Population parameters and size at maturity of Callinectes arcuatus Ordway, 1863 (Decapoda, Portunidae) in Apozahualco Lagoon, Guerrero, Mexico

Crustaceana ◽  
2019 ◽  
Vol 92 (4) ◽  
pp. 397-414
Author(s):  
Jesús G. Padilla-Serrato ◽  
J. Gabriel Kuk-Dzul ◽  
Pedro Flores-Rodríguez ◽  
Rafael Flores-Garza ◽  
Nader Soriano-Reyes
Keyword(s):  
Coastal Lagoon ◽  
Performance Index ◽  
Gulf Of California ◽  
Fishery Management ◽  
Size Structure ◽  
Growth Parameters ◽  
Size At Maturity ◽  
Population Parameters ◽  
Mexican Pacific ◽  
Frequency Distributions

Abstract The objectives of this study were, to determine the population parameters of size structure, growth, cohorts, and recruitment for Callinectes arcuatus Ordway, 1863, as well as the size at maturity for females. We sampled each fortnight from September 2008 to February 2009 in the coastal lagoon Apozahualco, Guerrero, Mexico. Analysis of size frequency distributions showed three (September) and four (December) cohorts of juveniles. Estimated growth parameters were and , and the phi-prime growth performance index () was 4.2. Recruitment had the highest values during August and September. The size at maturity for females was 72 mm. In conclusion, values of for C. arcuatus were higher in the southern Mexican Pacific (SMP) than in the Gulf of California (GC); and this size at maturity for females followed a decreasing pattern from SMP to GC. These results are essential for fishery management of C. arcuatus in the SMP and GC.

Crustaceans from shrimp by-catch from the southeastern Gulf of California to the southeastern Mexican Pacific: implications in their community structure and reproduction

Crustaceana ◽  
2020 ◽  
Vol 93 (1) ◽  
pp. 89-109
Author(s):  
Jorge de Jesus Tirado-Ibarra ◽  
Stephanie Jimenez-Gutierrez ◽  
Cristina Acuña-Carvajal ◽  
Isabel Muñoz-Garcia ◽  
Francisco Martinez-Perez ◽  
...  
Keyword(s):  
Community Structure ◽  
Gulf Of California ◽  
Dominant Species ◽  
Size Structure ◽  
Negative Impact ◽  
Juvenile Stage ◽  
Fishing Vessel ◽  
Mexican Pacific ◽  
By Catch ◽  
First Maturity

Abstract In tropical countries, a large number of finfish species and invertebrates are captured as by-catch, including several species of crustaceans, due to the low selectivity of the fishing methods. By-catch presents and optimal opportunity to study populations of crustaceans. Here, the goal was to determine the community structure, specifically through the size structure, as well as the average sizes at first maturity of crustacean species present in the shrimp by-catch caught aboard a fishing vessel operating in the Mexican Pacific, from Sinaloa to Guerrero, Mexico. From the 18 crustaceans found in this study, the crabs Euphylax robustus and Achelous asper were the dominant species, whereas four species were considered casual (i.e., not frequent). Interestingly, more than 40% of the organisms analysed were in the juvenile stage, and 19% were ovigerous females. The results demonstrate the negative impact of the low selectivity of shrimp trawls on the communities of species of Crustacea.

scholarly journals Population parameters of main fishery resources in the basin of the Apure River, Venezuela (2000-2003)

2017 ◽  
Vol 41 (3) ◽  
pp. 447-458
Author(s):  
Alfredo Pérez-Lozano ◽  
Barbarino Aniello
Keyword(s):  
Fish Species ◽  
Growth Parameters ◽  
High Rate ◽  
Population Parameters ◽  
Commercial Fish ◽  
Frequency Distributions ◽  
Fisheries Resources ◽  
Starting Point ◽  
The Status ◽  
Commercial Species

Population parameters, performance index (∅) and exploitation rates (E = F/Z), of the 14 most important commercial fish species, in the Apure River, were estimated from length frequency distributions of commercial catches in the period 2000-2003. Growth parameters were used to determine the status of the principal fisheries resources of the Apure River. The analyzed species represented 83% of the total commercial species. The results showed a predominance of values relativity low of K and high L∞, common in longevity species. This data combined with the high values from estimations of Z and F showed a survival annual high rate and low stock tuner-over rate. The E estimations for the 14 fish species were high. E0,1 (0.50- 0.94). The overfishing indicators to four most fish species abundant (P. mariae, P. tigrinum, M. duriventre y H. littorale), showed that at least three species were heavy exploited. In general the analysis indicate that these 14 fish species have been strongly fished, and the data obtained is a starting point (as biological reference point) to be used for the assessment and management of fisheries resources in the Apure River.

