INIDEP Informe Técnico

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Alimentación de la merluza (Merluccius hubbsi) en el Golfo San Jorge y aguas adyacentes
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Sánchez, F.
The information obtained in summer research cruises carried out in 1995, 1999 and 2002 allowed to determine the trophic spectrum of common hake (Merluccius hubbsi) and to estimate anchovy (Engraulis anchoita) and hake consumption in the nursery area of the San Jorge Gulf and shelf adjacent waters (Argentine Sea, SW Atlantic). The area surveyed extended from 44ºS to 47ºS and between the 50-100 m isobaths. In the stomach content the most frequent items were crustaceans followed by fish. In all size groups sampled the presence of anchovy and common hake was observed. In the area assessed consumption of anchovy, weighted for the three summer months of 1995 was 56,639 t. The greatest predation pressure was observed on classes between 14-16 cm TL. Hake consumption estimated at 16,797 t in summer 1995 reached 36,456 t in 2002. The average length of common hake preys was 16 cm TL in 1995 and 13 cm TL in 2002.
Análisis de la utilización de la captura por unidad de esfuerzo de pescadilla de red (Cynoscion guatucupa) como índice de abundancia anual. Período 1992-2004
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Perrotta, Ricardo G.; Ruarte, Claudio
The stripped weakfish (Cynoscion guatucupa) caught in Brazil, Uruguay and Argentina (SW Atlantic) has a wide latitudinal distribution (22° S-43° S). In Argentina there are two main fishing areas, the Argentine-Uruguayan Common Fishing Zone and 'El Rincón', southern zone of the Buenos Aires littoral. The importance of the species makes it necessary to define an annual abundance index that would allow to diagnose the state of the stock. The model adjusted to calculate the index is the General Linear Model. The factors used were Year, Quarter, Length, Stratum (4 categories) and sub-areas (5 categories), all statistically significant. The problem generated by the presence in the model of first order interactions that include the Year factor is discussed. The importance of said interactions is assessed pursuant to the percentage of variance explained considering the model with and without such interactions. It is concluded that the catch per unit of effort series reflects space-temporal changes in the fleet activity not proportional to the biomass.
Análisis de las capturas de atunes realizadas por dos buques pesqueros de Mar del Plata, Argentina, entre enero y abril de 2010
(INIDEP, 2011) Garciarena, A. David
Data obtained by observers on board of two fishing vessels during six trips carried out between January-April 2010 to catch tuna were analyzed. Thirty-four fishing days were completed and of the 59 trawls performed 37 turned out positive (with tuna catches). The fishing gear consisted of a purse seine net. Exploitation took place within the Argentine-Uruguayan Common Fishing Zone, between 36° S-39° S. The main landings occurred in March and consisted of slender tuna, Allothunnus fallai (57%), followed by albacore, Thunnus alalunga (28.5%), in January and bonito, Sarda sarda (14%), in April. Sea surface temperature ranged 16 °C-19 °C. A total of 25 length frequency samples allowed to measure individuals of the species above mentioned and those of skipjack tuna (Katsuwonus pelamis). During fishing operations the death of some magellanic penguins (Spheniscus magellanicus) and soft-plumaged petrels (Pterodroma mollis) as well as catch of anchovy (Engraulis anchoita) were registered
Clave de identificación de cápsulas de huevos de condrictios del Mar Argentino
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Mabragaña, Ezequiel; Figueroa, Daniel E.; Scenna, Lorena B.; Díaz de Astarloa, Juan Martín; Colonello, Jorge H.; Massa, Ana M.
Twenty eight species of oviparous chondrichthyans were reported on the Argentine Continental Shelf (SW Atlantic). The egg cases laid on the sea bed provide useful information to identify species, eggs laying areas and seasons. Based on the analysis of 155 egg cases corresponding to 21 chondrichthyan species, an illustrated field guide for a correct identification is presented.
