panulirus ornatus). Berdasarkan jumlah individu, tangkapan lobster bambu mendominasi yaitu sekitar 60 % dari tangkapan total. Secara umum ukuran dari semua jenis lobster sesuai dengan ketentuan yang diatur dalam peraturan perundang undangan. Nisbah kelamin yang seimbang dan ukuran rata-rata pertama kali tertangkap lebih besar dari setengah panjang infinitif dan panjang pertama matang gonad menunjukkan bahwa sumber daya lobster masih layak untuk dieksploitasi. Musim penangkapan losbter di wilayah Kupang ini secara umum terjadi pada periode musim penghujan yang mulai dari September sampai Februari. Pembinaan kepada nelayan perlu ditingkatkan agar nelayan tetap patuh pada peraturan perundangan yang berlaku, bahkan dapat diikuti dengan nelayan di wilayah lainnya. Lobster fishery commodity in Kupang. Many lobsters are exploited in these waters to meet domestic and foreign market demand. This led to lobster fishing activities very intensive. The research on lobster resources was conducted to analyze the biology aspect and lobster fishing season. Data included, length of the carapace, individual weight, sex of lobsters and the monthly catches and efforts. The lobster catch data analyzed were recorded during the period of October 2015 - December 2016. The results show that there were four species of lobster from the Palinuridae group,i.e:the ornate spiny lobster (Panulirus ornatus), pronghorn spiny lobster (P. penicillatus), scalloped spiny lobster (P. homarus) and painted spiny lobster (P. versicolor). The catch was dominated by P. versicolor with 60% of the total catch. Generally the size of all lobster species with the regulation concerning the lobster fishing. The balance of sex ratio and the size of Lc of more than 0,5 of Land more than length at first maturity indicates that the lobster resource in Kupang and surrounding waters  is still exploited. The losbter fishing season is generally in the rainy season period from September to february. The increase of guidance to fishermen is needed to keep the fishermen the law and regulations, even can be followed by fishermen in other areas.

Trap-induced mortality of the spiny lobster, Panulirus argus, in Florida, USA

2001 ◽  
Vol 52 (8) ◽  
pp. 1509 ◽  
Author(s):  
Thomas R. Matthews
Keyword(s):  
Spiny Lobster ◽  
Panulirus Argus ◽  
Commercial Fishing ◽  
Fishing Mortality ◽  
Fishing Season ◽  
Fishing Vessels ◽  
Spiny Lobsters ◽  
The Subject ◽  
Lobster Fishery

In Florida’s lobster fishery, sublegal-sized spiny lobsters, Panulirus argus, are commonly placed in traps to attract legal-sized lobsters. Many died from exposure to air during transport before the use of live wells and still die because of confinement in traps. Much of this mortality is not apparent during normal trap-fishing operations, and the magnitude of the unobserved mortality remains the subject of controversy between fishermen and fishery managers. After fishermen began using live wells in the 1987–88 fishing season, the harvest of legalsized lobsters increased. Initially, the increase was smaller than predicted, apparently because the average number of traps in the fishery increased from 576 000 during the 1977–78 to 1986–87 fishing seasons to 854 000 during the 1987–88 to 1992–93 seasons. High numbers of traps in the fishery have been implicated as contributing to increased mortality of sublegal-sized lobsters. When the average number of traps was reduced to 605 000, after the 1993–94 season, the harvest predictions attributed to live-well use were largely achieved. Observations on commercial fishing vessels were used to reevaluate previous harvest predictions and develop additional coefficients for fishing mortality related to exposure and confinement in traps.

scholarly journals The effect of escape gaps of cylinder folding traps on fish catch at the coastal waters of Tuban Regency

2021 ◽  
Vol 322 ◽  
pp. 03002
Author(s):  
Farrel Nafis Adyatama ◽  
Ghassan Nurul Huda ◽  
Nahla Alfiatunnisa ◽  
Faizal Rachman ◽  
Supardjo Supardi Djasmani ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Marine Organisms ◽  
Total Weight ◽  
Total Catch ◽  
Catch Per Unit Effort ◽  
Unit Effort ◽  
Significant Difference ◽  
Fish Catch ◽  
Swimming Crabs

