Gonadal Development of Peprilus medius (Peters, 1869) (Perciformes: Stromateidae) from Southeast of the Gulf of California, Mexico

Abstract

1 MALDONADO-AMPARO, M. A.; SÁNCHEZ-CÁRDENAS, R.; SALCIDO-GUEVARA, L.A. & RAMÍREZ-PÉREZ, J. S.Gonadal development of Peprilus medius (Peters, 1869) (Perciformes: Stromateidae) from southeast of the Gulf of California, Mexico. Int. J. Morphol., 35(1):56-61, 2017. SUMMARY:The gonadal development assessment is a fundamental work in researching the reproduction of Peprilus medius, on the way to understand its population dynamics and to achieve a sustainable management of its fisheries. The diagnosis based on morphochromatic features is the quicker, more practical and cheaper method, and properly validated, it may be an accurate procedure. This is particularly useful in researches when it is required to provide prompt and accurate information to support decision-making for fisheries management, and during long-term fisheries monitoring to detect changes in reproductive patterns due to environmental anomalies. These are issues of concern in P. medius and other fishery resources. In this context, a scale that describes the gonadal development through morphochromatic and histological features is presented, and plus anatomical observations of the reproductive organs. Ovarian development was characterized through six phases: immature, development (sub-phases: early and late), mature, spawning (sub-phases: partial and partial post-spawning), post-spawning and resting. Testicular development was described through five phases: immature, development, ejaculation, ejaculated and resting. The position and shape of the reproductive organs are apparently defined by the shape of the fish and the visceral cavity. P. medius's gonads show a gonadal lobe at lower position and an upper lobe in the visceral cavity, and both lobes presented a horizontal placement from gonopore toward the back of the fish. In addition, gonadal deformities occurrence due to deformities in the visceral cavity was evidenced. We recommend to use presented descriptions as a guide in gonadal assessment.

Abundancia, biomasa y estructura de la ictiofauna demersal en el océano Pacífico de Centroamérica, basadas en datos de prospección pesquera realizados a bordo del B/O Miguel Oliver

“…Peprilus medius es una especie de alto interés comercial en pesquerías costeras en el golfo de California, México (Maldonado-Amparo et al 2017) y fue, junto con su congénero P. snyderi y M. angustinanus, importante contribuidora de la biomasa total en el presente estudio. En el nivel de familias, Macrouridae (10), Sciaenidae (8) y Serranidae (8) destacan en cuanto a diversidad de especies, todas con representantes conocidos de relevancia ecológica y económica.…”

“…Existen diversos estudios en esta gran región que abordan la dinámica costera (Trasviña & Barton, 2008), la oceanografía regional ), los procesos de interacción océano-atmósfera (Amador et al 2016), los eventos climatológicos (Maldonado et al 2018) y la biogeografía de especies de peces en ambientes coralinos (Zapata & Robertson, 2007;Robertson & Cramer, 2009). Los trabajos de peces asociados a la plataforma continental se han concentrado en la costa pacífica Rev.…”

Reproductive dynamics of Peprilus medius captured in the Ecuadorian Pacific

“…The specimens were measured for total length (TL), with a digital ichthyometer with a precision of 1 mm, total weight (TW), the weight of the gonads (GW), and the weight of the liver (LiW), with a digital scale with a precision of 0.01 g. Sex and gonadal maturity stages were characterized according to the gonadal maturity scale of Maldonado-Amparo et al (2017).…”

“…In countries of the region, such as Mexico, Colombia, and Peru, P. medius represents a fishery very similar to that of Ecuador in terms of capture and consumption (Inga-Barreto et al 2008, Moreira-Arcentales 2012, Martínez-Muñoz et al 2015, Reyes-Lucas & Reyes-Vega 2015, Maldonado-Amparo et al 2019. It also generates an important item for the fishing communities' economies.…”

“…In the region, there is little information on the biology of this species. Some studies that can be highlighted are those on the size-weight relationship and gonadal development in the southeastern Gulf of California, Mexico (Maldonado-Amparo et al 2017, the influence of size and sex of P. medius on its parasite community (Iannacone & Alvariño 2008), and population parameters of P. medius in the Tumbes region, Peru (Vera et al 2006). At the same time, there is historical information regarding catches published in technical reports and bulletins of government fisheries research institutions such as the Peruvian Institute of the Sea (IMARPE, by its Spanish acronym) and the Public Institute for Aquaculture and Fisheries Research (IPIAP, by its Spanish acronym) in Ecuador.…”