scholarly journals Linking population size structure, heat stress and bleaching responses in a subtropical endemic coral

Coral Reefs ◽  
2021 ◽  
Author(s):  
Liam Lachs ◽  
Brigitte Sommer ◽  
James Cant ◽  
Jessica M. Hodge ◽  
Hamish A. Malcolm ◽  
...  
Keyword(s):  
Heat Stress ◽  
Size Structure ◽  
Temporal Trends ◽  
Early Recovery ◽  
Size Frequency Distribution ◽  
Frequency Distributions ◽  
Community Organisation ◽  
Size Frequency ◽  
Eastern Australia

AbstractAnthropocene coral reefs are faced with increasingly severe marine heatwaves and mass coral bleaching mortality events. The ensuing demographic changes to coral assemblages can have long-term impacts on reef community organisation. Thus, understanding the dynamics of subtropical scleractinian coral populations is essential to predict their recovery or extinction post-disturbance. Here we present a 10-yr demographic assessment of a subtropical endemic coral, Pocillopora aliciae (Schmidt-Roach et al. in Zootaxa 3626:576–582, 2013) from the Solitary Islands Marine Park, eastern Australia, paired with long-term temperature records. These coral populations are regularly affected by storms, undergo seasonal thermal variability, and are increasingly impacted by severe marine heatwaves. We examined the demographic processes governing the persistence of these populations using inference from size-frequency distributions based on log-transformed planar area measurements of 7196 coral colonies. Specifically, the size-frequency distribution mean, coefficient of variation, skewness, kurtosis, and coral density were applied to describe population dynamics. Generalised Linear Mixed Effects Models were used to determine temporal trends and test demographic responses to heat stress. Temporal variation in size-frequency distributions revealed various population processes, from recruitment pulses and cohort growth, to bleaching impacts and temperature dependencies. Sporadic recruitment pulses likely support population persistence, illustrated in 2010 by strong positively skewed size-frequency distributions and the highest density of juvenile corals measured during the study. Increasing mean colony size over the following 6 yr indicates further cohort growth of these recruits. Severe heat stress in 2016 resulted in mass bleaching mortality and a 51% decline in coral density. Moderate heat stress in the following years was associated with suppressed P. aliciae recruitment and a lack of early recovery, marked by an exponential decrease of juvenile density (i.e. recruitment) with increasing heat stress. Here, population reliance on sporadic recruitment and susceptibility to heat stress underpin the vulnerability of subtropical coral assemblages to climate change.

A Trophic Model for a Periodically Closed Coastal Lagoon System in the Southern Mexican Pacific

Wetlands ◽  
2021 ◽  
Vol 41 (5) ◽  
Author(s):  
Jesús M. López-Vila ◽  
Juan J. Schmitter-Soto ◽  
Ernesto Velázquez-Velázquez
Keyword(s):  
Coastal Lagoon ◽  
Mexican Pacific ◽  
Lagoon System

Pesticides in Water, Sediments, and Shrimp from a Coastal Lagoon off the Gulf of California

1999 ◽  
Vol 38 (9) ◽  
pp. 837-841 ◽  
Author(s):  
J.G Galindo-Reyes ◽  
V.U Fossato ◽  
C Villagrana-Lizarraga ◽  
F Dolci
Keyword(s):  
Coastal Lagoon ◽  
Gulf Of California ◽  
Pesticides In Water

scholarly journals Population dynamics of eastern little tuna (Euthynnus affinis) in Ternate Waters

2021 ◽  
Vol 890 (1) ◽  
pp. 012053
Author(s):  
U Tangke ◽  
R Laisouw ◽  
A Talib ◽  
Azis Husen ◽  
R Kota ◽  
...  
Keyword(s):  
Sustainable Management ◽  
Growth Parameters ◽  
Total Mortality ◽  
Fishing Effort ◽  
Population Parameters ◽  
Management Information ◽  
Growth Coefficient ◽  
Stable Growth ◽  
Euthynnus Affinis ◽  
Data Collection Procedure