The purpose of this study is to determine the effect of the escape gap of cylinder folding trap on catch per unit effort (CPUE), trap rate, composition, and size of fish caught in the coastal waters of Tuban Regency. The research was conducted in November 2019 by deploying 60 units in ten experimental fishing trips at different locations. The traps were 20 units without escape gap, 20 units with an escape gap of 3 cm x 6 cm, and 20 units with an escape gap of 4 cm x 7 cm. Overall, the experiments resulted in a collection of 22 species of marine organisms, such as swimming crabs (33% of total weight), snails, shrimps, crabs, fishes (55% of total weight), and cuttlefish. The highest CPUE was found for the traps with escape gaps of 4 cm x 7 cm, i.e., 9.18 gr/trap/trip. There was no significant difference in the total catch, the weight of catches, trap rate, and catch per unit effort (CPUE) among the three types of traps.

Fecundity dynamics of female spiny lobster (Panulirus argus) in a south Florida fishery and Dry Tortugas National Park lobster sanctuary

2001 ◽  
Vol 52 (8) ◽  
pp. 1559 ◽  
Author(s):  
Rodney D. Bertelsen ◽  
Thomas R. Matthews
Keyword(s):  
National Park ◽  
Egg Production ◽  
Size Structure ◽  
Spiny Lobster ◽  
South Florida ◽  
Reproductive Season ◽  
Panulirus Argus ◽  
Chronological Age ◽  
Dry Tortugas ◽  
Spiny Lobsters

Using diver surveys, we compared the size structure, fecundity, and reproductive season of spiny lobsters (Panulirus argus) in the Dry Tortugas National Park lobster sanctuary with those of spiny lobsters in the south Florida fishery. The number of lobsters of both sexes larger than the legal size limit declined sharply in the fishery but not in the sanctuary. Clutch sizes were larger in the Dry Tortugas sanctuary, averaging 0.8 million, than in the fishery, averaging 0.3 million. The reproductive season was shorter and more intense in the sanctuary than in the fishery. In addition, lobsters in the sanctuary begin producing eggs at a larger size and produce more eggs per gram of body mass than lobsters in the fishery. Peak egg production occurs earlier in larger lobsters than in small ones. Establishing a fundamental reason for the differences between lobster reproduction in the sanctuary and that in the fishery is not possible until the chronological age of lobsters can be determined, but one hypothesis consistent with these differences is that, if lobsters reproduce at a certain chronological age, then sublethal fishery practices may account for slower growth for some lobsters resulting in some smaller but older reproductively active lobsters.

scholarly journals Effect of hook and bait type on catch per unit effort in the Aegean Sea demersal longline fishery

2021 ◽  
Vol 38 (2) ◽  
pp. 181-188
Author(s):  
Ozan Soykan ◽  
Cemil Sağlam ◽  
İlker Aydın ◽  
Hasan Tuncay Kınacıgil
Keyword(s):  
Sparus Aurata ◽  
Length Distribution ◽  
Aegean Sea ◽  
Fishing Effort ◽  
Longline Fishery ◽  
Total Catch ◽  
Catch Per Unit Effort ◽  
Unit Effort ◽  
Catch Composition ◽  
The Impact

This study aimed to determine the impact of hook and bait type on the catch composition and catch per unit effort. Effects of hook and bait types on catch composition, catch per unit effort (CPUE), length and weight distributions in demersal longline fishery were determined by experimental surveys on demersal longline sets in the Aegean Sea. A total of 12 samplings corresponding to 4800 hook fishing effort were performed between April 2014 and September 2014. Two bait types; sardine (Sardina pilchardus) and grooved razor shell (Solen marginatus) and two hook types; J-hook and C-hook were tested. CPUE values were calculated for each species and assessed between different hook-bait combinations. A total of 623 individuals were captured belonging to 3 families and 9 species. It was found that more than 60% of total catch was captured by grooved razor shell and more than 50% of the total catch was caught with J type hook. J hook was found to be close to significant (p=0.06) and grooved razor shell was found significant (p=0.02) for CPUE. The effect of bait type was found to be more significant than that of hook type for CPUE and length distribution. Hook-bait combination differed according to species and C hook baited with sardine was determined to be the best combination for Sparus aurata as the most targeted fish in the study area. Discard ratio was calculated to be 34% in terms of weight and 42.5% in terms of total number of individuals for pooled data. The condition value (K) of the species ranged from 1.05 to 1.68 and differed according to bait type. Most of the high commercial value species caught with any hook-bait combination experimented within this study are larger than minimum fishing length according to minimum landing size regulations of Turkish fishery and maturity studies.

