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CRAMP Study Sites

Sectors: Haena -- Hanalei -- Na Pali -- Po‘ipū

Only one CRAMP site, Hanalei, has been established in the Hanalei sector.

Geographic Name: Hanalei Bay

CRAMP Site Code: KaHan

Geographic Coordinates:

22° 12.656’ N 159° 30.727’ W

Chart showing a portion of Hanalei Bay. Red arrows show location of transect sites.

Chart showing a portion of Hanalei Bay. Red arrows show location of transect sites. (Click image for larger view.)

Management Status: Open Access. Natural Heritage River status.

Area Description:

Watershed conservation land. Hanalei river drainage with valley taro cultivation. Shoreline residential/tourist development. White sand beach extends to shallow carbonate platform. Gradual slope to deeper areas with various reef structures. Diverse reef community. North exposed site. Heavily human use. Heavy freshwater input. Fish community has been well studied.

Reefs:

 

Photoquadrat from the Hanalei 3m site.

Photoquadrat from the Hanalei 8m site.

Hanalei Kaua‘i 3m

Total coral cover: 16.1% 

Species Richness: 9

Dominant Species: Montipora flabellata

Hanalei, Kaua‘i 8m

Total coral cover: 28.1% 

Species Richness: 7 

Dominant Species: Montipora patula

Photoquadrats from the Hanalei site.

Retrospective Analysis of Hanalei Fish Survey Data

Methodology

Visual fish censuses were conducted on twenty permanent 25 x 5 m transects previously established in Hanalei Bay in 1992 (Friedlander et al. 1997). Data collected in June 1999 were compared to surveys conducted on the same transects in June of 1993 and June of 1994. The fish assemblage characteristics showed very little change over the five-year period since the last survey was conducted with overall fish biomass increasing between 1994 and 1999 (Fig. 1).

Figure 1. Comparison of fish assemblage characteristics in Hanalei Bay for June 1993, 1994, and 1999.

Figure 1. Comparison of fish assemblage characteristics in Hanalei Bay for June 1993, 1994, and 1999. (Click image for larger view.)

The dominant species observed on Hanalei Bay transects during June of 1993, 1994, and 1999 appear in tables 1, 2, and 3. The endemic saddle wrasse (Thalassoma duperrey) and the introduced bluestripe snapper (Lutjanus kasmira) are the two most dominant species numerically in Hanalei Bay, although their order of dominance changes among years. All of the top ten species observed on transects in 1999 were also in the top ten in 1993 and 1994 except for the introduced blacktail snapper (Lutjanus fulvus) and the orangeband surgeonfish (Acanthurus olivaceus). The introduced blacktail snapper has increased in abundance in Hanalei Bay from being the 68 most dominant species (based on numerical IRD) in 1993, to 44 most dominant in 1994, to the fifth most dominant in 1999. Since the introduced bluestripe snapper is already the dominant species by weight in Hanalei Bay, the proliferation of another exotic snapper in the bay is cause for concern. These benthic carnivores have the potential to displace native species from preferred habitat, compete for valuable food resources, and can disrupt the integrity and balance of the overall ecological community.

Table 1: Relative abundance, frequency of occurrence and index of relative dominance (frequency occurrence x relative abundance) for the 10 most common fish species observed on transects in June 1993 in Hanalei Bay. Number of transects = 20. Species ordered by IRD.  (Click image for larger view.)

 

Table 1: Relative abundance, frequency of occurrence and index of relative dominance (frequency occurrence x relative abundance) for the 10 most common fish species observed on transects in June 1993 in Hanalei Bay. Number of transects = 20. Species ordered by IRD

Table 2: Relative abundance, frequency of occurrence and index of relative dominance (frequency occurrence x relative abundance) for the 10 most common fish species observed on transects in June 1994 in Hanalei Bay. Number of transects = 20. Species ordered by IRD.  (Click image for larger view.)

Table 2: Relative abundance, frequency of occurrence and index of relative dominance (frequency occurrence x relative abundance) for the 10 most common fish species observed on transects in June 1994 in Hanalei Bay. Number of transects = 20. Species ordered by IRD.

Table 3: Relative abundance, frequency of occurrence and index of relative dominance (frequency occurrence x relative abundance) for the 10 most common fish species observed on transects in June 1999 in Hanalei Bay. Number of transects = 20. Species ordered by IRD.  (Click image for larger view.)

Table 3: Relative abundance, frequency of occurrence and index of relative dominance (frequency occurrence x relative abundance) for the 10 most common fish species observed on transects in June 1999 in Hanalei Bay. Number of transects = 20. Species ordered by IRD.

Aerial Images of Hanalei Bay

Study Site Summary of Results

 

 

Last Update: 02/23/2011

By: Dan Lager

Hawai‘i  Coral Reef Assessment & Monitoring Program

Hawai‘i  Institute of Marine Biology

P.O. Box 1346

Kāne‘ohe, HI 96744

808-236-7440 phone

808-236-7443 fax

email: jokiel@hawaii.edu