Las condiciones oceanográficas en el área marplatense (37° 00' S-38° 24' S) y su relación con la distribución de la caballa (Scomber japonicus). Octubre-noviembre de 1999
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Reta, Raúl; Perrotta, Ricardo G.; Garciarena, A. David
Results obtained during a research cruise carried out along the coastal area of Mar del Plata (Buenos Aires, Argentina) in November 1999 are presented. The objective of the research cruise was to estimate chub mackerel (Scomber japonicus) abundance with acoustic methods and establish its relation to the hydrographic conditions. The information gathered was complemented with data of catches obtained by a commercial vessel that operated simultaneously in the study area. Environmental data from other research cruises and satellite information were also taken into account to obtain contemporary sea surface temperature and wind speed and direction data. The main species of catches of the research cruise and commercial vessel were horse mackerel (Trachurus lathami) and anchovy (Engraulis anchoita). No chub mackerel was detected during the acoustic assessment; however, the species was caught by the commercial vessel in the southern part of the study area and near the thermohaline front. Chub mackerel yields were very low if compared to those regularly recorded in the area and time the purse-seine fleet operates and that are typical of an advanced fishing season (January). The advection of estuarine waters from the de la Plata river, conditioned by the winds field, generated the displacement of low salinity waters over the coastal area that surpassed the regular southern limits. The positive anomalies of sea surface temperature in the region, that reached values close to 3 °C, could have caused the partial exclusion of chub mackerel in the coastal region of Mar del Plata.
Crecimiento de la merluza (Merluccius hubbsi) del Atlántico sudoccidental entre 1993-2003 al norte y sur de 41º S
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Renzi, Marta A.; Santos, Betina A.; Abachian, Viviana E.
The reading of otoliths sagittae collected during the INIDEP (National Institute for Fisheries Research and Development, Argentina) assessment cruises carried out in the 1993-2003 period allowed to estimate length and weight growth parameters and the condition factor of hake (Merluccius hubbsi) and to prospect the two management units of the species north and south of 41ºS (Argentine Sea, SW Atlantic). A great variability in total length and weight in each age group was observed; nevertheless, stable mean length and weight values per age group were observed in the period analyzed. Besides, the values estimated to determine possible growth variations in each and between both management units north and south of 41ºS were compared. The comparison of growth curves of males and females in each area showed highly significant differences. When each sex between stocks was compared, some years those differences were observed for growth as a whole and only for some parameters in others.
Distribución de desovantes y estimación de variables reproductivas del efectivo norteño de merluza (Merluccius hubbsi) (35º'S-41º'S) durante mayo de 2009
(INIDEP, 2011) Rodrigues, Karina A.; Macchi, Gustavo J.
Spawning and reproductive variables of the northern hake stock were analyzed using macroscopic and histologic gonad information derived from samples collected in May 2009. The study includes estimates of batch fecundity, spawning frequency, oocyte dry weight and size at first maturity. During May 2009 the reproductive activity of the northern hake stock took place mainly near the 50 m isobath, north of 37° S. Spawning occurred within a temperature range of 9 °C-15 °C that coincided with a bottom thermal front. Size at first maturity, much lower than that reported at the beginning of the 1980s, showed differences between males (27.16 cm TL) and females (32.84 cm TL). The reproductive frequency was estimated at one spawning every 13 days and mean batch fecundity (764,545 oocytes) resulted higher than in April 2003. Likewise, oocyte dry weight exceeded that of April 2003, which might be associated to the size composition of each reproductive group
Distribución y abundancia de huevos y larvas de langostino patagónico (Pleoticus muelleri) (Penaeoidea, Solenoceridae) en las temporadas estivales de 2008 y 2009
(Mar del Plata : Instituto Nacional de Investigación y Desarrollo Pesquero INIDEP, 2011) Moriondo Danovaro, Paula I.