scholarly journals Comparación entre dos modelos estructurados por edades, aplicados a la pesquería de langosta, Panulirus Argus (Latreille, 1804), en la región suroriental de Cuba

2012 ◽  
Vol 3 ◽  
pp. 131
Author(s):  
Romina Alzugaray Martínez ◽  
Rafael Puga Millán
Keyword(s):  
Linear Models ◽  
Population Analysis ◽  
Spiny Lobster ◽  
Information Criterion ◽  
Fishing Effort ◽  
Panulirus Argus ◽  
Catch Per Unit Effort ◽  
Raw Data ◽  
Linear Relationships ◽  
Exploitation Status

La langosta común, Panulirus argus, es una de las especies con mayor valor comercial en el Atlántico Centro Occidental. En Cuba se han realizado numerosos estudios para conocer y actualizar su estado de explotación y recomendar medidas de manejo. A pesar de estas medidas, las capturas continúan disminuyendo, por lo que el objetivo del presente estudio consistió en evaluar la dinámica de la población de langosta en la región suroriental de Cuba, a través de dos estrategias analíticas diferentes. A partir de datos de captura y esfuerzo pesquero de 1979-2010, se aplicaron un análisis de población virtual (VPA) y un análisis estadístico de captura por edades (SCA). Se examinó la relación lineal entre los datos primarios y las variables estimadas por los modelos. El ajuste de los modelos lineales de los datos se evaluó mediante el Criterio de Información de Akaike corregido (AICc). Según ambos métodos de captura por edades, el tamaño poblacional y el reclutamiento de langostas con un año de edad han disminuido en la región en el período estudiado, aunque el SCA muestra estabilización en la última década. Mientras, la biomasa poblacional disminuyó hasta estabilizarse en la última década, lo cual puede relacionarse con el comportamiento histórico de la captura por unidad de esfuerzo. Existen asociaciones lineales significativas entre los datos primarios y las variables estimadas. Según los valores de Δi, el modelo VPA garantiza el mejor ajuste de las variables a las relaciones lineales estimadas. Abstract Spiny lobster, Panulirus argus, is one of the most commercially valuable species in the Western Central Atlantic. Although numerous studies have been conducted in Cuba to learn and update its exploitation status and to recommend management measures, catches continue to decline. Consequently, the objective of this study was to evaluate the dynamics of the lobster population in Cuba’s southeastern region, through two different analytical strategies. Using catch and fishing effort data from 1979-2010, a Virtual Population Analysis (VPA) and a Statistical Catch-at-age Analysis (SCA) were applied. We examined the linear relationship between raw data and the variables estimated by the models. The fit of the linear models to data was assessed using the corrected Akaike Information Criterion (AICc). According to both age-structured methods, population size and recruitment of one year old lobster have declined in the region during the study period, although the SCA shows stabilization in the last decade. Population biomass decreased to stabilize in the last decade, this may relate to the historical behavior of the catch per unit effort. There are significant linear associations between raw data and estimated variables. According to Δi values, the VPA model ensures the best fit for the variables of estimated linear relationships.

Gear and Seasonal Bias Associated with Abundance and Size Structure Estimates for Lentic Freshwater Fishes

2014 ◽  
Vol 5 (2) ◽  
pp. 394-412 ◽  
Author(s):  
Jesse R. Fischer ◽  
Michael C. Quist
Keyword(s):  
Size Distribution ◽  
Freshwater Fish ◽  
Sampling Methods ◽  
Size Structure ◽  
Micropterus Salmoides ◽  
Lepomis Macrochirus ◽  
Catch Per Unit Effort ◽  
White Bass ◽  
Unit Effort ◽  
Ecological Importance

