Fishery resources and economic gain in three mangrove areas on the south‐east coast of India

Abstract

The fishery resources and fishing income in three different mangrove areas were evaluated. The mangrove‐rich area provided high catches of shellfish and finfish and yielded high fishery income, compared with the mangrove‐poor areas. Luxuriant mangrove areas supported a catch of 11 kg shellfish ha−1 day−1 and 4.5 kg finfish ha−1 day−1, corresponding with an economic gain of US$ 14 (Rs 603.7) day−1 for shellfish and US$ 3 (Rs 130.5) day−1 for finfish. The value of maintaining mangroves to ensure better fishery resources and to support coastal economies was identified. Management practices for conserving and enhancing mangroves and associated fishery resources are suggested.

Effects of different management regimes on mangrove ecosystem services in Java, Indonesia

“…We also note the strong link between food provision and the nursery service, both for aquaculture and wild fish harvest, as described in Table 6 and the sections on nursery service hereafter. The range in fish harvest numbers mentioned is a result of combining studies by Kathiresan and Rajendran (2002) and Gilbert and Janssen (1998), that all show similarities to our class of natural mangroves. Due to the large variability of mangrove age and corresponding tree size within conservation mangroves, we assume shrimp harvests to be lower than in protection forests vary strongly.…”

“…Quantitative information on fish and shrimp harvests in and around natural mangroves as presented in Table 6 is based on Gilbert and Janssen (1998), Kathiresan and Rajendran (2002), and Rönnbäck et al (2007). Although many studies exist that relate fish and shrimp availability to the presence of mangroves, most do not explicitly link them to management regimes.…”

“…Rönnbäck et al 2003). An extensive study by Kathiresan and Rajendran (2002), however indicated that with increasing species diversity of mangrove forests the amount of fish and shrimp harvested also went up due to higher "niche diversity". Although this is primarily a harvest indication, it can also be seen as an indication that the relative contribution of the nursery service is highest in forests with high mangrove species diversity.…”

“…Quantitative information on fish and shrimp harvests of low intensity use mangroves as compared to natural mangroves could be based on Gilbert and Janssen (1998), Kathiresan and Rajendran (2002) and Rönnbäck et al (2007). In comparsion to natural mangrove forests, fish harvests are similar, but especially shrimp harvest can be expected to drop to the lower ranges mentioned for conservation mangrove forests due to low species diversity and mangrove age (section 5.1).…”

“…In comparsion to natural mangrove forests, fish harvests are similar, but especially shrimp harvest can be expected to drop to the lower ranges mentioned for conservation mangrove forests due to low species diversity and mangrove age (section 5.1). However, differences are difficult to estimate because literature on shrimp harvests (Kathiresan and Rajendran 2002) and availability ) produce diverse and even contradicting statements. Kathiresan and Rajendran (2002) suggested that such differences were due to varying nursery function, food availability for juvenile shrimp and nutrient-rich waters.…”