The study on distribution and abundance of eggs and early planktonic stages of red shrimp, Pleoticus muelleri (Bate, 1888), contributes to a better knowledge of the species dynamics. Results from processing and analyzing 72 plankton samples collected with Bongo net during two research cruises on board of FV “Arbumasa XVIII” and RV “Capitán Oca Balda”, carried out in the Patagonian littoral in March 2008 and January 2009, are presented. In both cruises, eggs and larval stages were found all over the study area. The highest punctual densities of eggs were recorded in the area known as “La Pared” (46° 45’ S-65° 55’ W and 46° 50’ S-65° 55’ W). Eggs indicate the presence of shrimp reproductive concentrations which, while migrating eastwards towards waters of national jurisdiction, generate production scenarios characterized by high rates of catch per unit of effort and better commercial sizes. In the 2009 cruise, high densities of shrimp eggs were also found near Rawson area.
Estadística pesquera de peces demersales australes en el Atlántico Sudoccidental (período 1980-2002)
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2007) Gorini, Federico L.; Di Marco, Emiliano; Wöhler, Otto C.
Fishery statistics of austral demersal fishes in the Southwest Atlantic (1980-2002 period). A synthesis of the information available about catches of austral demersal fishes and fishing efforts reported by different fleets that operated in the SW Atlantic between 34° S-58° S in the 1980-2002 period is made. Species included in the analysis were southern blue whiting (Micromesistius australis), patagonian hoki (Macruronus magellanicus), patagonian toothfish (Dissostichus eleginoides), red cod (Salilota australis), southern hake (Merluccius australis) and ling (Genypterus blacodes). Annual and monthly catches, fishing grounds, number of vessels that participated in the fisheries, main landing ports and other characteristic of interest are presented. When it was necessary to correct official statistics, data bases were modified per fishing area and type of fleet using different catches differentiation criteria
Estimación de un índice de abundancia anual de gatuzo (Mustelus schmitti) a partir de datos de la flota comercial argentina. Período 1992-2008
(INIDEP, 2011) Pérez, M.; Massa, Ana M.; Cordo, H.D.
Patagonian smoothhound (Mustelus schmitti) is one of the predominant cartilaginous fishes of the Argentine Sea (SW Atlantic Ocean). It is caught, mainly, in the coastal multispecific fishery with nearly other 30 bony and cartilaginous species. The group is known as ‘variado costero’. In this work the smoothhound abundance indices (CPUE) and standardized efforts for the 1992-2008 period in the area between 34~’S-42~’S were estimated. The General Lineal Model (GLM) and data derived from the argentine commercial fleet were used. Other aspects that could affect estimates and trends of the annual indices were also analyzed. Mean CPUE values estimated with the GLM, considered as annual standardized abundance indices, show an increasing trend as of 2000; the highest relative levels correspond to the last three years of the study period
Estimación de un índice de abundancia anual estandarizado para pescadilla de red (Cynoscion guatucupa), mediante la aplicación de un modelo lineal general; período 1992-2003
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2007) Ruarte, Claudio; Perrotta, Ricardo G.
The stripped weakfish (Cynoscion guatucupa) has a wide latitudinal distribution (22° S-43° S) and it is object of fishery in Brazil, Uruguay and Argentina (SW Atlantic). In this last country, it is mainly captured in the coastal region of Buenos Aires Province by means of a fleet, which has between 20 m and 30 m length. In Argentina, the average landings in the last 5 years were 9,900 t. It is the second commercial species among the coastal groups. There are two main fishery areas of this species: the Argentinean-Uruguayan Common Fishing Zone (AUCFZ) and the El Rincón area, in the South of bonaerense littoral. Due to the importance of this species, it is necessary to define an index of annual abundance to allow a suitable diagnosis of the fishery condition. The General Linear Model is a suitable model to calculate this index. The factors used in this work were: year, trimester, 4 length categories and 5 sub areas. All of them were significant and reflect spatial-temporal changes in the abundance of this species. The model explained 34% of the total variability in the AUCFZ and 46% in the El Rincón. In general, the trends of catch per unit effort (CPUE) were similar and increasing in both areas, registering a greater increase in the internal areas. On the other hand, the fleet displacements between the areas and the reduction of the total fishery area caused a rise in the annual CPUE and a fall of the captures. These captures were dominated by adults but with an important presence of juveniles in the coastal zone off Mar del Plata city.