Abstract All freshwater fish sampling methods are biased toward particular species, sizes, and sexes and are further influenced by season, habitat, and fish behavior changes over time. However, little is known about gear-specific biases for many common fish species because few multiple-gear comparison studies exist that have incorporated seasonal dynamics. We sampled six lakes and impoundments representing a diversity of trophic and physical conditions in Iowa, USA, using multiple gear types (i.e., standard modified fyke net, mini-modified fyke net, sinking experimental gill net, bag seine, benthic trawl, boat-mounted electrofisher used diurnally and nocturnally) to determine the influence of sampling methodology and season on fisheries assessments. Specifically, we describe the influence of season on catch per unit effort, proportional size distribution, and the number of samples required to obtain 125 stock-length individuals for 12 species of recreational and ecological importance. Mean catch per unit effort generally peaked in the spring and fall as a result of increased sampling effectiveness in shallow areas and seasonal changes in habitat use (e.g., movement offshore during summer). Mean proportional size distribution decreased from spring to fall for white bass Morone chrysops, largemouth bass Micropterus salmoides, bluegill Lepomis macrochirus, and black crappie Pomoxis nigromaculatus, suggesting selectivity for large and presumably sexually mature individuals in the spring and summer. Overall, the mean number of samples required to sample 125 stock-length individuals was minimized in the fall with sinking experimental gill nets, a boat-mounted electrofisher used at night, and standard modified nets for 11 of the 12 species evaluated. Our results provide fisheries scientists with relative comparisons between several recommended standard sampling methods and illustrate the effects of seasonal variation on estimates of population indices that will be critical to the future development of standardized sampling methods for freshwater fish in lentic ecosystems.

scholarly journals The Caribbean spiny lobster (Panulirus argus) fishery in Cuba: current status, illegal fishing, and environmental variability

2018 ◽  
Author(s):  
Romina Alzugaray ◽  
Rafael Puga ◽  
Roberto Piñeiro ◽  
María Estela de León ◽  
L Susana Cobas ◽  
...  
Keyword(s):  
Environmental Variability ◽  
Spiny Lobster ◽  
Panulirus Argus ◽  
Current Status ◽  
Illegal Fishing ◽  
The Caribbean

Settlement of Spiny Lobster, Panulirus argus, Pueruli in South Florida: An Evaluation from Two Perspectives

1986 ◽  
Vol 43 (11) ◽  
pp. 2221-2227 ◽  
Author(s):  
J. M. Marx
Keyword(s):  
Shallow Water ◽  
Carapace Length ◽  
Spiny Lobster ◽  
Red Alga ◽  
South Florida ◽  
Panulirus Argus ◽  
Seasonal Trends ◽  
Lobster Fishery ◽  
Mangrove Roots

Settlement of spiny lobster, Panulirus argus, pueruli occurs year-round in south Florida, but seasonal trends are not consistent. Recruitment peaks are common in spring but sometimes occur in other seasons. Postsettlement dynamics of seasonal settlement classes must be determined to establish a relationship between puerulus abundance and subsequent fishery yield. Pueruli settle in various shallow-water habitats, including masses of the red alga Laurencia, algal-covered mangrove roots, and colonies of the bryozoan, Bugula. Settlement habitats of 0.04–2 ha can produce 1906–3913 juveniles (20 mm carapace length) annually. Management must protect these critical habitats to assure productivity of the spiny lobster fishery.

scholarly journals Reliability of a model based on a short fishery statistics survey: application to the Northeast Atlantic monkfish fishery

2004 ◽  
Vol 61 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Francisco Rocha ◽  
Joaquín Gracia ◽  
Ángel F González ◽  
Carlos M Jardón ◽  
Ángel Guerra
Keyword(s):  
Fishing Ground ◽  
Total Catch ◽  
Market Information ◽  
Catch Per Unit Effort ◽  
Northeast Atlantic ◽  
Model Based ◽  
Fish Market ◽  
Unit Effort

Abstract A model based on a short fishery statistics survey was applied to estimate catch and catch per unit effort (cpue) of the Galician monkfish (Lophius spp.) trawl fleet during 1998. In all, 35 interviews were conducted with fisheries personnel in ICES Divisions IXa, VIIIc, VIIId, and VIIIe (coastal offshore fishing grounds) and 44 in VIIb, VIIc, VIIj, and VIIk (Grand Sole fishing ground). Reliability of the model estimates was tested using: (i) registered fish market landings at 38 ports; (ii) landings data from sale invoices at six of these ports (93.8% of total landings of the species); (iii) 29 observers' trips made on board coastal offshore trawlers and the logbook of one Grand Sole trawler. Estimated mean total catch from the model was 5110 t (602 t coastal offshore, 4508 t in Grand Sole) and cpue values were 36.2 kg haul−1 vessel−1 coastal offshore and 104.4 kg haul−1 vessel−1 Grand Sole. Differences between the values of cpue estimated by the model and those determined directly in both fisheries were not significant. However, there were differences between the total catch estimated by the model and the total landings deduced from sale invoices and Galician fish market information.

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