Analysis of the fishery and population dynamics of the atlantic thread herring (Opisthonema oglinum) in Yucatán, Mexico

High rates of undersized catch and discard mortality are common in fisheries for Red Grouper Epinephelus morio in the Gulf of Mexico and Atlantic Ocean. Reducing undersized catch rate in these fisheries requires more effective regulation of the minimum size limit (MSL). One potential method is to regulate hook selectivity for target species. Three circle hook sizes (11/0, 12/0, and 13/0) were tested to assess the effect of hook size on Red Grouper catch rate and size in the shallow waters of the Yucatan Peninsula coast, which is the primary fishing zone for the region's small‐scale grouper (family Epinephelidae) fishery. Red Grouper was always the numerically dominant species in catches (76–81%) for all hook sizes. Hook size did not affect mean catch rate. Significantly longer fish were caught in the 13/0 hook size treatment than in the 11/0 and 12/0 treatments, which did not differ. Nonetheless, when considering the MSL regulation applicable in Mexico's Red Grouper fishery (36.3 cm TL), high percentages of undersized Red Grouper were still caught, regardless of hook size. The hook sizes required in the Yucatan small‐scale fishery (10/0–12/0) provide little if any improvement in Red Grouper MSL regulation. Real improvement would require the effective release of undersized fish as well as a reduction in the number of undersized specimens caught and in potential cryptic sources of fish release mortality (e.g., barometric trauma). Furthermore, the current applicable Red Grouper MSL only really attempts to control growth overfishing and ignores recruitment overfishing. Received December 22, 2014; accepted September 3, 2015

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Otolith microstructure analysis with OTC validation confirms age overestimation in Atlantic thread herring Opisthonema oglinum from north‐eastern Brazil

Lessa

Duarte‐Neto

Morize

et al. 2008

Journal of Fish Biology

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The daily periodicity of micro-increments in the otoliths of Atlantic thread herring Opisthonema oglinum was demonstrated from juveniles injected with oxytetracycline and reared for up to 62 days. Micro-increments ranged from 26 to 358 in the overall sample. Von Bertalanffy growth function (VBGF) using micro-increment counts were:. The otolith-based growth was corroborated using the L F frequency analysis. Observed lengths of increments were considered unsuitable for VBGF derivation, as no increase in size was obtained from them. Furthermore, the high percentage of unreadable otoliths suggests that increment analysis is unreliable for age estimation. Most growth occurs within the first year, differing from previous longevity estimates of 4-8 years. In contrast with published information, O. oglinum is a fast-growing and shortlived species.

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Analysis of the fishery and population dynamics of the atlantic thread herring (Opisthonema oglinum) in Yucatán, Mexico

Cited by 4 publications

References 1 publication

A Preliminary Trophic Model of the Continental Shelf, South-western Gulf of Mexico

A Preliminary Trophic Model of the Continental Shelf, South-western Gulf of Mexico

Influence of Circle Hook Size on Catch Rate and Size of Red Grouper in Shallow Waters of the Southern Gulf of Mexico

Otolith microstructure analysis with OTC validation confirms age overestimation in Atlantic thread herring Opisthonema oglinum from north‐eastern Brazil

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