Estimaciones de la biomasa de merluza (Merluccius hubbsi) en los sectores argentino y uruguayo de la Zona Común de pesca argentino-uruguaya (34º 00º S-39º 30º S) Y en el área que se extiende hasta 41º S (ZEE Argentina) en 1994, 1996-2001 y 2003
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Bezzi, S.I.; Ibáñez, P.M.
Hake (Merluccius hubbsi) biomass in the Argentine and Uruguayan sectors of the Argentine-Uruguayan Common Fishing Zone (AUCFZ) and in the area that extends from the limit of the shared zone to 41° S was estimated (SW Atlantic Ocean). The contribution to the strata total biomass in each sector was analyzed and complemented with observations on the structure of the population. The basic data to estimate biomass derived from the evaluation surveys of the Hake Project carried out in winter or spring 1994, 1996-2001 and 2003. In 1999 biomass north of 41° S decreased to 30. (112,280 t) of the estimates made for 1994. In 2000 it increased to 165,000 t and in 2003 it was estimated at 156,407 t. A remarkable decrease of the AUCFZ percentage of contribution to the total biomass north of 41° S was registered. The result was an increase of the contribution corresponding to the intermediate zone that in 2003 contributed 54. of the total biomass. The modal class was equal to or smaller than 25 cm in the Uruguayan sector, between 13-37 cm in the Argentine sector and smaller than 35 cm in the intermediate zone where it reached 22 cm in 2000 and 27 cm in 2001. The rest of the years it varied between 38-41 cm. In the intermediate zone the average length and the modal class were larger than in the AUCFZ sectors.
Evaluación de merluza de cola (Macruronus magellanicus) en el Atlántico Sudoccidental. Período 1985-2001
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2007) Wöhler, Otto C.; Hansen, J.E.; Giussi, Analía R.; Cordo, H.D.
Period 1985-2001. A stock assessment of Patagonian hoki of the Southwest Atlantic was carried out by using data from the years 1985-2001. A cohort analysis, fitted with some survey abundance indices was used in an adaptive conceptual framework. Simulation trials were performed to project the evolution of the fishery, to evaluate the risk of over-fish the stock under different exploitation levels, and to estimate Biologically Acceptable Catches (BAC). Both total biomass and spawning stock biomass showed increasing trends resulting from four strong year classes (1993, 1995, 1996 and 1998). Total biomass at the beginning of 2001 was estimated to be 2.5 million tons, and spawning stock biomass at the spawning time (August) was estimated to be around 1.28 million tons. The exploitation rate was low (0.19) and showed a decreasing trend in relation to previous years. The fishing mortality rate producing sustainable total catches in the long term, i.e., BAC corresponded to yields between 160 and 306 thousand tons during 2002, depending on future levels of recruitment
Evaluación de polaca (Micromesistius australis) en el Atlántico Sudoccidental. Período 1987-2001
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2007) Wöhler, Otto C.; Hansen, J.E.; Cassia, M.C.; Cordo, H.D.
Period 1987-2001. A diagnosis of the current state of Southern blue whiting (Micromesistius australis) stock in the Southwest Atlantic was carried out on the basis of catches corresponding to the period 1987-2001 as reported by the Argentine fleet and also by vessels operating around Malvinas Islands. Abundance and current fishing mortality rates were estimated, and the biomass evolution in the long term resulting from some possible exploitation strategies based on different management strategies were projected. A sequential population analysis calibrated under a conceptual adjustable framework with five independent abundance indices was carried out. The effects on the biomass estimates were analysed by adopting different selection patterns and calibration indices as well as taking into account the under-declaration and discard of catches. Results indicated that the declining trend of Southern Blue Whiting observed in previous studies has continued, but it has been less marked than in preceding years. Total biomass estimates at the beginning of 2001 ranged between 566 and 622 thousand tonnes, whether the under-reporting or discards of catches by the Argentine fleet were taken into account or not. Accordingly, the spawning biomass at the onset of spawning ranged between 403 and 442 thousand tonnes. These values would correspond to 27-29% of the virgin biomass. Current fishing mortality was estimated as 0.27, corresponding to a relatively high exploitation rate (0.56). Projections aimed at four possible management objectives showed that biologically acceptable catches would range 22-84 thousand tonnes in 2002. Catches in the Southwest Atlantic should not exceed 50 thousand tonnes during 2002 in order to stop the declining trend of Southern blue whiting biomass.