Abstract Eastern little tuna production still depends on stocks from nature, so it is feared that if production continues to increase it will threaten the sustainability of tuna resources, therefore for the sake of sustainable management information is needed on population parameters so that research is carried out from January to April 2021 with the aim of assessing the dynamics of the population of these resources. The data collection procedure was carried out by measuring the total length of the fish caught per fishing trip for 4 months using a meter with a unit (centimeter) cm and an accuracy of 1 mm. The results of the research showed that tuna in the southern waters of Ternate Island had stable growth parameters including maximum length (L∞) 68.25 cm with a growth coefficient (K) of 0.25 per month, t0 -0.20, with total mortality, natural and fishing values respectively. respectively are 0.64, 0.43, 0.21 and the level of exploitation is 0.33 where this value indicates that the rate of exploitation is smaller so it is necessary to increase fishing effort until the optimum value reaches 0.38.

scholarly journals ASPEK BIOLOGI DAN PARAMETER POPULASI UDANG JINGA (Metapenaeus affinis H. Milne Edwards, 1837) DI PERAIRAN KOTABARU, KALIMANTAN SELATAN

2017 ◽  
Vol 9 (1) ◽  
pp. 11
Author(s):  
Tirtadanu Tirtadanu ◽  
Suprapto Suprapto ◽  
Ali Suman
Keyword(s):  
Growth Parameters ◽  
Growth Function ◽  
Fishing Effort ◽  
Population Parameters ◽  
Male And Female ◽  
Management Measures ◽  
Exploitation Rate ◽  
Mean Size ◽  
Biological Aspects ◽  
The Mean

Udang jinga (Metapenaeus affinis H. Milne Edwards, 1837) merupakan salah satu jenis udang ekonomis penting yang diusahakan di perairan Kotabaru dan saat ini produksinya cenderung mengalami penurunan. Salah satu data dan informasi yang diperlukan dalam mengkaji tingkat pemanfaatan dan dasar pengelolaannya adalah aspek biologi dan parameter populasi. Penelitian ini bertujuan mengkaji aspek biologi dan parameter populasi udang jinga sebagai bahan kebijakan pengelolaan perikanan udang di perairan Kotabaru, Kalimantan Selatan. Penelitian dilakukan pada bulan Januari – November 2016 di perairan Kotabaru. Parameter pertumbuhan diestimasi berdasarkan pergeseran modus struktur ukuran panjang dengan metode ELEFAN I. Hasil penelitian menunjukkan rata-rata ukuran udang jinga (M. affinis) betina yang tertangkap adalah 23,6 ± 3,45 mmCL dengan modus ukuran 24 mmCL dan rata-rata ukuran udang jantan adalah 20,7 ± 2,9 mm dengan modus ukuran 18 mmCL. Nisbah kelamin udang jinga jantan dan betina adalah 1 : 2,5. Musim pemijahan udang jinga diduga berlangsung sepanjang tahun dan puncak pada bulan Maret. Ukuran rata-rata pertama kali tertangkap (Lc) udang lebih kecil dari ukuran rata-rata pertama kali matang gonad (Lm) (21,7 < 28,5 mm CL) sehingga sebagian besar udang tertangkap berukuran kecil dan belum memijah. Persamaan pertumbuhan udang jinga jantan  CL(t)=35,95(1-e-2.02(t+0,31) dan udang jinga betina CL(t)= 38,3(1-e-1,92(t+0,29)). Tingkat pemanfaatan udang (E) menunjukkan lebih tangkap (overfishing) yakni 0,70/tahun pada jantan dan 0,73/tahun pada betina. Dengan demikian disarankan untuk melakukan pengurangan upaya penangkapan sebesar 40% dan penutupan musim penangkapan di bulan Maret.The jinga shrimp (Metapenaeus affinis H. Milne Edwards, 1837) was one of important commodity that was exploited in Kotabaru Waters, yet the production tend to be declined recently. The data and information on biological aspects and population parameters are needed to investigate the exploitation level and the basis of management measures. This research aims to investigate the biological aspects and population parameters of jinga shrimp Kotabaru waters, South of Kalimantan. This research was conducted on January – November 2016. The growth parameters were estimated as movement of length frequency mode by ELEFAN I method. The results showed that the mean size of female jinga shrimp (M. affinis) was 23,6 ± 3,45 mm CL and the mode was 24 mmCL. While, the mean size of male jinga shrimp was 20,7 ± 2.9 mm CL and the mode was 18 mmCL. The sex ratio of male and female shrimp was 1 : 2,5 . Spawning season of jinga shrimp was estimated throughout the year and the peak was in March. The length at first captured (Lc) was shorter than length at first matured (Lm) (21,7 < 28,5 mm CL). That means most of the catches was immature. The growth function of male and female jinga shrimp were and, CL(t)=35,95(1-e-2.02(t+0,31) respectively and CL(t)= 38,3(1-e-1,92(t+0,29)). The exploitation rate (E) of male and female shrimp fishing were  0,70/year 0,73/year, respectively. The reduction of fishing effort needed by 40% of the actual combined with the temporal fishing closure March.

