INFORME 159, FEBRUARY, 2001
PELAGIC RESOURCE EVALUATION CRUISE BICS JOSÉ OLAYA BALANDRA AND
SNP-2 001-02 FROM TACNA TO TUMBES.
DISTRIBUTION OF THE ELEVEN MOST ABUNDANT PERUVIAN MARINE FISHING RESOURCES
DURING THE SUMMER 2000.
CASTILLO, P. RAMIRO; MARIANO GUTIÉRREZ, SALVADOR PERALTILLA AND DORA MARÍN
The cruise was carried out from January 18th to February 29th 2000, from Tacna to Tumbes on board of the RVs José Olaya Balandra and the SNP-2 with the support of the LPs IMARPE IV and V. The distribution areas of eleven species were determined.
The Peruvian anchovy (Engraulis ringens), showed a wide distribution, along almost the whole littoral with important areas for its commercial capture, it was associated with the extension of Cold Coastal Waters and in front of Pacasmayo it was detected until 111nm offshore; in the area between Atico to Ilo, the distribution was coastal, due to the approach of the Superficial Subtropical Waters. The dense areas were located in front of Pimentel to Punta Lobos, Callao to Pucusana and Bahía Independencia.
The distribution of the sardine (Sardinops sagax sagax), was scarce and very dispersed. The jack mackerel (Trachurus murphyi) was found mainly beyond 20nm offshore, with its highest registrations in front of Callao, Tambo de Mora and Atico. The presence of mackerel (Scomber japonicus) was discontinuous, with the highest concentration areas between Lobos de Tierra island to Chimbote, in front of Bahía Independencia and in front of Quilca. The longnose anchovy (Anchoa nasus) distribution was very coastal with dense areas in Parachique, Punta La Negra, Callao, Cerro Azul, Tambo de Mora and Quilca. The lumptail searobin (Prionotus stephanophrys) and catfish (Galeichthys peruvianus), was detected in dispersed small coastal areas. The distribution of the camotillo (Normanichtys crockeri), was coastal, scarce and dispersed. The vinciguerria (Vinciguerria lucetia ) was detected with more abundance between Huarmey and Morro Sama, in areas far from the coast. The munida (Pleuroncodes monodon), was located from Pimentel to Morro Sama with dense nucleus among Chicama to Punta Lobos, Punta Bermejo to Huacho, Chancay to Pucusana, Pisco, Bahía Independencia, Chala, Ilo and Morro Sama. The giant squid (Dosidicus gigas), was in discontinuous areas all along the investigated area.
The equipment used was the scientific echosounder Simrad ED-500 (in RV Olaya) and the Simrad EY-500 (in RV SNP-2). The detection range was of 3.0 to 250m deep; in the case of RV SNP-2 the detection range was until 150m. The acoustic sampling was of 1 nm within parallel systematic tracks with a separation of 15nm for each profile. The total of 447 fishing casts confirmed the echo-registrations for each species. This distribution was determined by means of an interpolation data software.
BIOMASS OF THE ELEVEN MOST ABUNDANT FISHERY SPECIES IN THE PERUVIAN SEA
DURING THE SUMMER 2000.
CASTILLO, P. RAMIRO AND MARIANO GUTIÉRREZ
The biomass of eleven species of marine resources was assessed for the area between Tacna and Tumbes up to 111nm offshore, using hydroacoustic techniques. The species were Peruvian anchovy (Engraulis ringens, 9.439.340T+/-5.55%, its biggest abundance being at 7°-9°S; this increment as compared with previous cruises was caused by favorable environmental conditions); sardine (Sardinops sagax sagax, 53.135TN); jack mackerel (Trachurus murphyi, 702.236T); mackerel (Scomber japonicus, 368.898T). The jack mackerel and the mackerel presented a slight increase compared with the biomass estimated in November and December 1999, longnose anchovy (Anchoa nasus, 610.297T), and giant squid (Dosidicus gigas, 102.684T). The work was made from January 18th to February 29th 2000, on board of the RVs José Olaya Balandra and BIC SNP-2, with the support of the LP´s IMARPE IV and IMARPE V.
Acoustic data was obtained by parallel systematic design constituted of transects perpendicular to the Peruvian Coast separated by 15nm. The equipment used was the scientific echosounder SIMRAD EX500 and EY500, in a detection range of 3,0 to 250m of established depth in both vessels. The hydroacoustic calibrations were carried out at the beginning and end of the cruise near San Lorenzo and Lobos de Afuera islands, respectively. The biomass estimation was determined by the stratification method constituted of isoparalitoral areas. The target strength equations used for each species were the same ones determined in previous evaluation cruises.