Evaluación del recurso abadejo y recomendaciones sobre su explotación a partir del año 2002
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2007) Cordo, H.D.
Ling (Genypterus blacodes) resource was assessed by means of an age structured production model fitted with stock abundance indices from catch per unit effort data (CPUE) obtained from the commercial fishing fleet. Reproductive stock was assessed in the same way with CPUE data from the fishery research vessel. A short-term analysis of collapse risk as a function of 1999 and 2000 fishing mortalities was carried out with the results, and also a long-term analysis with the assumption of a variable fishing mortality (F) with two recruitment hypotheses. Results show that the present state of the Ling resource has worsened with respect to the last assessment. Considering the best of all cases, the Br/Kr relationship decreased from 0.55 to 0.33, indicating that the reproductive stock is near the acceptable limit assumed in this paper. Risk analysis pointed out that catch should be kept at a level of 16,000 t year-1 in the long term to maintain collapse risk within acceptable levels ( 10%). This would imply decreasing total allowable catch levels, currently at 19,000 t year-1. Nevertheless, since Ling is in great proportion, a by-catch of the common hake fishery, catch levels are regulated to a great extent by the effort directed to hake. In addition, it was observed that Ling catch by longliners increased from 137 t in 1998 to 3.088 t in 2001. This implies an increase in fishing effort oriented to Ling. From the above discussion it is inferred as necessary to limit fishing effort oriented to Ling particularly that exerted during the first quarter of the year around the reproductive area. Based on results from this and other reports, some proposals for management of the species starting from the year 2002 are indicated.
Evolución reciente de la captura por unidad de esfuerzo (1993-2004) y de las tallas medias (1993-2005) del pez palo (Percophis brasiliensis) en el litoral marítimo entre 34º S y 42º S
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Rico, María Rita; Perrotta, Ricardo G.
Brazilian flathead (Percophis brasiliensis), of wide latitudinal distribution (23° S-47° S), is caught in Argentina in two coastal areas north and south of the Province of Buenos Aires delimited by the 39° S latitude. The species shows the highest abundance and catch yield percentages ( 5. ) of all coastal fish groups. The importance of the species makes it necessary to analyze mean lengths and define an annual abundance index that would allow to diagnose the state of the stock. To calculate the index the General Linear Model was adjusted. The factors used were Year, Quarter and 4 sub-areas, all statistically significant. The problem generated by the presence in the model of first order interactions that include the Year factor is discussed. It is concluded that the catch per unit of effort series did not represent changes in the resource abundance. Results suggest that caution should be taken when using the values normally considered to diagnose the state of the stock and implement management measures. Based on catch and effort values, the most important sub-areas were the mouth of the Río de la Plata river (1) and the Mar del Plata adjacent areas (3). A decreasing trend of the mean length throughout the study period was also observed.
Inventario íctico del litoral costero bonaerense y uruguayo
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Ruarte, Claudio; Rico, María Rita; Lucifora, L.
The bibliography and the registries of fish caught in the Buenos Aires (Argentina) and Uruguay coastal littoral area during 33 research cruises were analyzed to elaborate the first ichthyic inventory of the region. A total of 147 species belonging to 71 families was registered. The figure represents 48% of the specimens reported for the Argentine-Uruguayan Common Fishing Zone and 37% of the marine species mentioned for the SW Atlantic. The list of coastal marine fishes of Uruguay and north of Argentina is the first attempt to provide basic information to evaluate possible temporal changes of the ichthyic composition in the area. The lists or inventories constitute an essential tool for fisheries management, the generation of statistic data and gathering of information useful for resource assessment.