Morphological and molecular characterization of two species of Gelidium (Gelidiales, Rhodophyta) from Mexico: G. nayaritense sp. nov. and the new record of G. sanyaense

Phytotaxa ◽  
2021 ◽  
Vol 527 (3) ◽  
pp. 161-176
Author(s):  
NATALY QUIROZ-GONZÁLEZ ◽  
MA. EDITH PONCE-MÁRQUEZ ◽  
NORMA LÓPEZ-GÓMEZ ◽  
DENÍ RODRÍGUEZ
Keyword(s):  
Gulf Of California ◽  
Phylogenetic Analyses ◽  
Distinct Species ◽  
Tropical Region ◽  
Mexican Pacific ◽  
Molecular Approaches ◽  
Diagnostic Characteristics ◽  
Morphological Differences ◽  
First Time

Gelidium pusillum is a species reported from the northern Gulf of California to the tropical region of the Mexican Pacific, but there is wide morphological variation among populations. The objective of this research was to evaluate of the Mexican species using morphological and molecular approaches, with the markers rbcL and COI-5P. This study examined 12 samples from four sites in the Mexican tropical Pacific. Phylogenetic analyses resolved these specimens within two clades separated from the topotype material of G. pusillum. The main morphological differences with other Mexican and phylogenetic closely related species were size, branching pattern, branching order, distribution of internal rhizoidal filaments, and shape of the tetrasporangial sori. The sequence divergences between these clades and the morphological differences support their representing distinct species so that Gelidium nayaritense sp. nov. is proposed for tropical specimens of the Mexican Pacific, whose diagnostic characteristics are the little or absent branching, its small size, as well as the presence of internal rhizoidal filaments concentrated in the subcortex, further G. sanyaense is register for first time from Mexico and Eastern Pacific.

Distribution patterns of the warrior swimming crab, Callinectes bellicosus, fishery in Bahía Magdalena, Baja California Sur, Mexico

Crustaceana ◽  
2019 ◽  
Vol 92 (11-12) ◽  
pp. 1279-1293 ◽  
Author(s):  
Juan C. Castro-Salgado ◽  
Mauricio Ramírez-Rodríguez ◽  
Gustavo-De la Cruz-Agüero ◽  
Verónica Castañeda-Fernández-de-Lara
Keyword(s):  
Gulf Of California ◽  
Coastal Lagoons ◽  
Warm Season ◽  
Distribution Patterns ◽  
Cold Season ◽  
Swimming Crab ◽  
Mexican Pacific ◽  
Temporal Behaviour ◽  
Average Size ◽  
Bahia Magdalena

Abstract Spatial and temporal distribution patterns of the warrior swimming crab Callinectes bellicosus fishery in the Mexican Pacific were investigated. Geo-referenced commercial trap capture data derived from 44 trips in the Bahia Magdalena were analysed. Three fishing zones (Z1, inner; Z2, middle; Z3, mouth of the bay) and two climate seasons (warm, July-December; and cold, January-June) were defined previously. There were 1099 traps in Z1, 715 in Z2 and 2111 in Z3; in the warm season, 2091 traps were checked, whereas 1834 were checked in the cold season. The average number of individuals per trap (CPUE) varied by sex, zone and season, however, male crabs always predominated. During the warm season, large males (CW > 115 mm) exhibited the greatest value of CPUE. On average, the males represented 77% during the warm season and 84% during the cold season. The average size of the males (125 ± 0.843 mm CW) was significantly higher than the average size of females (121 ± 1.140 mm CW). The catch was composed of large mature males but females were absent in Z1; in comparison, both large mature males and females, in addition to ovigerous females, composed the catch at the mouth of the bay (Z3). Crab abundance was notably reduced in the cold season, especially for female crabs. The temporal behaviour of the warrior swimming crab in Bahia Magdalena is similar to that reported from the coastal lagoons of the Gulf of California; however, the low presence of females throughout the year could be related to their preferred environmental conditions, which include deeper areas with more current circulation, like those that occur at the mouth of the bay. These data corroborate the necessity to interpret with caution the crab population dynamics solely based on results derived from fishing with traps in coastal lagoons.

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