Muestreo de desembarque de caballa (Scomber japonicus) en el puerto de Mar del Plata (38° S) y determinación de niveles de captura en el área El Rincón; período 1989-2003
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2007) Perrotta, Ricardo G.; Garciarena, A. David; Hernández, Daniel R.
Chub mackerel caught by the commercial fleet in El Rincón (39°-41° 30’ S) and Mar del Plata (38° S) areas was analyzed. In 2001 and 2002 samples from El Rincón were obtained from landings or collected by scientific observers on board the commercial ships. Samples from Mar del Plata were acquired during the 2001-2002 and 2002-2003 fishing seasons, on board two vessels of the small purse-seine fleet. Landings were mostly adults and only a small fraction of juveniles was observed (< 5%). Length growth parameters from El Rincón samples were estimated, and length-weight and length-age relationships were fitted by Least Squares. The results were as follows: L(mm) = 538.4; k (years-1) = 0.122; t0 (years) = -4.92; Pt = 4*10-7 * Lt 3.536. Natural mortality was estimated at 0.30 and age limit at 10 years. The standardized catch per unit effort (CPUE) annual mean (kg h-1) for the 1990-2002 period was calculated by means of a General Linear Model which justified 41% of total variance. The most significant variables resulted to be the seasonal pattern of exploitation of the resource (month), and its pronounced concentration in the exploitation area (fishing position). Values of the standardized CPUE annual mean fluctuated with trends that were similar to those registered between 1993 and 2002. Due to fluctuations in the Chub mackerel abundance and the possible negative effect caused by the activity of large ships in El Rincón, a maximum annual catch of 13,000 t for 2003 is suggested for this area as a precautionary measure.
Muestreo de desembarque de caballa (Scomber japonicus) en el puerto de Mar del Plata, período noviembre 2003-diciembre 2004 y resultados de la campaña de estimación de la biomasa de diciembre de 2004
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Perrotta, Ricardo G.; Garciarena, A. David; Madirolas, Adrián O.; Cabreira, Ariel G.
Chub mackerel (Scomber japonicus) landings corresponding to November 2003-January 2004 and November 2004-January 2005 fishing seasons were analyzed at the Mar del Plata port (Argentina, SW Atlantic). Fourty one samples were taken to measure total length exclusively and 4 sub-samples to record individual data (total length, weight, sex, sexual stage, age according to otoliths reading). Total length ranged 20-50 cm (1 and 8 years old). The most abundant sizes, between 32-37 cm, corresponded to ages 3 and 4, respectively. Most of the fish caught were adult (95%) and mature (85%) specimens. Length-weight, length-age relations were calculated and length-growth, weight-growth parameters estimated. The catch per unit of effort, of high variability (0-2,455 kg h-1), decreased as sea surface temperature increased. To estimate the species biomass in the fishing area a research cruise was carried out between 17-20 December 2004. Measurements, obtained with acoustic methods, reached a total of 11,678 t. The highest concentrations were found at a temperature of around 17.4 ºC and salinity of 33.62 psu. During the acoustic tracking, unusual concentrations of anchovy for the season were detected.
Observaciones sobre el comportamiento de la merluza (Merluccius hubbsi) durante la pesca de arrastre
(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2007) Casarsa, L.; Madirolas, Adrián O.
The normal behavioral patterns of several fish species is altered during trawling affecting the fish spatial distribution. Sonar methods were carried out in this research work in order to study the reaction of reproductive concentrations of the Argentine hake (Merluccius hubbsi) during mid-water and bottom fishing trawls. Observations made from a trawl sonar mounted on the headrope of an ENGEL (35 m) bottom trawl, showed that this species concentrates at the lower-central sector of the net mouth. During daytime trawls fish schools with a vertical distribution exceeding ten meters were observed entering the trawl within the first two meters from the bottom. Some observations during pelagic trawls carried out at night, showed no specific pattern at the net mouth. The observational method was efficient when fish densities were higher than 66,662 fish per nautical mile2, although it may only be considered as representative of the survey conditions, that is to say summer spawning concentrations of Argentine hake.

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